blocks|key|197821|text|有一个codeproject项目可用HERE提供了这种功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|197822|在SO和其他电路板上遵循许多线程，这不能用普通的MessageBox来完成。|197823|编辑：|197824|我有一个想法，有点，嗯，是的..|197825|使用计时器并在MessageBox出现时启动。如果您的MessageBox只侦听OK按钮(只有1种可能性)，则使用OnTick-Event通过SendKeys.Send("{ESC}");模拟ESC-Press，然后停止计时器。|style|CODE|197826|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeproject.com/Articles/93429/messageBox-with-Timeout^0|I|4|0|0|0|0|0|1Z|N|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|12|8|@$A|13|B|14|L|M]]|9|@]|C|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]]]

There is an codeproject project avaliable <a href="http://www.codeproject.com/Articles/93429/messageBox-with-Timeout" rel="nofollow">HERE</a> that provides this functuanility.

Following many threads here on SO and other boards this cant be done with the normal MessageBox.

Edit:

I have an idea that is a bit ehmmm yeah..

Use a timer and start in when the MessageBox appears.
If your MessageBox only listens to the OK Button (only 1 possibility) then use the OnTick-Event to emulate an ESC-Press with <code>SendKeys.Send("{ESC}");</code> and then stop the timer.

blocks|key|3043228|text|你可以试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3043229|[DllImport("user32.dll",+EntryPoint="FindWindow",+SetLastError+=+true)]
static+extern+IntPtr+FindWindowByCaption(IntPtr+ZeroOnly,+string+lpWindowName);

[DllImport("user32.Dll")]
static+extern+int+PostMessage(IntPtr+hWnd,+UInt32+msg,+int+wParam,+int+lParam);

private+const+UInt32+WM_CLOSE+=+0x0010;

public+void+ShowAutoClosingMessageBox(string+message,+string+caption)
{
++++var+timer+=+new+System.Timers.Timer(5000)+{+AutoReset+=+false+};
++++timer.Elapsed+%2B=+delegate
++++{
++++++++IntPtr+hWnd+=+FindWindowByCaption(IntPtr.Zero,+caption);
++++++++if+(hWnd.ToInt32()+!=+0)+PostMessage(hWnd,+WM_CLOSE,+0,+0);
++++};
++++timer.Enabled+=+true;
++++MessageBox.Show(message,+caption);
}|code-block|syntax|javascript|3043230|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could try this:

<pre><code>[DllImport("user32.dll", EntryPoint="FindWindow", SetLastError = true)]
static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);

[DllImport("user32.Dll")]
static extern int PostMessage(IntPtr hWnd, UInt32 msg, int wParam, int lParam);

private const UInt32 WM_CLOSE = 0x0010;

public void ShowAutoClosingMessageBox(string message, string caption)
{
 var timer = new System.Timers.Timer(5000) { AutoReset = false };
 timer.Elapsed += delegate
 {
 IntPtr hWnd = FindWindowByCaption(IntPtr.Zero, caption);
 if (hWnd.ToInt32() != 0) PostMessage(hWnd, WM_CLOSE, 0, 0);
 };
 timer.Enabled = true;
 MessageBox.Show(message, caption);
}
</code></pre>

blocks|key|200886|text|尝试以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|200887|AutoClosingMessageBox.Show("Text",+"Caption",+1000);|code-block|syntax|javascript|200888|其中，AutoClosingMessageBox类按如下方式实现：|offset|length|style|CODE|200889|public+class+AutoClosingMessageBox+{
++++System.Threading.Timer+_timeoutTimer;
++++string+_caption;
++++AutoClosingMessageBox(string+text,+string+caption,+int+timeout)+{
++++++++_caption+=+caption;
++++++++_timeoutTimer+=+new+System.Threading.Timer(OnTimerElapsed,
++++++++++++null,+timeout,+System.Threading.Timeout.Infinite);
++++++++using(_timeoutTimer)
++++++++++++MessageBox.Show(text,+caption);
++++}
++++public+static+void+Show(string+text,+string+caption,+int+timeout)+{
++++++++new+AutoClosingMessageBox(text,+caption,+timeout);
++++}
++++void+OnTimerElapsed(object+state)+{
++++++++IntPtr+mbWnd+=+FindWindow("#32770",+_caption);+//+lpClassName+is+#32770+for+MessageBox
++++++++if(mbWnd+!=+IntPtr.Zero)
++++++++++++SendMessage(mbWnd,+WM_CLOSE,+IntPtr.Zero,+IntPtr.Zero);
++++++++_timeoutTimer.Dispose();
++++}
++++const+int+WM_CLOSE+=+0x0010;
++++[System.Runtime.InteropServices.DllImport("user32.dll",+SetLastError+=+true)]
++++static+extern+IntPtr+FindWindow(string+lpClassName,+string+lpWindowName);
++++[System.Runtime.InteropServices.DllImport("user32.dll",+CharSet+=+System.Runtime.InteropServices.CharSet.Auto)]
++++static+extern+IntPtr+SendMessage(IntPtr+hWnd,+UInt32+Msg,+IntPtr+wParam,+IntPtr+lParam);
}|200890|更新：如果你想在用户选择超时之前获得底层MessageBox的返回值，你可以使用以下版本的代码：|BOLD|200891|var+userResult+=+AutoClosingMessageBox.Show("Yes+or+No?",+"Caption",+1000,+MessageBoxButtons.YesNo);
if(userResult+==+System.Windows.Forms.DialogResult.Yes)+{+
++++//+do+something
}
...
public+class+AutoClosingMessageBox+{
++++System.Threading.Timer+_timeoutTimer;
++++string+_caption;
++++DialogResult+_result;
++++DialogResult+_timerResult;
++++AutoClosingMessageBox(string+text,+string+caption,+int+timeout,+MessageBoxButtons+buttons+=+MessageBoxButtons.OK,+DialogResult+timerResult+=+DialogResult.None)+{
++++++++_caption+=+caption;
++++++++_timeoutTimer+=+new+System.Threading.Timer(OnTimerElapsed,
++++++++++++null,+timeout,+System.Threading.Timeout.Infinite);
++++++++_timerResult+=+timerResult;
++++++++using(_timeoutTimer)
++++++++++++_result+=+MessageBox.Show(text,+caption,+buttons);
++++}
++++public+static+DialogResult+Show(string+text,+string+caption,+int+timeout,+MessageBoxButtons+buttons+=+MessageBoxButtons.OK,+DialogResult+timerResult+=+DialogResult.None)+{
++++++++return+new+AutoClosingMessageBox(text,+caption,+timeout,+buttons,+timerResult)._result;
++++}
++++void+OnTimerElapsed(object+state)+{
++++++++IntPtr+mbWnd+=+FindWindow("#32770",+_caption);+//+lpClassName+is+#32770+for+MessageBox
++++++++if(mbWnd+!=+IntPtr.Zero)
++++++++++++SendMessage(mbWnd,+WM_CLOSE,+IntPtr.Zero,+IntPtr.Zero);
++++++++_timeoutTimer.Dispose();
++++++++_result+=+_timerResult;
++++}
++++const+int+WM_CLOSE+=+0x0010;
++++[System.Runtime.InteropServices.DllImport("user32.dll",+SetLastError+=+true)]
++++static+extern+IntPtr+FindWindow(string+lpClassName,+string+lpWindowName);
++++[System.Runtime.InteropServices.DllImport("user32.dll",+CharSet+=+System.Runtime.InteropServices.CharSet.Auto)]
++++static+extern+IntPtr+SendMessage(IntPtr+hWnd,+UInt32+Msg,+IntPtr+wParam,+IntPtr+lParam);
}|200892|还有另一个更新|200893|我用YesNo按钮检查了@Jack的情况，发现发送WM_CLOSE消息的方法根本不起作用。|200894|我将在单独的AutoclosingMessageBox库的上下文中提供一个修复。这个库包含重新设计的方法，我相信它对某些人是有用的。|200895|它也可以通过NuGet+package获得|200896|Install-Package+AutoClosingMessageBox|200897|发行说明(v1.0.0.2):|200898|200899|新显示(IWin32Owner)应用编程接口，支持最流行的场景(在#1上下文中)；|unordered-list-item|200900|新工厂()应用编程接口，提供对MessageBox显示的完全控制；|200901|200902|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/DmitryGaravsky/AutoClosingMessageBox|1|https://www.nuget.org/packages/AutoClosingMessageBox|2|https://github.com/DmitryGaravsky/AutoClosingMessageBox/issues/1^0|0|0|3|L|0|0|0|3|0|0|0|7|0|2|5|P|8|0|6|L|0|0|6|D|1|0|0|0|F|0|0|X|2|2|0|0|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1Q|8|@$I|1R|J|1S|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1T|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1U|8|@$I|1V|J|1W|K|Q]]|9|@]|A|$]]|$1|R|3|S|5|D|7|1X|8|@]|9|@]|A|$E|F]]|$1|T|3|U|5|6|7|1Y|8|@$I|1Z|J|20|K|Q]]|9|@]|A|$]]|$1|V|3|W|5|6|7|21|8|@$I|22|J|23|K|L]|$I|24|J|25|K|L]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|26|8|@]|9|@$I|27|J|28|1|29]]|A|$]]|$1|Z|3|10|5|6|7|2A|8|@]|9|@$I|2B|J|2C|1|2D]]|A|$]]|$1|11|3|12|5|D|7|2E|8|@]|9|@]|A|$E|F]]|$1|13|3|14|5|6|7|2F|8|@$I|2G|J|2H|K|Q]]|9|@]|A|$]]|$1|15|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]|$1|16|3|17|5|18|7|2J|8|@]|9|@$I|2K|J|2L|1|2M]]|A|$]]|$1|19|3|1A|5|18|7|2N|8|@]|9|@]|A|$]]|$1|1B|3|-4|5|6|7|2O|8|@]|9|@]|A|$]]|$1|1C|3|-4|5|6|7|2P|8|@]|9|@]|A|$]]]|1D|$1E|$5|1F|1G|1H|A|$1I|1J]]|1K|$5|1F|1G|1H|A|$1I|1L]]|1M|$5|1F|1G|1H|A|$1I|1N]]]]

Try the following approach:

<pre><code>AutoClosingMessageBox.Show("Text", "Caption", 1000);
</code></pre>

Where the <code>AutoClosingMessageBox</code> class implemented as following:

<pre><code>public class AutoClosingMessageBox {
 System.Threading.Timer _timeoutTimer;
 string _caption;
 AutoClosingMessageBox(string text, string caption, int timeout) {
 _caption = caption;
 _timeoutTimer = new System.Threading.Timer(OnTimerElapsed,
 null, timeout, System.Threading.Timeout.Infinite);
 using(_timeoutTimer)
 MessageBox.Show(text, caption);
 }
 public static void Show(string text, string caption, int timeout) {
 new AutoClosingMessageBox(text, caption, timeout);
 }
 void OnTimerElapsed(object state) {
 IntPtr mbWnd = FindWindow("#32770", _caption); // lpClassName is #32770 for MessageBox
 if(mbWnd != IntPtr.Zero)
 SendMessage(mbWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
 _timeoutTimer.Dispose();
 }
 const int WM_CLOSE = 0x0010;
 [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
 static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
 [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
 static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
}
</code></pre>

Update:
If you want to get the return value of the underlying MessageBox when user selects something before the timeout you can use the following version of this code:

<pre><code>var userResult = AutoClosingMessageBox.Show("Yes or No?", "Caption", 1000, MessageBoxButtons.YesNo);
if(userResult == System.Windows.Forms.DialogResult.Yes) { 
 // do something
}
...
public class AutoClosingMessageBox {
 System.Threading.Timer _timeoutTimer;
 string _caption;
 DialogResult _result;
 DialogResult _timerResult;
 AutoClosingMessageBox(string text, string caption, int timeout, MessageBoxButtons buttons = MessageBoxButtons.OK, DialogResult timerResult = DialogResult.None) {
 _caption = caption;
 _timeoutTimer = new System.Threading.Timer(OnTimerElapsed,
 null, timeout, System.Threading.Timeout.Infinite);
 _timerResult = timerResult;
 using(_timeoutTimer)
 _result = MessageBox.Show(text, caption, buttons);
 }
 public static DialogResult Show(string text, string caption, int timeout, MessageBoxButtons buttons = MessageBoxButtons.OK, DialogResult timerResult = DialogResult.None) {
 return new AutoClosingMessageBox(text, caption, timeout, buttons, timerResult)._result;
 }
 void OnTimerElapsed(object state) {
 IntPtr mbWnd = FindWindow("#32770", _caption); // lpClassName is #32770 for MessageBox
 if(mbWnd != IntPtr.Zero)
 SendMessage(mbWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
 _timeoutTimer.Dispose();
 _result = _timerResult;
 }
 const int WM_CLOSE = 0x0010;
 [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
 static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
 [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
 static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
}
</code></pre>

Yet another Update 

I have checked the @Jack's case with <code>YesNo</code> buttons and discovered that the approach with sending the <code>WM_CLOSE</code> message does not work at all. 
I will provide a fix in the context of the separate <a href="https://github.com/DmitryGaravsky/AutoClosingMessageBox" rel="noreferrer">AutoclosingMessageBox</a> library. This library contains redesigned approach and, I believe, can be useful to someone. 
It also available via <a href="https://www.nuget.org/packages/AutoClosingMessageBox" rel="noreferrer">NuGet package</a>:

<pre><code>Install-Package AutoClosingMessageBox
</code></pre>

Release Notes (v1.0.0.2): 
- New Show(IWin32Owner) API to support most popular scenarios (in the 
context of <a href="https://github.com/DmitryGaravsky/AutoClosingMessageBox/issues/1" rel="noreferrer">#1</a> ); 
- New Factory() API to provide full control on MessageBox showing;

blocks|key|3043339|text|AppActivate！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3043340|如果你不介意把你的参考资料弄得乱七八糟，你可以包含Microsoft.Visualbasic,并使用这个非常简单的方法。|offset|length|style|CODE|3043341|显示MessageBox|3043342|++++(new+System.Threading.Thread(CloseIt)).Start();
++++MessageBox.Show("HI");|code-block|syntax|javascript|3043343|CloseIt函数：|3043344|public+void+CloseIt()
{
++++System.Threading.Thread.Sleep(2000);
++++Microsoft.VisualBasic.Interaction.AppActivate(+
+++++++++System.Diagnostics.Process.GetCurrentProcess().Id);
++++System.Windows.Forms.SendKeys.SendWait("+");
}|3043345|现在去洗手吧！|3043346|entityMap^0|0|P|M|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

<h1>AppActivate!</h1>
If you don't mind muddying your references a bit, you can include <code>Microsoft.Visualbasic,</code> and use this very short way.
Display the MessageBox
<pre><code> (new System.Threading.Thread(CloseIt)).Start();
 MessageBox.Show(&quot;HI&quot;);
</code></pre>
CloseIt Function:
<pre><code>public void CloseIt()
{
 System.Threading.Thread.Sleep(2000);
 Microsoft.VisualBasic.Interaction.AppActivate( 
 System.Diagnostics.Process.GetCurrentProcess().Id);
 System.Windows.Forms.SendKeys.SendWait(&quot; &quot;);
}
</code></pre>
Now go wash your hands!

blocks|key|200214|text|System.Windows.MessageBox.Show()方法有一个重载，它将所有者窗口作为第一个参数。如果我们创建一个不可见的所有者窗口，然后在指定的时间之后关闭它，那么它的子消息框也会关闭。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|200215|Window+owner+=+CreateAutoCloseWindow(dialogTimeout);
MessageBoxResult+result+=+MessageBox.Show(owner,+...|code-block|syntax|javascript|200216|到目前一切尚好。但是，如果UI线程被消息框阻塞，并且无法从工作线程访问UI控件，我们如何关闭窗口？答案是-通过向所有者窗口句柄发送一条WM_CLOSE窗口消息：|200217|Window+CreateAutoCloseWindow(TimeSpan+timeout)
{
++++Window+window+=+new+Window()
++++{
++++++++WindowStyle+=+WindowStyle.None,
++++++++WindowState+=+System.Windows.WindowState.Maximized,
++++++++Background+=++System.Windows.Media.Brushes.Transparent,+
++++++++AllowsTransparency+=+true,
++++++++ShowInTaskbar+=+false,
++++++++ShowActivated+=+true,
++++++++Topmost+=+true
++++};

++++window.Show();

++++IntPtr+handle+=+new+WindowInteropHelper(window).Handle;

++++Task.Delay((int)timeout.TotalMilliseconds).ContinueWith(
++++++++t+=>+NativeMethods.SendMessage(handle,+0x10+/*WM_CLOSE*/,+IntPtr.Zero,+IntPtr.Zero));

++++return+window;
}|200218|下面是SendMessage+Windows+API方法的导入：|200219|static+class+NativeMethods
{
++++[DllImport("user32.dll",+CharSet+=+CharSet.Auto)]
++++public+static+extern+IntPtr+SendMessage(IntPtr+hWnd,+UInt32+Msg,+IntPtr+wParam,+IntPtr+lParam);
}|200220|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

The System.Windows.MessageBox.Show() method has an overload which takes an owner Window as the first parameter. If we create an invisible owner Window which we then close after a specified time, it's child message box would close as well.

<pre><code>Window owner = CreateAutoCloseWindow(dialogTimeout);
MessageBoxResult result = MessageBox.Show(owner, ...
</code></pre>

So far so good. But how do we close a window if the UI thread is blocked by the message box and UI controls can't be accessed from a worker thread? The answer is - by sending a WM_CLOSE windows message to the owner window handle:

<pre><code>Window CreateAutoCloseWindow(TimeSpan timeout)
{
 Window window = new Window()
 {
 WindowStyle = WindowStyle.None,
 WindowState = System.Windows.WindowState.Maximized,
 Background = System.Windows.Media.Brushes.Transparent, 
 AllowsTransparency = true,
 ShowInTaskbar = false,
 ShowActivated = true,
 Topmost = true
 };

 window.Show();

 IntPtr handle = new WindowInteropHelper(window).Handle;

 Task.Delay((int)timeout.TotalMilliseconds).ContinueWith(
 t =&gt; NativeMethods.SendMessage(handle, 0x10 /*WM_CLOSE*/, IntPtr.Zero, IntPtr.Zero));

 return window;
}
</code></pre>

And here is the import for the SendMessage Windows API method:

<pre><code>static class NativeMethods
{
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
}
</code></pre>

blocks|key|200246|text|在WinForms中工作的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|200247|var+w+=+new+Form()+{+Size+=+new+Size(0,+0)+};
Task.Delay(TimeSpan.FromSeconds(10))
++++.ContinueWith((t)+=>+w.Close(),+TaskScheduler.FromCurrentSynchronizationContext());

MessageBox.Show(w,+message,+caption);|code-block|syntax|javascript|200248|基于这样的效果:关闭拥有消息框的窗体也会关闭该框。|200249|Windows窗体控件有一个要求，即必须在创建它们的同一线程上访问它们。假设上面的示例代码是在UI线程或用户创建的线程上执行的，使用TaskScheduler.FromCurrentSynchronizationContext()将确保这一点。如果代码在线程池(例如，计时器回调)或任务池(例如，使用默认参数使用TaskFactory.StartNew或Task.Run创建的任务)中的线程上执行，则该示例将无法正常工作。|offset|length|style|CODE|200250|entityMap^0|0|0|0|1U|1D|4C|K|4X|8|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]|$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

A solution that works in WinForms:

<pre><code>var w = new Form() { Size = new Size(0, 0) };
Task.Delay(TimeSpan.FromSeconds(10))
 .ContinueWith((t) =&gt; w.Close(), TaskScheduler.FromCurrentSynchronizationContext());

MessageBox.Show(w, message, caption);
</code></pre>

Based on the effect that closing the form that owns the message box will close the box as well.

Windows Forms controls have a requirement that they must be accessed on the same thread that created them. Using <code>TaskScheduler.FromCurrentSynchronizationContext()</code> will ensure that, assuming that the example code above is executed on the UI thread, or an user-created thread. The example will not work correctly if the code is executed on a thread from a thread pool (e.g. a timer callback) or a task pool (e.g. on a task created with <code>TaskFactory.StartNew</code> or <code>Task.Run</code> with default parameters).

blocks|key|2830977|text|CodeProject的RogerB对这个问题有一个最巧妙的解决方案，他早在04年就这样做了，而且现在还在继续。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2830978|基本上，你就是go+here+to+his+project+and+download+the+CS+file。以防那个链接断掉，我这里有一个备份gist。将CS文件添加到您的项目中，或者将代码复制/粘贴到某个地方。|2830979|然后，您所要做的就是切换|2830980|DialogResult+result+=+MessageBox.Show("Text","Title",+MessageBoxButtons.CHOICE)|code-block|syntax|javascript|2830981|至|2830982|DialogResult+result+=+MessageBoxEx.Show("Text","Title",+MessageBoxButtons.CHOICE,+timer_ms)|2830983|你就可以走了。|2830984|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeproject.com/script/Membership/View.aspx?mid=716667|1|http://www.codeproject.com/Articles/7968/MessageBox-with-a-timeout-for-NET|2|https://gist.github.com/the-nose-knows/b933ab0a041cc482834c2184ccb27c3d^0|C|6|0|0|7|1B|1|20|4|2|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]|$A|1C|B|1D|1|1E]]|C|$]]|$1|F|3|G|5|6|7|1F|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1G|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1H|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|1I|8|@]|9|@]|C|$K|L]]|$1|Q|3|R|5|6|7|1J|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]|12|$5|V|W|X|C|$Y|13]]]]

<a href="http://www.codeproject.com/script/Membership/View.aspx?mid=716667" rel="nofollow noreferrer">RogerB</a> over at CodeProject has one of the slickest solutions to this answer, and he did that back in '04, and it's still bangin'

Basically, you <a href="http://www.codeproject.com/Articles/7968/MessageBox-with-a-timeout-for-NET" rel="nofollow noreferrer">go here to his project and download the CS file</a>. In case that link ever dies, I've got a backup <a href="https://gist.github.com/the-nose-knows/b933ab0a041cc482834c2184ccb27c3d" rel="nofollow noreferrer">gist</a> here. Add the CS file to your project, or copy/paste the code somewhere if you'd rather do that.

Then, all you'd have to do is switch

<pre><code>DialogResult result = MessageBox.Show("Text","Title", MessageBoxButtons.CHOICE)
</code></pre>

to

<pre><code>DialogResult result = MessageBoxEx.Show("Text","Title", MessageBoxButtons.CHOICE, timer_ms)
</code></pre>

And you're good to go.

blocks|key|2831002|text|user32.dll中有一个名为MessageBoxTimeout()的未记录的API，但它需要Windows+XP或更高版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2831003|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

There is an undocumented API in user32.dll named MessageBoxTimeout() but it requires Windows XP or later.

blocks|key|2831029|text|DMitryG的代码“获取底层MessageBox的返回值”有一个错误，因此timerResult实际上永远不会正确返回(MessageBox.Show调用在OnTimerElapsed完成后返回)。我的解决方案如下：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2831030|public+class+TimedMessageBox+{
++++System.Threading.Timer+_timeoutTimer;
++++string+_caption;
++++DialogResult+_result;
++++DialogResult+_timerResult;
++++bool+timedOut+=+false;

++++TimedMessageBox(string+text,+string+caption,+int+timeout,+MessageBoxButtons+buttons+=+MessageBoxButtons.OK,+DialogResult+timerResult+=+DialogResult.None)
++++{
++++++++_caption+=+caption;
++++++++_timeoutTimer+=+new+System.Threading.Timer(OnTimerElapsed,
++++++++++++null,+timeout,+System.Threading.Timeout.Infinite);
++++++++_timerResult+=+timerResult;
++++++++using(_timeoutTimer)
++++++++++++_result+=+MessageBox.Show(text,+caption,+buttons);
++++++++if+(timedOut)+_result+=+_timerResult;
++++}

++++public+static+DialogResult+Show(string+text,+string+caption,+int+timeout,+MessageBoxButtons+buttons+=+MessageBoxButtons.OK,+DialogResult+timerResult+=+DialogResult.None)+{
++++++++return+new+TimedMessageBox(text,+caption,+timeout,+buttons,+timerResult)._result;
++++}

++++void+OnTimerElapsed(object+state)+{
++++++++IntPtr+mbWnd+=+FindWindow("#32770",+_caption);+//+lpClassName+is+#32770+for+MessageBox
++++++++if(mbWnd+!=+IntPtr.Zero)
++++++++++++SendMessage(mbWnd,+WM_CLOSE,+IntPtr.Zero,+IntPtr.Zero);
++++++++_timeoutTimer.Dispose();
++++++++timedOut+=+true;
++++}

++++const+int+WM_CLOSE+=+0x0010;
++++[System.Runtime.InteropServices.DllImport("user32.dll",+SetLastError+=+true,+CharSet+=+System.Runtime.InteropServices.CharSet.Auto)]
++++static+extern+IntPtr+FindWindow(string+lpClassName,+string+lpWindowName);
++++[System.Runtime.InteropServices.DllImport("user32.dll",+CharSet+=+System.Runtime.InteropServices.CharSet.Auto)]
++++static+extern+IntPtr+SendMessage(IntPtr+hWnd,+UInt32+Msg,+IntPtr+wParam,+IntPtr+lParam);
}|code-block|syntax|javascript|2831031|entityMap^0|F|A|1P|F|27|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

DMitryG's code "get the return value of the underlying <code>MessageBox</code>" has a bug so the timerResult is never actually correctly returned (<code>MessageBox.Show</code> call returns AFTER <code>OnTimerElapsed</code> completes). My fix is below:

<pre><code>public class TimedMessageBox {
 System.Threading.Timer _timeoutTimer;
 string _caption;
 DialogResult _result;
 DialogResult _timerResult;
 bool timedOut = false;

 TimedMessageBox(string text, string caption, int timeout, MessageBoxButtons buttons = MessageBoxButtons.OK, DialogResult timerResult = DialogResult.None)
 {
 _caption = caption;
 _timeoutTimer = new System.Threading.Timer(OnTimerElapsed,
 null, timeout, System.Threading.Timeout.Infinite);
 _timerResult = timerResult;
 using(_timeoutTimer)
 _result = MessageBox.Show(text, caption, buttons);
 if (timedOut) _result = _timerResult;
 }

 public static DialogResult Show(string text, string caption, int timeout, MessageBoxButtons buttons = MessageBoxButtons.OK, DialogResult timerResult = DialogResult.None) {
 return new TimedMessageBox(text, caption, timeout, buttons, timerResult)._result;
 }

 void OnTimerElapsed(object state) {
 IntPtr mbWnd = FindWindow("#32770", _caption); // lpClassName is #32770 for MessageBox
 if(mbWnd != IntPtr.Zero)
 SendMessage(mbWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
 _timeoutTimer.Dispose();
 timedOut = true;
 }

 const int WM_CLOSE = 0x0010;
 [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
 static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
 [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
 static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
}
</code></pre>

blocks|key|3043505|text|使用EndDialog而不是发送WM_CLOSE|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3043506|[DllImport("user32.dll")]
public+static+extern+int+EndDialog(IntPtr+hDlg,+IntPtr+nResult);|code-block|syntax|javascript|3043507|entityMap^0|2|9|G|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

use <code>EndDialog</code> instead of sending <code>WM_CLOSE</code>:

<pre class="lang-cs prettyprint-override"><code>[DllImport("user32.dll")]
public static extern int EndDialog(IntPtr hDlg, IntPtr nResult);
</code></pre>

blocks|key|2831051|text|Vb.net库有一个使用interaction类的简单解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2831052|void+MsgPopup(string+text,+string+title,+int+secs+=+3)
{
++++dynamic+intr+=+Microsoft.VisualBasic.Interaction.CreateObject("WScript.Shell");
++++intr.Popup(text,+secs,+title);
}

bool+MsgPopupYesNo(string+text,+string+title,+int+secs+=+3)
{
++++dynamic+intr+=+Microsoft.VisualBasic.Interaction.CreateObject("WScript.Shell");
++++int+answer+=+intr.Popup(text,+secs,+title,+(int)Microsoft.VisualBasic.Constants.vbYesNo+%2B+(int)Microsoft.VisualBasic.Constants.vbQuestion);
++++return+(answer+==+6);
}|code-block|syntax|javascript|2831053|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Vb.net library has a simple solution using interaction class for this:

<pre><code>void MsgPopup(string text, string title, int secs = 3)
{
 dynamic intr = Microsoft.VisualBasic.Interaction.CreateObject("WScript.Shell");
 intr.Popup(text, secs, title);
}

bool MsgPopupYesNo(string text, string title, int secs = 3)
{
 dynamic intr = Microsoft.VisualBasic.Interaction.CreateObject("WScript.Shell");
 int answer = intr.Popup(text, secs, title, (int)Microsoft.VisualBasic.Constants.vbYesNo + (int)Microsoft.VisualBasic.Constants.vbQuestion);
 return (answer == 6);
}
</code></pre>

blocks|key|200998|text|我是这样做的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|200999|var+owner+=+new+Form+{+TopMost+=+true+};
Task.Delay(30000).ContinueWith(t+=>+{
owner.Invoke(new+Action(()=>
{
++++++if+(!owner.IsDisposed)
++++++{
++++++++++owner.Close();
++++++}
+++}));
});
var+dialogRes+=++MessageBox.Show(owner,+msg,+"Info",+MessageBoxButtons.YesNo,+MessageBoxIcon.Information);|code-block|syntax|javascript|201000|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I did it like this

<pre><code>var owner = new Form { TopMost = true };
Task.Delay(30000).ContinueWith(t =&gt; {
owner.Invoke(new Action(()=&gt;
{
 if (!owner.IsDisposed)
 {
 owner.Close();
 }
 }));
});
var dialogRes = MessageBox.Show(owner, msg, "Info", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
</code></pre>

blocks|key|2831062|text|如果有人想在c%2B%2B中使用AutoClosingMessageBox，我已经实现了等效的代码，下面是指向gists的链接|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2831063|static+intptr_t+MessageBoxHookProc(int+nCode,+intptr_t+wParam,+intptr_t+lParam)
{
++++if+(nCode+<+0)
++++++++return+CallNextHookEx(hHook,+nCode,+wParam,+lParam);

++++auto+msg+=+reinterpret_cast<CWPRETSTRUCT*>(lParam);
++++auto+hook+=+hHook;

++++//Hook+Messagebox+on+Initialization.
++++if+(!hookCaption.empty()+&&+msg->message+==+WM_INITDIALOG)
++++{
++++++++int+nLength+=+GetWindowTextLength(msg->hwnd);
++++++++char*+text+=+new+char[captionLen+%2B+1];

++++++++GetWindowText(msg->hwnd,+text,+captionLen+%2B+1);

++++++++//If+Caption+window+found+Unhook+it.
++++++++if+(hookCaption+==+text)
++++++++{
++++++++++++hookCaption+=+string("");
++++++++++++SetTimer(msg->hwnd,+(uintptr_t)timerID,+hookTimeout,+(TIMERPROC)hookTimer);
++++++++++++UnhookWindowsHookEx(hHook);
++++++++++++hHook+=+0;
++++++++}
++++}

++++return+CallNextHookEx(hook,+nCode,+wParam,+lParam);
}|code-block|syntax|javascript|2831064|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/haseeb-heaven/a97ea40c4ca3b6ba6d5a1b8348bd0585^0|6|3|1F|5|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If anyone wants AutoClosingMessageBox in c++ I have implemented the equivalent code here is the link to <a href="https://gist.github.com/haseeb-heaven/a97ea40c4ca3b6ba6d5a1b8348bd0585" rel="nofollow noreferrer">gists</a>
<pre><code>static intptr_t MessageBoxHookProc(int nCode, intptr_t wParam, intptr_t lParam)
{
 if (nCode &lt; 0)
 return CallNextHookEx(hHook, nCode, wParam, lParam);

 auto msg = reinterpret_cast&lt;CWPRETSTRUCT*&gt;(lParam);
 auto hook = hHook;

 //Hook Messagebox on Initialization.
 if (!hookCaption.empty() &amp;&amp; msg-&gt;message == WM_INITDIALOG)
 {
 int nLength = GetWindowTextLength(msg-&gt;hwnd);
 char* text = new char[captionLen + 1];

 GetWindowText(msg-&gt;hwnd, text, captionLen + 1);

 //If Caption window found Unhook it.
 if (hookCaption == text)
 {
 hookCaption = string(&quot;&quot;);
 SetTimer(msg-&gt;hwnd, (uintptr_t)timerID, hookTimeout, (TIMERPROC)hookTimer);
 UnhookWindowsHookEx(hHook);
 hHook = 0;
 }
 }

 return CallNextHookEx(hook, nCode, wParam, lParam);
}
</code></pre>

blocks|key|201016|text|我知道这个问题已经存在8年了，但是有一个更好的解决方案来解决这个问题。它一直存在，现在仍然存在：User32.dll!MessageBoxTimeout.|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|201017|这是Microsoft+Windows使用的一个未记录的函数，它可以做您想要做的事情，甚至更多。它也支持不同的语言。|201018|C#导入：|201019|[DllImport("user32.dll",+SetLastError+=+true)]
public+static+extern+int+MessageBoxTimeout(IntPtr+hWnd,+String+lpText,+String+lpCaption,+uint+uType,+Int16+wLanguageId,+Int32+dwMilliseconds);

[DllImport("user32.dll",+SetLastError+=+true)]
public+static+extern+IntPtr+GetForegroundWindow();|code-block|syntax|javascript|201020|如何在C#中使用它：|201021|uint+uiFlags+=+/*MB_OK*/+0x00000000+%7C+/*MB_SETFOREGROUND*/++0x00010000+%7C+/*MB_SYSTEMMODAL*/+0x00001000+%7C+/*MB_ICONEXCLAMATION*/+0x00000030;

NativeFunctions.MessageBoxTimeout(NativeFunctions.GetForegroundWindow(),+$"Kitty",+$"Hello",+uiFlags,+0,+5000);|201022|更聪明地工作，而不是更努力。|201023|entityMap^0|1C|S|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|11|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|14|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

I know this question is 8 year old, however there was and is a better solution for this purpose. It's always been there, and still is: User32.dll!MessageBoxTimeout.
This is an undocumented function used by Microsoft Windows, and it does exactly what you want and even more. It supports different languages as well.
C# Import:
<pre><code>[DllImport(&quot;user32.dll&quot;, SetLastError = true)]
public static extern int MessageBoxTimeout(IntPtr hWnd, String lpText, String lpCaption, uint uType, Int16 wLanguageId, Int32 dwMilliseconds);

[DllImport(&quot;user32.dll&quot;, SetLastError = true)]
public static extern IntPtr GetForegroundWindow();
</code></pre>
How to use it in C#:
<pre><code>uint uiFlags = /*MB_OK*/ 0x00000000 | /*MB_SETFOREGROUND*/ 0x00010000 | /*MB_SYSTEMMODAL*/ 0x00001000 | /*MB_ICONEXCLAMATION*/ 0x00000030;

NativeFunctions.MessageBoxTimeout(NativeFunctions.GetForegroundWindow(), $&quot;Kitty&quot;, $&quot;Hello&quot;, uiFlags, 0, 5000);
</code></pre>
Work smarter, not harder.

I have a Windows Forms application VS2010 C# where I display a MessageBox for show a message. 

I have an okay button, but if they walk away, I want to timeout and close the message box after lets say 5 seconds, automatically close the message box.

There are custom MessageBox (that inherited from Form) or another reporter Forms, but it would be interesting not necessary a Form.

Any suggestions or samples about it?

Updated: 

For WPF 
<a href="https://stackoverflow.com/questions/4362235/automatically-close-messagebox-in-c-sharp">Automatically close messagebox in C#</a>

Custom MessageBox (using Form inherit) 
<a href="http://www.codeproject.com/Articles/17253/A-Custom-Message-Box" rel="noreferrer">http://www.codeproject.com/Articles/17253/A-Custom-Message-Box</a>

<a href="http://www.codeproject.com/Articles/327212/Custom-Message-Box-in-VC" rel="noreferrer">http://www.codeproject.com/Articles/327212/Custom-Message-Box-in-VC</a>

<a href="http://tutplusplus.blogspot.com.es/2010/07/c-tutorial-create-your-own-custom.html" rel="noreferrer">http://tutplusplus.blogspot.com.es/2010/07/c-tutorial-create-your-own-custom.html</a>

<a href="http://medmondson2011.wordpress.com/2010/04/07/easy-to-use-custom-c-message-box-with-a-configurable-checkbox/" rel="noreferrer">http://medmondson2011.wordpress.com/2010/04/07/easy-to-use-custom-c-message-box-with-a-configurable-checkbox/</a>

Scrollable MessageBox 
<a href="https://stackoverflow.com/questions/4681936/a-scrollable-messagebox-in-c-sharp">A Scrollable MessageBox in C#</a>

Exception Reporter 
<a href="https://stackoverflow.com/questions/49224/good-crash-reporting-library-in-c-sharp">https://stackoverflow.com/questions/49224/good-crash-reporting-library-in-c-sharp</a>

<a href="http://www.codeproject.com/Articles/6895/A-Reusable-Flexible-Error-Reporting-Framework" rel="noreferrer">http://www.codeproject.com/Articles/6895/A-Reusable-Flexible-Error-Reporting-Framework</a>

Solution:

Maybe I think the following answers are good solution, without use a Form.

<a href="https://stackoverflow.com/a/14522902/206730">https://stackoverflow.com/a/14522902/206730</a> 
<a href="https://stackoverflow.com/a/14522952/206730">https://stackoverflow.com/a/14522952/206730</a>

Close a MessageBox after several seconds

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个Windows Forms应用程序VS2010 C#，其中我显示了一个用于显示消息的MessageBox。我有一个if按钮，但如果他们离开了，我想超时并在5秒后关闭消息框，自动关闭消息框。有一些自定义的MessageBox (从Form继承而来)或另一个报表表单，但它不是必须的表单，这将是很有趣的。对此有什么建...

问几秒钟后关闭MessageBox
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