【C#】分享一个可携带附加消息的增强消息框MessageBoxEx

--------------201806111122更新---------------

 更新至2.0。主要是增加自定义按钮文本的功能,另项目已放到https://github.com/ahdung/MessageBoxEx,欢迎f**k

--------------201507160917更新---------------

  • 无意中发现标准消息框在Windows7是有声音的,只是在Windows server 2008(R2)无声,而我用的刚好是后者,所以误以为是MessageBeep API在所有NT6系统都不工作造成~汗,有人在stackoverflow也提过这问题。但我仍然决定使用PlaySound API,不做修改
  • 将声音处理交给ProcessIcon方法负责。之前考虑松耦合,所以将MessageBoxIcon和声音分开处理,但其实声音就是根据前者而来,两者天然就是耦合的,分开处理多此一举

--------------201507091034更新---------------

首先感谢猿友E204在回复中的反馈。

  • 解决双击【详细信息】按钮造成的Checked状态改变问题,办法是让ToggleButton忽略WM_LBUTTONDBLCLK消息
  • 修正收起详细信息区逻辑,改为直接取用plAttachZone.Height。之前是取ExpandHeight,会造成视觉体验问题

--------------201507082014原文(已更新)---------------

适用于:.net 2.0+的Winform项目

样子:

有损录制+制图的原因不可能原样展示出真实效果,可至文章结尾下载Demo体验。

功能和特点:

  • 相对父窗体居中
  • 可附带附加消息。附加消息可以是string和Exception类型,【详细信息】按钮会根据是否传入附加信息显示和隐藏。传入Exception实例时,呈现的是exception.ToString(),也就是可能携带StackTrace信息,所以如果你只是想呈现异常文本,还是老实传入ex.Message
  • 展开/收起附加信息时有动画效果。实用为王的你亦可设置EnableAnimate=false关闭动画效果
  • 在Windows Server 2008 R2(未测试其它服务器系统)也有声音反馈。标准消息框在个人系统(XP/Win7等)是有声音的,但在srv08却没有。同时亦提供了EnableSound属性允许你关闭声音反馈
  • 移除了标准MessageBox提供的IWin32Window、MessageBoxOptions和Help相关参数,原因是我用不到,懒得实现
  • 可拖拉改变消息框尺寸,消息文本和附加文本会随窗体大小重排。这是标准消息框未提供的能力。改变尺寸分两种情况有不同的行为:①详细信息未展开时,改变的是主消息区大小;②详细信息展开时,改变的是详细信息区的大小

总体来说,此消息框比较适合用在需要反馈大量消息文本的场合,用标准消息框的话,文本太多可能会使消息框超出屏幕大小,比如codeproject.com上这位老兄举的例子,由于标准消息框不具备改变窗体大小的能力,将导致部分消息无法让用户看到。而就算没有超出屏幕,一下子让用户面对那么多消息文字,体验也不地道。使用本消息框就可以解决此类问题,比如可以将扼要信息显示在主消息区,将大量的明细消息(例如批量处理中的单项处理情况)、次要消息、异常信息等放置在详细信息区,由用户或IT支持人员自己去展开获取这些信息。同时,在没有附加消息的时候,你仍然可以像标准消息框一样使用它,所以,如果你跟我一样不会用到标准消息框的IWin32Window、MessageBoxOptions和Help相关参数的话,基本上你可以在整个项目中全程用此消息框替换掉标准消息框,别忘了相比标准消息框,它还具备了可缩放、相对父窗体居中等额外能力。总言之,你值得拥有。至于如果你担心性能问题,这个~我想这么说,我对自己的代码质量还是有点信心的。也希望能得大侠指出槽点,感激!

使用说明:

先看公开成员:

//静态属性
MessageBoxEx.EnableAnimate
MessageBoxEx.EnableSound

//静态方法
MessageBoxEx.Show(string, string, string)
MessageBoxEx.Show(string, string, string, MessageBoxButtons)
MessageBoxEx.Show(string, string, string, MessageBoxButtons, MessageBoxIcon)
MessageBoxEx.Show(string, string, string, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)

MessageBoxEx.Show(string, string, Exception)
MessageBoxEx.Show(string, string, Exception, MessageBoxButtons)
MessageBoxEx.Show(string, string, Exception, MessageBoxButtons, MessageBoxIcon)
MessageBoxEx.Show(string, string, Exception, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)
  • 属性EnableAnimate和EnableSound上面提过,分别是用来启用/关闭动画、声音效果的,默认是都启用。俩属性影响范围是全局的,比如设置EnableAnimate = false后,之后弹出的MessageBoxEx都没有动画效果,直到重新设为true,EnableSound亦然。最佳实践是将它俩与用户偏好设置相关联,允许用户自主控制
  • 方法则只有一个:Show(),从重载列表你大概都能知道如何使用。其中第3个参数就是附加消息,可接受string和Exception类的实例,其余参数的位置和意义与标准消息框一致。简要示例如下:
MessageBoxEx.Show("主消息", "标题", "附加消息", MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
MessageBoxEx.Show("主消息", "标题", ex, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
  • 前3个参数可以放心为null,内部有处理,后面的枚举你也null不了,如果传入无效枚举值,会抛异常
  • 只有3个string参数的那个方法,后面俩参数是可选的。所以不讲究消息体验的你仍然可以这样使用:
MessageBoxEx.Show("阿斯顿发");
MessageBoxEx.Show("阿斯顿发", "士大夫");

方案源码:

代码不少,原因自然是有的,有兴趣的童鞋请看后面的实现说明。另外,千万不要认为代码量跟性能有直接关系,有时候更多的代码恰恰是为了提升性能而存在,有时候则是为了健壮性。

using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;

namespace AhDung.WinForm
{
    /// <summary>
    /// 可以携带详细信息的消息框
    /// </summary>
    public static class MessageBoxEx
    {
        //异常消息文本
        private const string InvalidButtonExString = "按钮参数不是有效的枚举项!";
        private const string InvalidIconExString = "图标参数不是有效的枚举项!";
        private const string InvalidDfButtonExString = "默认按钮参数不是有效的枚举项!";

        /// <summary>
        /// 是否启用动画效果
        /// </summary>
        public static bool EnableAnimate { get; set; }

        /// <summary>
        /// 是否启用声音反馈
        /// </summary>
        public static bool EnableSound { get; set; }

        //静态构造
        static MessageBoxEx()
        {
            //默认启用动画+声音
            EnableAnimate = true;
            EnableSound = true;
        }

        #region 公开方法

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="attachMessage">附加消息</param>
        public static DialogResult Show(string message, string caption = null, string attachMessage = null)
        {
            return ShowCore(message, caption, attachMessage, MessageBoxButtons.OK, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
        }

        /*下面这仨弄成重载而不是可选方法是为了避免不必要的参数检查*/

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="attachMessage">附加消息</param>
        /// <param name="buttons">按钮组合</param>
        public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons)
        {
            if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); }

            return ShowCore(message, caption, attachMessage, buttons, MessageBoxIcon.None, MessageBoxDefaultButton.Button1);
        }

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="attachMessage">附加消息</param>
        /// <param name="buttons">按钮组合</param>
        /// <param name="icon">图标</param>
        public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon)
        {
            if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); }
            if (!Enum.IsDefined(typeof(MessageBoxIcon), icon)) { throw new InvalidEnumArgumentException(InvalidIconExString); }

            return ShowCore(message, caption, attachMessage, buttons, icon, MessageBoxDefaultButton.Button1);
        }

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="attachMessage">附加消息</param>
        /// <param name="buttons">按钮组合</param>
        /// <param name="icon">图标</param>
        /// <param name="defaultButton">默认按钮</param>
        public static DialogResult Show(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
        {
            if (!Enum.IsDefined(typeof(MessageBoxButtons), buttons)) { throw new InvalidEnumArgumentException(InvalidButtonExString); }
            if (!Enum.IsDefined(typeof(MessageBoxIcon), icon)) { throw new InvalidEnumArgumentException(InvalidIconExString); }
            if (!Enum.IsDefined(typeof(MessageBoxDefaultButton), defaultButton)) { throw new InvalidEnumArgumentException(InvalidDfButtonExString); }

            return ShowCore(message, caption, attachMessage, buttons, icon, defaultButton);
        }

        /********传入异常的重载********/

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="exception">异常实例</param>
        public static DialogResult Show(string message, string caption, Exception exception)
        {
            return Show(message, caption, exception == null ? string.Empty : exception.ToString());
        }

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="exception">异常实例</param>
        /// <param name="buttons">按钮组合</param>
        public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons)
        {
            return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons);
        }

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="exception">异常实例</param>
        /// <param name="buttons">按钮组合</param>
        /// <param name="icon">图标</param>
        public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons, MessageBoxIcon icon)
        {
            return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons, icon);
        }

        /// <summary>
        /// 显示消息框
        /// </summary>
        /// <param name="message">消息文本</param>
        /// <param name="caption">消息框标题</param>
        /// <param name="exception">异常实例</param>
        /// <param name="buttons">按钮组合</param>
        /// <param name="icon">图标</param>
        /// <param name="defaultButton">默认按钮</param>
        public static DialogResult Show(string message, string caption, Exception exception, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
        {
            return Show(message, caption, exception == null ? string.Empty : exception.ToString(), buttons, icon, defaultButton);
        }

        #endregion

        //内部方法,不检查参数有效性
        private static DialogResult ShowCore(string message, string caption, string attachMessage, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
        {
            using (MessageForm f = new MessageForm(message, caption, buttons, icon, defaultButton, attachMessage, EnableAnimate, EnableSound))
            {
                return f.ShowDialog();
            }
        }


        /*----------------
         下面是消息窗体相关
         ---------------*/

        /// <summary>
        /// 消息窗体
        /// </summary>
        /// <remarks>参数有效性由MessageBoxEx负责</remarks>
        private class MessageForm : Form
        {
            /* todo 存在问题:
             * 当消息区文本非常非常多时,且反复进行改变消息框窗口大小、位置、展开收起的操作,那么在某次展开时
               详细信息文本框可能会在原位置(即消息区内某rect)瞬闪一下,
               原因是文本框控件在显示时总会在原位置WM_NCPAINT + WM_ERASEBKGND一下,暂无解决办法。
               实际应用中碰到的几率很小,就算碰到,影响也可以忽略。
             */

            #region 控件初始化

            /// <summary>
            /// 必需的设计器变量。
            /// </summary>
            private System.ComponentModel.IContainer components = null;

            /// <summary>
            /// 清理所有正在使用的资源。
            /// </summary>
            /// <param name="disposing">如果应释放托管资源,为 true;否则为 false。</param>
            protected override void Dispose(bool disposing)
            {
                if (disposing && (components != null))
                {
                    components.Dispose();
                }
                base.Dispose(disposing);
            }

            #region Windows 窗体设计器生成的代码

            /// <summary>
            /// 设计器支持所需的方法 - 不要
            /// 使用代码编辑器修改此方法的内容。
            /// </summary>
            private void InitializeComponent()
            {
                this.button3 = new System.Windows.Forms.Button();
                this.txbAttach = new TextBoxUnSelectAllable();
                this.button2 = new System.Windows.Forms.Button();
                this.button1 = new System.Windows.Forms.Button();
                this.plButtonsZone = new AhDung.WinForm.MessageBoxEx.MessageForm.PanelBasic();
                this.ckbToggle = new AhDung.WinForm.MessageBoxEx.MessageForm.ToggleButton(this.UseAnimate);
                this.plAttachZone = new AhDung.WinForm.MessageBoxEx.MessageForm.PanelBasic();
                this.lbMsg = new AhDung.WinForm.MessageBoxEx.MessageForm.MessageViewer();
                this.plButtonsZone.SuspendLayout();
                this.plAttachZone.SuspendLayout();
                this.SuspendLayout();
                // 
                // button3
                // 
                this.button3.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
                this.button3.Location = new System.Drawing.Point(320, 8);
                this.button3.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
                this.button3.Name = "button3";
                this.button3.Size = new System.Drawing.Size(85, 27);
                this.button3.TabIndex = 2;
                // 
                // txbAttach
                // 
                this.txbAttach.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                                         | System.Windows.Forms.AnchorStyles.Left)
                                         | System.Windows.Forms.AnchorStyles.Right;
                this.txbAttach.Location = new System.Drawing.Point(10, 7);
                this.txbAttach.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1);
                this.txbAttach.Name = "txbAttach";
                this.txbAttach.ReadOnly = true;
                this.txbAttach.Multiline = true;
                this.txbAttach.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
                this.txbAttach.Size = new System.Drawing.Size(395, 105);
                this.txbAttach.TabIndex = 0;
                // 
                // button2
                // 
                this.button2.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
                this.button2.Location = new System.Drawing.Point(229, 8);
                this.button2.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
                this.button2.Name = "button2";
                this.button2.Size = new System.Drawing.Size(85, 27);
                this.button2.TabIndex = 1;
                // 
                // button1
                // 
                this.button1.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
                this.button1.Location = new System.Drawing.Point(138, 8);
                this.button1.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
                this.button1.Name = "button1";
                this.button1.Size = new System.Drawing.Size(85, 27);
                this.button1.TabIndex = 0;
                // 
                // plButtonsZone
                // 
                this.plButtonsZone.Controls.Add(this.ckbToggle);
                this.plButtonsZone.Controls.Add(this.button1);
                this.plButtonsZone.Controls.Add(this.button2);
                this.plButtonsZone.Controls.Add(this.button3);
                this.plButtonsZone.Dock = System.Windows.Forms.DockStyle.Bottom;
                this.plButtonsZone.Location = new System.Drawing.Point(0, 96);
                this.plButtonsZone.Margin = new System.Windows.Forms.Padding(3, 1, 3, 1);
                this.plButtonsZone.Name = "plButtonsZone";
                this.plButtonsZone.Size = new System.Drawing.Size(415, 36);
                this.plButtonsZone.TabIndex = 1;
                // 
                // ckbToggle
                // 
                this.ckbToggle.Location = new System.Drawing.Point(10, 8);
                this.ckbToggle.Name = "ckbToggle";
                this.ckbToggle.Size = new System.Drawing.Size(93, 27);
                this.ckbToggle.TabIndex = 3;
                this.ckbToggle.Text = "详细信息(&D)";
                this.ckbToggle.CheckedChanged += this.ckbToggle_CheckedChanged;
                // 
                // plAttachZone
                // 
                this.plAttachZone.Controls.Add(this.txbAttach);
                this.plAttachZone.Dock = System.Windows.Forms.DockStyle.Fill;
                this.plAttachZone.Location = new System.Drawing.Point(0, 130);
                this.plAttachZone.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
                this.plAttachZone.Name = "plAttachZone";
                this.plAttachZone.Size = new System.Drawing.Size(415, 114);
                this.plAttachZone.TabIndex = 2;
                this.plAttachZone.Visible = false;
                // 
                // lbMsg
                // 
                this.lbMsg.Dock = System.Windows.Forms.DockStyle.Fill;
                this.lbMsg.Icon = null;
                this.lbMsg.Location = new System.Drawing.Point(0, 0);
                this.lbMsg.Name = "lbMsg";
                this.lbMsg.Padding = new System.Windows.Forms.Padding(21, 18, 21, 18);
                //this.lbMsg.Size = new System.Drawing.Size(415, 96);
                this.lbMsg.TabIndex = 0;
                // 
                // FmMsg
                // 
                this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
                //this.ClientSize = new System.Drawing.Size(415, 261);
                this.Controls.Add(this.lbMsg);
                this.Controls.Add(this.plButtonsZone);
                this.Controls.Add(this.plAttachZone);
                this.DoubleBuffered = true;
                this.MaximizeBox = false;
                this.Name = "MessageForm";
                this.Padding = new System.Windows.Forms.Padding(0, 0, 0, 17);
                this.ShowIcon = false;
                this.ShowInTaskbar = false;
                this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Show;
                this.plButtonsZone.ResumeLayout(false);
                this.plAttachZone.ResumeLayout(false);
                this.plAttachZone.PerformLayout();
                this.ResumeLayout(false);
            }

            #endregion

            private ToggleButton ckbToggle;
            private TextBoxUnSelectAllable txbAttach;
            private MessageViewer lbMsg;
            private System.Windows.Forms.Button button2;
            private System.Windows.Forms.Button button1;
            private PanelBasic plButtonsZone;
            private PanelBasic plAttachZone;
            private System.Windows.Forms.Button button3;

            #endregion

            /// <summary>
            /// 最大默认窗体客户区宽度
            /// </summary>
            const int MaxClientWidth = 700;

            string messageSound;//存储供PlaySound API使用的系统消息音别名,在ProcessIcon中赋值,OnShown中取用

            int expandHeight;
            /// <summary>
            /// 详细信息区展开高度
            /// </summary>
            private int ExpandHeight
            {
                get { return expandHeight < 150 ? 150 : expandHeight; }
                set { expandHeight = value; }
            }

            #region 属性

            /// <summary>
            /// 是否启用动画效果
            /// </summary>
            /// <remarks>此处还弄该属性是为了保证窗体类的独立性</remarks>
            private bool UseAnimate { get; set; }

            /// <summary>
            /// 是否启用声音反馈
            /// </summary>
            /// <remarks>此处还弄该属性是为了保证窗体类的独立性</remarks>
            private bool UseSound { get; set; }

            /// <summary>
            /// 消息按钮
            /// </summary>
            private MessageBoxButtons MessageButtons { get; set; }

            /// <summary>
            /// 消息图标
            /// </summary>
            private MessageBoxIcon MessageIcon { get; set; }

            /// <summary>
            /// 默认按钮
            /// </summary>
            private MessageBoxDefaultButton DefaultButton { get; set; }

            #endregion

            /// <summary>
            /// 创建消息窗体
            /// </summary>
            private MessageForm(bool enableAnimate)
            {
                this.UseAnimate = enableAnimate;//须尽早设置,要供展开按钮初始化用
                InitializeComponent();
                this.StartPosition = Form.ActiveForm == null ? FormStartPosition.CenterScreen : FormStartPosition.CenterParent;
                this.Font = SystemFonts.MessageBoxFont;

                //注册事件
                this.button1.Click += button_Click;
                this.button2.Click += button_Click;
                this.button3.Click += button_Click;
                this.plAttachZone.Resize += plAttachZone_Resize;
            }

            /// <summary>
            /// 创建消息窗体
            /// </summary>
            public MessageForm(string message, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, string attachMessage, bool enableAnimate, bool enableSound)
                : this(enableAnimate)
            {
                this.lbMsg.Text = message;
                this.Text = caption;
                this.txbAttach.Text = attachMessage;
                this.MessageButtons = buttons;
                this.MessageIcon = icon;
                this.DefaultButton = defaultButton;
                this.UseSound = enableSound;
            }

            #region 重写基类方法

            protected override void OnLoad(EventArgs e)
            {
                //须在计算各种尺寸前搞掂
                ProcessIcon();
                ProcessButtons();

                this.MinimumSize = SizeFromClientSize(new Size(GetPanelButtonMinWidth(), GetClientMinHeight()));

                //参数意义定为客户区最大大小,所以需刨掉非客户区高度后传入
                this.ClientSize = this.GetPreferredSize(new Size(MaxClientWidth, Screen.PrimaryScreen.WorkingArea.Height - (this.Height - this.ClientSize.Height)));

                base.OnLoad(e);
            }

            protected override void OnShown(EventArgs e)
            {
                //设置默认按钮焦点。须在OnShown中设置按钮焦点才有用
                Button dfBtn;
                if ((dfBtn = this.AcceptButton as Button) != null)
                {
                    dfBtn.Focus();
                }

                //播放消息提示音
                if (this.UseSound) { PlaySystemSound(this.messageSound); }

                base.OnShown(e);
            }

            //重写窗体参数
            protected override CreateParams CreateParams
            {
                get
                {
                    CreateParams prms = base.CreateParams;

                    if ((Convert.ToInt32(this.MessageButtons) & 1) == 0) //没有Cancel按钮时屏蔽关闭按钮,刚好在偶数项
                    {
                        prms.ClassStyle |= 0x200;
                    }

                    return prms;
                }
            }

            /// <summary>
            /// 计算合适的窗口尺寸
            /// </summary>
            /// <param name="proposedSize">该参数此处定义为客户区可设置的最大尺寸</param>
            public override Size GetPreferredSize(Size proposedSize)
            {
                int reservedHeight = plButtonsZone.Height + Padding.Bottom;
                Size size = lbMsg.GetPreferredSize(new Size(proposedSize.Width, proposedSize.Height - reservedHeight));
                size.Height += reservedHeight;
                return size;
            }

            #endregion

            #region 事件处理方法

            //展开收起
            private void ckbToggle_CheckedChanged(object sender, EventArgs e)
            {
                this.SuspendLayout();

                if (ckbToggle.Checked)
                {
                    plButtonsZone.SendToBack();
                    lbMsg.SendToBack();

                    lbMsg.Dock = DockStyle.Top;
                    plButtonsZone.Dock = DockStyle.Top;

                    ChangeFormHeight(ExpandHeight);
                    plAttachZone.Visible = true;
                }
                else
                {
                    ExpandHeight = plAttachZone.Height;//为再次展开记忆高度
                    plAttachZone.Visible = false;
                    ChangeFormHeight(-plAttachZone.Height);//收起时直接取pl高度,不要取ExpandHeight

                    plButtonsZone.SendToBack();

                    plButtonsZone.Dock = DockStyle.Bottom;
                    lbMsg.Dock = DockStyle.Fill;
                }

                this.ResumeLayout();
            }

            //按钮事件
            private void button_Click(object sender, EventArgs e)
            {
                this.DialogResult = (DialogResult)((sender as Button).Tag);
            }

            //用户手工收完详细区则触发折叠
            private void plAttachZone_Resize(object sender, EventArgs e)
            {
                if (ckbToggle.Checked && plAttachZone.Height == 0)
                {
                    ckbToggle.Checked = false;
                }
            }

            #endregion

            #region 辅助+私有方法

            /// <summary>
            /// 处理按钮相关
            /// </summary>
            private void ProcessButtons()
            {
                this.ckbToggle.Visible = txbAttach.Text.Trim().Length != 0; //无详细信息就不显示展开按钮

                int btnCount = 3; //按钮数量

                switch (MessageButtons) //老实用case,可读点
                {
                    case MessageBoxButtons.AbortRetryIgnore:
                        button1.Text = "中止(&A)"; button1.Tag = DialogResult.Abort;
                        button2.Text = "重试(&R)"; button2.Tag = DialogResult.Retry;
                        button3.Text = "忽略(&I)"; button3.Tag = DialogResult.Ignore;
                        break;
                    case MessageBoxButtons.OK:
                        button1.Visible = false;
                        button2.Visible = false;
                        button3.Text = "确定"; button3.Tag = DialogResult.OK;
                        btnCount = 1;
                        break;
                    case MessageBoxButtons.OKCancel:
                        button1.Visible = false;
                        button2.Text = "确定"; button2.Tag = DialogResult.OK;
                        button3.Text = "取消"; button3.Tag = DialogResult.Cancel;
                        btnCount = 2;
                        break;
                    case MessageBoxButtons.RetryCancel:
                        button1.Visible = false;
                        button2.Text = "重试(&R)"; button2.Tag = DialogResult.Retry;
                        button3.Text = "取消"; button3.Tag = DialogResult.Cancel;
                        btnCount = 2;
                        break;
                    case MessageBoxButtons.YesNo:
                        button1.Visible = false;
                        button2.Text = "是(&Y)"; button2.Tag = DialogResult.Yes;
                        button3.Text = "否(&N)"; button3.Tag = DialogResult.No;
                        btnCount = 2;
                        break;
                    case MessageBoxButtons.YesNoCancel:
                        button1.Text = "是(&Y)"; button1.Tag = DialogResult.Yes;
                        button2.Text = "否(&N)"; button2.Tag = DialogResult.No;
                        button3.Text = "取消"; button3.Tag = DialogResult.Cancel;
                        break;
                    default: break;
                }

                //仅有OK和有取消按钮时设CancelButton
                if ((int)MessageButtons == 0 || ((int)MessageButtons & 1) == 1)
                {
                    this.CancelButton = button3;
                }

                //处理默认按钮
                if (btnCount == 1)
                {
                    this.AcceptButton = button3;
                }
                else if (btnCount == 2)
                {
                    this.AcceptButton = DefaultButton == MessageBoxDefaultButton.Button2 ? button3 : button2;
                }
                else
                {
                    Button[] btnArray = { button1, button2, button3 };
                    this.AcceptButton = btnArray[Convert.ToInt32(DefaultButton) / 0x100];
                }
            }

            /// <summary>
            /// 处理图标(含声音)
            /// </summary>
            private void ProcessIcon()
            {
                switch (MessageIcon)
                {
                    //MessageBoxIcon.Information同样
                    case MessageBoxIcon.Asterisk:
                        lbMsg.Icon = SystemIcons.Information;
                        messageSound = "SystemAsterisk";
                        break;

                    //MessageBoxIcon.Hand、MessageBoxIcon.Stop同样
                    case MessageBoxIcon.Error:
                        lbMsg.Icon = SystemIcons.Error;
                        messageSound = "SystemHand";
                        break;

                    //MessageBoxIcon.Warning同样
                    case MessageBoxIcon.Exclamation:
                        lbMsg.Icon = SystemIcons.Warning;
                        messageSound = "SystemExclamation";
                        break;

                    case MessageBoxIcon.Question:
                        lbMsg.Icon = SystemIcons.Question;
                        messageSound = "SystemAsterisk";//Question原本是没声音的,此实现让它蹭一下Information的
                        break;

                    default: //MessageBoxIcon.None
                        lbMsg.Icon = null;
                        messageSound = "SystemDefault";
                        break;
                }
            }

            /// <summary>
            /// 计算窗体客户区最小高度
            /// </summary>
            private int GetClientMinHeight()
            {
                return lbMsg.MinimumHeight + plButtonsZone.Height + Padding.Bottom;
            }

            /// <summary>
            /// 计算按钮区最小宽度
            /// </summary>
            private int GetPanelButtonMinWidth()
            {
                int r = 20 /*左右Padding*/, visibleCount = -1 /*因为两个以上才会有间距*/;

                if (ckbToggle.Visible) { r += ckbToggle.Width; visibleCount++; }
                if (button1.Visible) { r += button1.Width * 3; visibleCount += 3; }
                else if (button2.Visible) { r += button2.Width * 2; visibleCount += 2; }
                else { r += button3.Width; visibleCount++; }

                if (visibleCount != -1) { r += visibleCount * 6; } //按钮间距

                return r;
            }

            /// <summary>
            /// 改变窗体高度。内部有动画处理
            /// </summary>
            /// <param name="increment">增量(负数即为减小高度)</param>
            private void ChangeFormHeight(int increment)
            {
                int finalHeight = this.Height + increment; //正确的目标高度

                if (!this.UseAnimate) //不使用动画
                {
                    this.Height = finalHeight;
                    return;
                }

                const int step = 8; //帧数

                for (int i = 0; i < step; i++)
                {
                    if (i == step - 1) //最后一步直达目标
                    {
                        this.Height = finalHeight;
                        return;
                    }

                    this.Height += increment / step;

                    Application.DoEvents(); //必要
                    Thread.Sleep(10);
                }
            }

            /// <summary>
            /// 播放系统事件声音
            /// </summary>
            /// <remarks>之所以不用MessageBeep API是因为这货在srv08上不出声,所以用PlaySound代替</remarks>
            private static void PlaySystemSound(string soundAlias)
            {
                PlaySound(soundAlias, IntPtr.Zero, 0x10000 /*SND_ALIAS*/| 0x1 /*SND_ASYNC*/);
            }

            [DllImport("winmm.dll", CharSet = CharSet.Auto)]
            private static extern bool PlaySound([MarshalAs(UnmanagedType.LPWStr)] string soundName, IntPtr hmod, int soundFlags);

            #endregion

            #region 嵌套类

            /// <summary>
            /// 基础面板
            /// </summary>
            private class PanelBasic : Control
            {
                public PanelBasic()
                {
                    SetStyle(ControlStyles.AllPaintingInWmPaint, false);//关键,不然其上的ToolBar不正常
                    SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//重要。不设置的话控件绘制不正常
                    SetStyle(ControlStyles.ContainerControl, true);
                    SetStyle(ControlStyles.Selectable, false);
                }

                protected override void WndProc(ref Message m)
                {
                    //屏蔽WM_ERASEBKGND。防止显示时在原位置快闪
                    //不能通过ControlStyles.AllPaintingInWmPaint=true屏蔽
                    //会影响其上的ToolBar
                    if (m.Msg == 0x14) { return; }

                    base.WndProc(ref m);
                }

                protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)
                {
                    //防Dock时面板短暂滞留在原位置
                    base.SetBoundsCore(x, y, width, height, specified | BoundsSpecified.Y | BoundsSpecified.Width);
                }
            }

            /// <summary>
            /// 消息呈现控件
            /// </summary>
            private class MessageViewer : Control
            {
                const TextFormatFlags textFlags = TextFormatFlags.EndEllipsis //未完省略号
                                                  | TextFormatFlags.WordBreak //允许换行
                                                  | TextFormatFlags.NoPadding //无边距
                                                  | TextFormatFlags.ExternalLeading //行间空白。NT5必须,不然文字挤在一起
                                                  | TextFormatFlags.TextBoxControl; //避免半行

                const int IconSpace = 5; //图标与文本间距

                const float PreferredScale = 13;//最佳文本区块比例(宽/高)

                /// <summary>
                /// 最小高度。不要重写MinimumSize,那会在窗体移动和缩放时都会执行
                /// </summary>
                public int MinimumHeight
                {
                    get
                    {
                        return (this.Icon != null ? Math.Max(this.Icon.Height, this.FontHeight) : this.FontHeight) + Padding.Vertical;
                    }
                }

                /// <summary>
                /// 获取或设置图标
                /// </summary>
                public Icon Icon { get; set; }

                public MessageViewer()
                {
                    this.SetStyle(ControlStyles.CacheText, true);
                    this.SetStyle(ControlStyles.UserPaint, true);
                    this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
                    this.SetStyle(ControlStyles.Selectable, false);
                    this.SetStyle(ControlStyles.ResizeRedraw, true); //重要

                    this.DoubleBuffered = true; //双缓冲
                    BackColor = Environment.OSVersion.Version.Major == 5 ? SystemColors.Control : Color.White;
                }

                //防Dock改变尺寸
                protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)
                {
                    base.SetBoundsCore(x, y, width, height, specified | BoundsSpecified.Size);
                }

                /// <summary>
                /// 计算合适的消息区尺寸
                /// </summary>
                /// <param name="proposedSize">该参数此处定义为此控件可设置的最大尺寸</param>
                /// <remarks>该方法对太长的单行文本有做比例优化处理,避免用户摆头幅度过大扭到脖子</remarks>
                public override Size GetPreferredSize(Size proposedSize)
                {
                    if (proposedSize.Width < 10) { proposedSize.Width = int.MaxValue; }
                    if (proposedSize.Height < 10) { proposedSize.Height = int.MaxValue; }

                    int reservedWidth = Padding.Horizontal + (this.Icon == null ? 0 : (this.Icon.Width + IconSpace));

                    Size wellSize = Size.Empty;
                    if (!string.IsNullOrEmpty(this.Text))
                    {
                        //优化文本块宽高比例
                        Size size = TextRenderer.MeasureText(this.Text, this.Font, new Size(proposedSize.Width - reservedWidth, 0), textFlags);//用指定宽度测量文本面积
                        wellSize = Convert.ToSingle(size.Width) / size.Height > PreferredScale //过于宽扁的情况
                            ? Size.Ceiling(GetSameSizeWithNewScale(size, PreferredScale))
                            : size;

                        //凑齐整行高,确保尾行显示
                        int lineHeight = TextRenderer.MeasureText(" ", this.Font, new Size(int.MaxValue, 0), textFlags).Height;//单行高,Font.Height不靠谱
                        int differ;
                        wellSize.Height += (differ = wellSize.Height % lineHeight) == 0 ? 0 : (lineHeight - differ);
                    }
                    if (this.Icon != null)
                    {
                        wellSize.Width += this.Icon.Width + IconSpace;
                        wellSize.Height = Math.Max(this.Icon.Height, wellSize.Height);
                    }
                    wellSize += Padding.Size;

                    //不应超过指定尺寸。宽度在上面已确保不会超过
                    if (wellSize.Height > proposedSize.Height) { wellSize.Height = proposedSize.Height; }

                    return wellSize;
                }

                /// <summary>
                /// 重绘
                /// </summary>
                protected override void OnPaint(PaintEventArgs e)
                {
                    Graphics g = e.Graphics;
                    Rectangle rect = GetPaddedRectangle();

                    //绘制图标
                    if (this.Icon != null)
                    {
                        g.DrawIcon(this.Icon, Padding.Left, Padding.Top);

                        //右移文本区
                        rect.X += this.Icon.Width + IconSpace;
                        rect.Width -= this.Icon.Width + IconSpace;

                        //若文字太少,则与图标垂直居中
                        if (this.Text.Length < 100)
                        {
                            Size textSize = TextRenderer.MeasureText(g, this.Text, this.Font, rect.Size, textFlags);
                            if (textSize.Height <= this.Icon.Height)
                            {
                                rect.Y += (this.Icon.Height - textSize.Height) / 2;
                            }
                        }
                    }

                    //g.FillRectangle(Brushes.Gainsboro, rect);//test

                    //绘制文本
                    TextRenderer.DrawText(g, this.Text, this.Font, rect, Color.Black, textFlags);

                    base.OnPaint(e);
                }

                /// <summary>
                /// 根据原尺寸,得到相同面积、且指定比例的新尺寸
                /// </summary>
                /// <param name="src">原尺寸</param>
                /// <param name="scale">新尺寸比例。需是width/height</param>
                private static SizeF GetSameSizeWithNewScale(Size src, float scale)
                {
                    int sqr = src.Width * src.Height;//原面积
                    double w = Math.Sqrt(sqr * scale);//新面积宽
                    return new SizeF(Convert.ToSingle(w), Convert.ToSingle(sqr / w));
                }

                /// <summary>
                /// 获取刨去Padding的内容区
                /// </summary>
                private Rectangle GetPaddedRectangle()
                {
                    Rectangle r = this.ClientRectangle;
                    r.X += this.Padding.Left;
                    r.Y += this.Padding.Top;
                    r.Width -= this.Padding.Horizontal;
                    r.Height -= this.Padding.Vertical;
                    return r;
                }
            }

            /// <summary>
            /// 屏蔽全选消息的文本框
            /// </summary>
            private class TextBoxUnSelectAllable : TextBox
            {
                protected override void WndProc(ref Message m)
                {
                    //EM_SETSEL
                    if (m.Msg == 0xB1) { return; }

                    base.WndProc(ref m);
                }
            }

            /// <summary>
            /// 包装ToolBarButton为单一控件
            /// </summary>
            private class ToggleButton : Control
            {
                /// <summary>
                /// 展开/收起图标数据
                /// </summary>
                const string ImgDataBase64 =
@"iVBORw0KGgoAAAANSUhEUgAAACAAAAAQCAYAAAB3AH1ZAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ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";

                readonly bool isToggleMode;
                bool isChecked;
                bool useAnimate;
                readonly ImageList imgList;

                /// <summary>
                /// Checked改变后
                /// </summary>
                public event EventHandler CheckedChanged;

                /// <summary>
                /// 使用动画按钮效果
                /// </summary>
                private bool UseAnimate
                {
                    get { return useAnimate; }
                    set
                    {
                        if (useAnimate == value) { return; }

                        useAnimate = value;
                        if (IsHandleCreated) { this.CreateHandle(); }
                    }
                }

                /// <summary>
                /// 获取或设置按钮是否处于按下状态
                /// </summary>
                [Description("获取或设置按钮是否处于按下状态"), DefaultValue(false)]
                public bool Checked
                {
                    get
                    {
                        if (IsHandleCreated)
                        {
                            //保证isChecked与实情吻合。TB_ISBUTTONCHECKED
                            isChecked = Convert.ToBoolean(SendMessage(this.Handle, 0x40A, IntPtr.Zero, IntPtr.Zero).ToInt32());
                        }
                        return isChecked;
                    }
                    set
                    {
                        if (isChecked == value || !isToggleMode) { return; }

                        isChecked = value;

                        if (IsHandleCreated)
                        {
                            //TB_CHECKBUTTON
                            SendMessage(this.Handle, 0x402, IntPtr.Zero, new IntPtr(Convert.ToInt32(value)));
                        }

                        OnCheckedChanged(EventArgs.Empty);
                    }
                }

                /// <summary>
                /// 创建ToolBarButtonControl
                /// </summary>
                public ToggleButton(bool useAnimate)
                {
                    SetStyle(ControlStyles.UserPaint, false);
                    SetStyle(ControlStyles.AllPaintingInWmPaint, true);
                    SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
                    SetStyle(ControlStyles.ResizeRedraw, true);

                    this.isToggleMode = true;//写死好了,独立版才提供设置
                    this.UseAnimate = useAnimate;

                    //将图标加入imageList
                    imgList = new ImageList { ImageSize = new System.Drawing.Size(16, 16), ColorDepth = ColorDepth.Depth32Bit };
                    using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(ImgDataBase64)))
                    {
                        imgList.Images.AddStrip(Image.FromStream(ms));
                    }
                }

                /// <summary>
                /// 执行左键单击
                /// </summary>
                public void PerformClick()
                {
                    SendMessage(this.Handle, 0x201, new IntPtr(0x1), IntPtr.Zero);//WM_LBUTTONDOWN
                    Application.DoEvents();
                    SendMessage(this.Handle, 0x202, IntPtr.Zero, IntPtr.Zero);    //WM_LBUTTONUP
                }

                protected override void WndProc(ref Message m)
                {
                    //忽略鼠标双击消息,WM_LBUTTONDBLCLK
                    if (m.Msg == 0x203) { return; }

                    //有节操的响应鼠标动作
                    if ((m.Msg == 0x201 || m.Msg == 0x202) && (!this.Enabled || !this.Visible))
                    {
                        return;
                    }
                    base.WndProc(ref m);
                }

                //创建ToolBar
                protected override CreateParams CreateParams
                {
                    get
                    {
                        CreateParams prms = base.CreateParams;
                        prms.ClassName = "ToolbarWindow32";
                        prms.Style = 0x40000000
                            | 0x10000000
                            //| 0x2000000 //WS_CLIPCHILDREN
                            //| 0x8000
                            | 0x1
                            | 0x4
                            | 0x8
                            | 0x40
                            | 0x1000 //TBSTYLE_LIST,图标文本横排
                            ;
                        if (UseAnimate) { prms.Style |= 0x800; }//TBSTYLE_FLAT。flat模式在NT6.x下,按钮按下会有动画效果

                        prms.ExStyle = 0;

                        return prms;
                    }
                }

                protected override void OnHandleCreated(EventArgs e)
                {
                    base.OnHandleCreated(e);

                    //设置imgList
                    SendMessage(this.Handle, 0x430, IntPtr.Zero, imgList.Handle);//TB_SETIMAGELIST

                    //准备添加按钮
                    int btnStructSize = Marshal.SizeOf(typeof(TBBUTTON));
                    SendMessage(this.Handle, 0x41E, new IntPtr(btnStructSize), IntPtr.Zero);//TB_BUTTONSTRUCTSIZE,必须在添加按钮前

                    //构建按钮信息
                    TBBUTTON btnStruct = new TBBUTTON
                    {
                        //iBitmap = 0,
                        //idCommand = 0,
                        fsState = 0x4, //TBSTATE_ENABLED
                        iString = SendMessage(this.Handle, 0x44D, 0, this.Text + '\0')//TB_ADDSTRING
                    };
                    if (this.isToggleMode) { btnStruct.fsStyle = 0x2; }//BTNS_CHECK。作为切换按钮时

                    IntPtr btnStructStart = IntPtr.Zero;
                    try
                    {
                        btnStructStart = Marshal.AllocHGlobal(btnStructSize);//在非托管区创建一个指针
                        Marshal.StructureToPtr(btnStruct, btnStructStart, true);//把结构体塞到上述指针

                        //添加按钮
                        SendMessage(this.Handle, 0x444, new IntPtr(1)/*按钮数量*/, btnStructStart);//TB_ADDBUTTONS。从指针取按钮信息

                        //设置按钮尺寸刚好为ToolBar尺寸
                        AdjustButtonSize();
                    }
                    finally
                    {
                        if (btnStructStart != IntPtr.Zero) { Marshal.FreeHGlobal(btnStructStart); }
                    }
                }

                protected override bool ProcessCmdKey(ref Message m, Keys keyData)
                {
                    //将空格和回车作为鼠标单击处理
                    if (m.Msg == 0x100 && (keyData == Keys.Enter || keyData == Keys.Space))
                    {
                        PerformClick();
                        return true;
                    }

                    return base.ProcessCmdKey(ref m, keyData);
                }

                /// <summary>
                /// 处理助记键
                /// </summary>
                protected override bool ProcessMnemonic(char charCode)
                {
                    if (IsMnemonic(charCode, this.Text))
                    {
                        PerformClick();
                        return true;
                    }

                    return base.ProcessMnemonic(charCode);
                }

                protected override void OnClick(EventArgs e)
                {
                    //忽略鼠标右键
                    MouseEventArgs me = e as MouseEventArgs;
                    if (me != null && me.Button != System.Windows.Forms.MouseButtons.Left)
                    { return; }

                    //若是切换模式,直接引发Checked事件(不要通过设置Checked属性引发,因为OnClick发送之前就已经Check了)
                    //存在理论上的不可靠,但暂无更好办法
                    if (isToggleMode)
                    { this.OnCheckedChanged(EventArgs.Empty); }

                    base.OnClick(e);
                }

                //重绘后重设按钮尺寸
                protected override void OnInvalidated(InvalidateEventArgs e)
                {
                    base.OnInvalidated(e);
                    AdjustButtonSize();
                }

                /// <summary>
                /// 引发CheckedChanged事件
                /// </summary>
                protected virtual void OnCheckedChanged(EventArgs e)
                {
                    SetImageIndex(this.Checked ? 1 : 0);

                    if (CheckedChanged != null) { CheckedChanged(this, e); }
                }

                /// <summary>
                /// 设置图标索引
                /// </summary>
                private void SetImageIndex(int index)
                {
                    //TB_CHANGEBITMAP
                    SendMessage(this.Handle, 0x42B, IntPtr.Zero, new IntPtr(index));
                }

                /// <summary>
                /// 调整按钮尺寸刚好为ToolBar尺寸
                /// </summary>
                private void AdjustButtonSize()
                {
                    IntPtr lParam = new IntPtr((this.Width & 0xFFFF) | (this.Height << 0x10)); //MakeLParam手法
                    SendMessage(this.Handle, 0x41F, IntPtr.Zero, lParam); //TB_SETBUTTONSIZE
                }

                #region Win32 API

                [DllImport("user32.dll", CharSet = CharSet.Auto)]
                private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

                [DllImport("user32.dll", CharSet = CharSet.Auto)]
                private static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, string lParam);

                [StructLayout(LayoutKind.Sequential)]
                private struct TBBUTTON
                {
                    public int iBitmap;
                    public int idCommand;
                    public byte fsState;
                    public byte fsStyle;
                    public byte bReserved0;
                    public byte bReserved1;
                    public IntPtr dwData;
                    public IntPtr iString;
                }

                #endregion
            }

            #endregion
        }
    }
}

实现说明:

以下内容献给爱“八卦”和蛋疼的童鞋。这里先贴个概要类图,详细的后面有完整Demo下载,你可以down回去慢慢研究。

  • 若干Show方法都是调用私有的ShowCore方法,这个是模仿标准MessageBox的命名。至于意义,是因为公开方法要做参数检查,检查合格后的代码则可以重用。另外,几个存在参数检查的方法都是调用内部方法,而不是调参数最全的那个重载,也是因为要尽量避免无谓的参数检查,因为参数最全的那个公开方法,参数检查自然是做的最多的,那么少参方法本来已经能确保传入的是合法参数,却因为调它,就会造成无谓的检查,而调内部方法则可以避免,因为内部方法就应该设计为不做或少做参数检查的。啰嗦这个是想提醒初学者注意这些细节上的处理,性能要从细处抓起
  • 静态类MessageBoxEx内部维护着一个MessageForm窗体类(下文简称MsgFm),每次Show都会实例化一个MsgFm,show完即释放。几乎所有能力都是由后者提供,前者只是简单的对其封装和暴露,所以下面主要说MsgFm的事。另外,根据传入的MessageBoxButtons有无Cancel项,会启用/屏蔽窗体右上角的关闭按钮,因为单击关闭按钮的对话框结果始终是DialogResult.Cancel,所以如果不屏蔽,在传入YesNo这样的参数时候,调用者可能因为用户去点关闭按钮而得到Yes、No以外的结果。标准消息框也是有这样的屏蔽处理的
  • MsgFm由3个控件区构成,分别是主消息区、按钮区、详细信息区
    • 主消息区是一个单一控件:MessageViewer,直接继承自Control写成。一开始是考虑用现成的Label控件,但发现后者的图文混排效果差强人意(不要扯这个成语本来的意思),它是把文字直接盖在图标上,呵呵,大概此控件的编写者本意就是要把Image当BackgroundImage用,所以不得已另写一个MessageViewer。MV主要做了两个事,绘制(图标和文本)+根据内容确定自身尺寸,另外它还控制了最小高度,避免图标和文本整体被淹没
    • 按钮区由一个容器类控件PanelBasic托起4个按钮。PB同样是继承自Control,没有直接选用Panel的原因,主要是Panel会在设置Dock时跳一下,根源在Control.SetBoundsCore的specified参数通知了无谓的信息,所以干脆直接继承Control重写该方法,顺便处理一下消息,解决瞬闪的问题,具体原因这里不细说,注释里有简短说明,总之相信我不是蛋疼就行了。此外按钮区会根据按钮可见情况控制最小宽度,它与上面的MessageViewer的最小高度共同构成了整个对话框的最小尺寸MinimumSize
    • PanelBasic上的4个按钮分别是【详细信息】按钮和其它3个对话框命令按钮。仨按钮根据传入的MessageBoxButtons参数动态处理(按钮文本、是否可见等),没什么好说的。【详细信息】按钮(ToggleButton)则费了番功夫,该按钮从外观上就可以看出不是标准的Button,事实上它是个工具栏按钮:ToolBarButton,属于ToolBar上的Item,本身不是独立的控件(直接继承自Component)。这里扯一点,由于.net 2.0起MS就建议用新式的ToolStrip代替ToolBar,类似的还有MenuStrip代替MainMenu、StatusStrip代替StatusBar、ContextMenuStrip代替ContextMenu,VS2010更是默认就不在工具箱显示这些“控件”(有些不算控件),所以估计知道的新童鞋不多。后者都是原生的win32组件,前者则是纯.net实现的,有Office2003的控件风格。总之对于有win32 native控的我来说,对这些被建议替代的老式控件有特别的情结。所以这个ToggleButton实际上是由一个ToolBar和一个ToolBarButton组成的看起来像一个单一控件的东西,那为什么它还是继承自Control而不是直接用ToolBar呢,我承认这里面有练手的原因(迟些我可能会写一篇【教你一步步封装一个Win32原生控件】的文章),Hmmm~也就这个原因了,但它虽然增加了代码量,但请务必相信性能不比直接用ToolBar差,理论上还要好过,因为作为一个完备的ToolBar,MS要考虑的情况相当多,显然处理也少不了,而我这个ToggleButton由于只负责一个单一按钮的功能,所以其实很Simple很Lite~聪明的你会理解的。最后为什么要费事弄成ToolBarButton而不是直接用一个Button,是因为我看上了mstsc.exe的这个效果:
  • 尚存在一个问题,这个注释里也有坦白,就是当主消息文本非常非常多时~大概整屏那么长(这其实是不正确的使用姿势,上面说过,大量信息应该放详细信息区),如果对对话框反复拖拉、展开/收起,那么在某次展开时,TextBoxUnSelectAllable会瞬间在主消息区闪一下,这个问题在PanelBasic得到了完美的解决,但TextBox实在无能为力,尝试过直接用原生Edit控件也如此,所以暂时留着吧,哪有没缺憾的人生呢
  • 关于声音,由于MessageBeep API在srv08系统无声,所以用了PlaySound API代替。另外,让原本没声音的MessageBoxIcon.Question蹭SystemIcons.Information的声音,不能歧视人Question
  • 最后,【详细信息】按钮上那俩图标(展开、收起各一个)是我画的,本来想拣mstsc.exe上的,但发现效果不如意,还不如自己画

说了这么多,自以为很理想的实现,可能槽点也不少,再次恳请路过大侠指点,谢谢。

最后,Demo在此,里面有个Tester供你体验:

-文毕-

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