邮件发送类，支持HTML格式，支持优先级设置

    邮件发送类，支持HTML格式，支持优先级设置。通过SOCKET类实现的
 using System;
 using System.Text;
 using System.IO;
 using System.Net;
 using System.Net.Sockets;
 namespace Blood.Com.ClassLib
 {
 /// <summary>
 /// TcpClient派生类，用来进行SMTP服务器的连接工作
 /// </summary>
 public class SMTPClient : TcpClient
 {
 public bool isConnected()
 {
 return Active;
 }
 public void SendCommandToServer(string Command)
 {
 NetworkStream ns = this.GetStream() ;
 byte[] WriteBuffer ;
 WriteBuffer = new byte[1024] ;
 WriteBuffer = Encoding.Default.GetBytes(Command) ;
 ns.Write(WriteBuffer,0,WriteBuffer.Length);
 return ;
 }
 public string GetServerResponse()
 {
 int StreamSize ;
 string ReturnValue = "" ;
 byte[] ReadBuffer ;
 NetworkStream ns = this.GetStream() ;
 ReadBuffer = new byte[1024] ;
 StreamSize = ns.Read(ReadBuffer,0,ReadBuffer.Length);
 if (StreamSize==0)
 {
 return ReturnValue ;
 }
 else
 {
 ReturnValue = Encoding.Default.GetString(ReadBuffer);
 return ReturnValue;
 }
 }
 public bool DoesStringContainSMTPCode(string s,string SMTPCode)
 {
 return(s.IndexOf(SMTPCode,0,10)==-1)?false:true;
 }
 } //结束类
 /// <summary>
 /// 发送邮件类
 /// </summary>
 public class SMTPMail
 {
 /// <summary>
 /// 错误反馈信息
 /// </summary>
 private string strErrMessage = null;
 /// <summary>
 /// SMTP服务器反馈的信息
 /// </summary>
 private string strResponse;
 /// <summary>
 /// 构造函数
 /// </summary>
 public SMTPMail()
 {
 strErrMessage = "";
 strResponse = "";
 }
 /// <summary>
 /// 取得错误反馈信息
 /// </summary>
 public string ErrorMessage
 {
 get
 {
 return strErrMessage ;
 }
 }
 /// <summary>
 /// 取得SMTP服务器反馈的信息
 /// </summary>
 public string ServerResponse
 {
 get
 {
 return strResponse;
 }
 }
 /// <summary>
 /// 邮件发送优先级
 /// </summary>
 public enum Prioritys
 {
 /// <summary>
 /// 最高级别
 /// </summary>
 HIGH = 1,
 /// <summary>
 /// 默认级别
 /// </summary>
 NORMAL = 3,
 /// <summary>
 /// 最低级别
 /// </summary>
 LOW = 5
 }
 public void SendMail(string SmtpHost,int Port,string From,string DisplayFromName,string To,string DisplayToName,Prioritys Priority,bool Html,string Base,string Subject,string Message)
 {
 try
 {
 string strResponseNumber;
 SMTPClient smtpcMail = new SMTPClient();
 smtpcMail.Connect(SmtpHost,Port);
 bool bolConnect = smtpcMail.isConnected();
 //判断是否进行了连接
 if (!bolConnect)
 {
 strErrMessage = "Smtp服务器连接失败...";
 return;
 }
 //读取反馈信息
 strResponseNumber = smtpcMail.GetServerResponse();
 if (smtpcMail.DoesStringContainSMTPCode(strResponseNumber,"220"))
 {
 this.strResponse += strResponseNumber;
 }
 else
 {
 this.strErrMessage = "连接失败" + strResponseNumber;
 return ;
 }
 string[] strSendBuffer = new string[6];
 string[] strResponseCode = {"220","250","251","354","221"}; // success codes from SMTP server
 string strData = "";
 strData = string.Concat("HELO ",SmtpHost);
 strData = string.Concat(strData,"/r/n");
 strSendBuffer[0] = strData ;
 strData = "";
 strData = string.Concat("MAIL FROM: ","<" + From + ">");
 strData = string.Concat(strData,"/r/n");
 strSendBuffer[1] = strData;
 strData = "";
 strData = string.Concat("RCPT TO: ","<" + To + ">");
 strData = string.Concat(strData,"/r/n");
 strSendBuffer[2] = strData;
 strData = "" ;
 strData = string.Concat("DATA","/r/n");
 strSendBuffer[3] = strData ;
 strData = "" ;
 strData = string.Concat("From: ",DisplayFromName + "<" + From + ">");
 strData = string.Concat(strData,"/r/n" );
 strData = string.Concat(strData,"To: " );
 strData = string.Concat(strData,DisplayToName + "<" + To + ">");
 strData = string.Concat(strData,"/r/n" );
 strData = string.Concat(strData,"Subject: " );
 strData = string.Concat(strData,Subject);
 strData = string.Concat(strData,"/r/n");
 strData = string.Concat(strData,"MIME-Version: 1.0" );
 strData = string.Concat(strData,"/r/n");
 strData = string.Concat(strData,"X-Priority: " + Priority);
 strData = string.Concat(strData,"/r/n");
 strData = string.Concat(strData,"X-MSMail-Priority: " + Priority);
 strData = string.Concat(strData,"/r/n");
 if(Html == true)
 {
 strData = string.Concat(strData,"Content-Type: text/html;" );
 }
 else
 {
 strData = string.Concat(strData,"Content-Type: text/plain;" );
 }
 strData = string.Concat(strData,"/r/n");
 strData = string.Concat(strData,"charset=/"iso-8859-1/"" );
 strData = string.Concat(strData,"/r/n");
 if(Html == true)
 {
 strData = string.Concat(strData,"Content-Transfer-Encoding: text/html;" );
 }
 else
 {
 strData = string.Concat(strData,"Content-Transfer-Encoding: text/plain;" );
 }
 strData = string.Concat(strData,"/r/n");
 strData = string.Concat(strData,"Content-Base: /"" + Base + "/"" );
 strData = string.Concat(strData,"/r/n" + "/r/n");
 strData = string.Concat(strData,Message);
 strData = string.Concat(strData,"/r/n./r/n");
 strSendBuffer[4] = strData;
 strData = "" ;
 strData = string.Concat(strData,"QUIT/r/n");
 strSendBuffer[5] = strData;
 int i = 0 ;
 while(i < strSendBuffer.Length)
 {
 smtpcMail.SendCommandToServer(strSendBuffer[i]);
 strResponseNumber = smtpcMail.GetServerResponse();
 for(int j=0;j<strResponseCode.Length;j++)
 {
 if (smtpcMail.DoesStringContainSMTPCode(strResponseNumber,strResponseCode[j]))
 {
 this.strResponse += strResponseNumber;
 this.strResponse += "<br>";
 break;
 }
 else
 {
 if(j==strResponseCode.Length-1)
 {
 this.strErrMessage += strResponseNumber;
 this.strErrMessage += strSendBuffer[i];
 return;
 }
 }
 }
 i++ ;
 } // 结束循环
 }
 catch(SocketException err)
 {
 this.strErrMessage += err.Message + " " + err.StackTrace;
 }
 catch(Exception e)
 {
 this.strErrMessage += e.Message + " " + e.StackTrace;
 }
 } //结束邮件发送方法
 } // 结束类
 } // 结束Namespace
 邮件发送前台页面
 <%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="Test.SendMailSample" %>
 <HTML>
 <HEAD>
 <title>邮件发送例子</title>
 <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 <style type="text/css">TD {
 FONT-SIZE: 9pt; FONT-FAMILY: "宋体"
 }
 .TextBox {
 BORDER-RIGHT: #000000 thin dashed; BORDER-TOP: #000000 thin dashed; BORDER-LEFT: #000000 thin dashed; BORDER-BOTTOM: #000000 thin dashed
 }
 </style>
 </HEAD>
 <body text="#000000" bgColor="#ffffff">
 <form runat="server">
 <table style="BORDER-COLLAPSE: collapse" borderColor="#111111" cellSpacing="0" cellPadding="3" width="500" align="center" border="1">
 <tr>
 <td align="middle" colSpan="2">邮件发送例子（SOCKET类）</td>
 </tr>
 <asp:panel id="pelMessage" Visible="False" Runat="server">
 <TR>
 <TD align="middle" colSpan="2">
 <asp:Label id="lblMessage" runat="server"></asp:Label></TD>
 </TR>
 </asp:panel>
 <tr>
 <td align="right" width="150">SMTP服务器：</td>
 <td width="350"><asp:textbox id="txtSmtpHost" runat="server" CssClass="TextBox" MaxLength="50"></asp:textbox><asp:requiredfieldvalidator id="rfvSmtpHost" runat="server" ErrorMessage="*" ControlToValidate="txtSmtpHost" Display="Dynamic"></asp:requiredfieldvalidator></td>
 </tr>
 <tr>
 <td align="right" width="150">SMTP服务器端口：</td>
 <td width="350"><asp:textbox id="txtPort" runat="server" CssClass="TextBox" MaxLength="6"></asp:textbox><asp:requiredfieldvalidator id="rfvPort" runat="server" ErrorMessage="*" ControlToValidate="txtPort" Display="Dynamic"></asp:requiredfieldvalidator><asp:regularexpressionvalidator id="revPort" runat="server" ErrorMessage="只能输入数字" ValidationExpression="/d{1,}" ControlToValidate="txtPort" Display="Dynamic"></asp:regularexpressionvalidator></td>
 </tr>
 <tr>
 <td align="right" width="150">邮件发送者：</td>
 <td width="350"><asp:textbox id="txtFrom" runat="server" CssClass="TextBox" MaxLength="50"></asp:textbox><asp:requiredfieldvalidator id="rfvFrom" runat="server" ErrorMessage="*" ControlToValidate="txtFrom" Display="Dynamic"></asp:requiredfieldvalidator>
 <asp:regularexpressionvalidator id="revFrom" runat="server" ErrorMessage="邮件格式错误" ValidationExpression="/w+([-+.]/w+)*@/w+([-.]/w+)*/./w+([-.]/w+)*" ControlToValidate="txtFrom" Display="Dynamic"></asp:regularexpressionvalidator></td>
 </tr>
 <tr>
 <td align="right" width="150">发送者显示名称：</td>
 <td width="350"><asp:textbox id="txtFromName" runat="server" CssClass="TextBox" MaxLength="20"></asp:textbox></td>
 </tr>
 <tr>
 <td align="right" width="150">邮件接收者：</td>
 <td width="350"><asp:textbox id="txtTo" runat="server" CssClass="TextBox" MaxLength="50"></asp:textbox><asp:requiredfieldvalidator id="rfvTo" runat="server" ErrorMessage="*" ControlToValidate="txtTo" Display="Dynamic"></asp:requiredfieldvalidator>
 <asp:regularexpressionvalidator id="revTo" runat="server" ErrorMessage="邮件格式错误" ValidationExpression="/w+([-+.]/w+)*@/w+([-.]/w+)*/./w+([-.]/w+)*" ControlToValidate="txtTo" Display="Dynamic"></asp:regularexpressionvalidator></td>
 </tr>
 <tr>
 <td align="right" width="150">接收者显示名称：</td>
 <td width="350"><asp:textbox id="txtToName" runat="server" CssClass="TextBox" MaxLength="20"></asp:textbox></td>
 </tr>
 <tr>
 <td align="right" width="150">邮件发送优先级：</td>
 <td width="350"><asp:dropdownlist id="ddlPriority" runat="server">
 <asp:ListItem Value="高">高</asp:ListItem>
 <asp:ListItem Value="默认" Selected="True">默认</asp:ListItem>
 <asp:ListItem Value="低">低</asp:ListItem>
 </asp:dropdownlist></td>
 </tr>
 <tr>
 <td align="right" width="150">发送HTML格式的邮件：</td>
 <td width="350"><asp:dropdownlist id="ddlHtml" runat="server">
 <asp:ListItem Value="是" Selected="True">是</asp:ListItem>
 <asp:ListItem Value="否">否</asp:ListItem>
 </asp:dropdownlist></td>
 </tr>
 <tr>
 <td align="right" width="150">邮件主题：</td>
 <td width="350"><asp:textbox id="txtSubject" runat="server" CssClass="TextBox" MaxLength="50"></asp:textbox>
 <asp:RequiredFieldValidator id="rfvSubject" runat="server" ErrorMessage="*" ControlToValidate="txtSubject" Display="Dynamic"></asp:RequiredFieldValidator></td>
 </tr>
 <tr>
 <td align="right" width="150">邮件内容：</td>
 <td width="350">
 <asp:textbox id="txtMessage" runat="server" Rows="15" TextMode="MultiLine" CssClass="TextBox" Columns="40"></asp:textbox>
 <asp:RequiredFieldValidator id="rfvMessage" runat="server" ErrorMessage="*" ControlToValidate="txtMessage" Display="Dynamic"></asp:RequiredFieldValidator>
 </td>
 </tr>
 <tr align="middle">
 <td colSpan="2">
 <asp:Button id="btnSendMail" runat="server" Text="发送邮件" CssClass="TextBox" BackColor="Silver" ForeColor="Blue"></asp:Button>
 </td>
 </tr>
 </table>
 </form>
 </body>
 </HTML>
 邮件发送Codebehind
 using System;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using Blood.Com.ClassLib;
 namespace Test
 {
 /// <summary>
 /// 邮件发送例子
 /// </summary>
 public class SendMailSample : System.Web.UI.Page
 {
 protected System.Web.UI.WebControls.DataGrid DataGrid1;
 protected System.Web.UI.WebControls.DropDownList ddlPriority;
 protected System.Web.UI.WebControls.DropDownList ddlHtml;
 protected System.Web.UI.WebControls.TextBox txtSmtpHost;
 protected System.Web.UI.WebControls.TextBox txtPort;
 protected System.Web.UI.WebControls.TextBox txtFrom;
 protected System.Web.UI.WebControls.TextBox txtFromName;
 protected System.Web.UI.WebControls.TextBox txtTo;
 protected System.Web.UI.WebControls.TextBox txtToName;
 protected System.Web.UI.WebControls.TextBox txtSubject;
 protected System.Web.UI.WebControls.TextBox txtMessage;
 protected System.Web.UI.WebControls.RegularExpressionValidator revPort;
 protected System.Web.UI.WebControls.RequiredFieldValidator rfvSmtpHost;
 protected System.Web.UI.WebControls.RequiredFieldValidator rfvPort;
 protected System.Web.UI.WebControls.RequiredFieldValidator rfvFrom;
 protected System.Web.UI.WebControls.RequiredFieldValidator rfvTo;
 protected System.Web.UI.WebControls.RequiredFieldValidator rfvSubject;
 protected System.Web.UI.WebControls.RequiredFieldValidator rfvMessage;
 protected System.Web.UI.WebControls.Button btnSendMail;
 protected System.Web.UI.WebControls.Label lblMessage;
 protected System.Web.UI.WebControls.RegularExpressionValidator revFrom;
 protected System.Web.UI.WebControls.RegularExpressionValidator revTo;
 protected System.Web.UI.WebControls.Panel pelMessage;
 private void Page_Load(object sender, System.EventArgs e)
 {
 }
 #region Web Form Designer generated code
 override protected void OnInit(EventArgs e)
 {
 //
 // CODEGEN: This call is required by the ASP.NET Web Form Designer.
 //
 InitializeComponent();
 base.OnInit(e);
 }
 /// <summary>
 /// Required method for Designer support - do not modify
 /// the contents of this method with the code editor.
 /// </summary>
 private void InitializeComponent()
 {
 this.btnSendMail.Click += new System.EventHandler(this.btnSendMail_Click);
 this.Load += new System.EventHandler(this.Page_Load);
 }
 #endregion
 private void btnSendMail_Click(object sender, System.EventArgs e)
 {
 if(IsPostBack)
 {
 SMTPMail clsMail = new SMTPMail();
 string strSmtpHost = txtSmtpHost.Text;
 int intPort = Int32.Parse(txtPort.Text);
 string strFrom = txtFrom.Text;
 string strFromName = txtFromName.Text;
 string strTo = txtTo.Text;
 string strToName = txtToName.Text;
 SMTPMail.Prioritys Priority = SMTPMail.Prioritys.NORMAL;
 bool bolHtml;
 string strSubject = txtSubject.Text;
 string strMessage = txtMessage.Text;
 if(ddlPriority.SelectedItem.Text == "默认")
 {
 Priority = SMTPMail.Prioritys.NORMAL;
 }
 else if(ddlPriority.SelectedItem.Text == "高")
 {
 Priority = SMTPMail.Prioritys.HIGH;
 }
 else if(ddlPriority.SelectedItem.Text == "低")
 {
 Priority = SMTPMail.Prioritys.LOW;
 }
 if(ddlHtml.SelectedItem.Text == "是")
 {
 bolHtml = true;
 }
 else
 {
 bolHtml = false;
 }
 clsMail.SendMail(strSmtpHost,intPort,strFrom,strFromName,strTo,strToName,Priority,bolHtml,"",strSubject,strMessage);
 if(clsMail.ErrorMessage !="")
 {
 pelMessage.Visible = true;
 lblMessage.Text = clsMail.ErrorMessage;
 lblMessage.ForeColor = System.Drawing.Color.Red;
 }
 else
 {
 pelMessage.Visible = true;
 lblMessage.Text = "邮件发送成功";
 lblMessage.ForeColor = System.Drawing.Color.Blue;
 }
 }
 }
 }
 }