学步园

其实这不是一个高深的问题，只为记录，带忘记时以便快速找回。

以下是整个事件的回溯（请注意是倒推）：

1.委托的挂接与执行，参见http://www.cnblogs.com/flashvan/archive/2005/09/06/230752.html

2.Button.OnClick可追溯到Control.WmMouseUp

if (fireClick && !ValidationCancelled) {<br /> if (!GetState(STATE_DOUBLECLICKFIRED)) {<br /> //OnClick(EventArgs.Empty);<br /> //In Whidbey .. if the click in by MOUSE then pass the MouseEventArgs...<br /> OnClick(new MouseEventArgs(button, clicks, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0));<br /> OnMouseClick(new MouseEventArgs(button, clicks, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0)); </p> <p> }</p> <p> else {<br /> //OnDoubleClick(EventArgs.Empty);<br /> OnDoubleClick(new MouseEventArgs(button, 2, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0));<br /> OnMouseDoubleClick(new MouseEventArgs(button, 2, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0));<br /> }</p> <p> }<br /> //call the MouseUp Finally...<br /> OnMouseUp(new MouseEventArgs(button, clicks, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0));

题外：通过源代码，另外可知Click先于MouseUp事件.

3.Control.WmMouseUp则在Control.WndProc执行

case NativeMethods.WM_LBUTTONUP:<br /> WmMouseUp(ref m, MouseButtons.Left, 1);<br /> break;</p> <p>case NativeMethods.WM_MBUTTONUP:<br /> WmMouseUp(ref m, MouseButtons.Middle, 1);<br /> break; </p> <p>case NativeMethods.WM_XBUTTONUP:<br /> WmMouseUp(ref m, GetXButton(NativeMethods.Util.HIWORD(m.WParam)), 1);<br /> break;

4.WndProc又在哪调用，参见http://blog.csdn.net/caimouse/archive/2010/01/02/5120173.aspx

关于“可以将WndProc看作由DispatchMessage进行调用”，一直在争，个人觉得这种说法，没有任何问题。

5.DispatchMessage

Ln000：while (GetMessage(&msg, NULL, 0, 0))</p> <p>Ln001：{</p> <p>Ln002： TranslateMessage(&msg);</p> <p>Ln003： DispatchMessage(&msg);</p> <p>Ln004：}<br />

 6.而GetMessage，可参见：http://blog.csdn.net/fireseed/archive/2002/09/10/2176.aspx

原文是MSDN，Bob Gunderson，深入GetMessage和PeekMessage。这篇文章，相当透彻，需仔细阅读。

最后，本文只是一篇文章索引，正如文章的初衷，以此方便日后追溯。