本文实例讲述了WinForm实现拦截窗体上各个部位的点击特效，是一个非常实用的技巧。分享给大家供大家参考。具体分析如下：

一般来说，windows窗体的标题栏无法直接通过一些默认的事件来控制，需要了解和WM_NCHITTEST相关的windows消息。

以下示例演示了最简单的效果片断：他会把客户区和标题栏的效果互换，比如无法按住标题栏拖动窗体而是改为了按住客户区拖动，并禁用了关闭按钮。 其中m.Result从-2到21都有定义，分别对应了整个窗体的各个部位，比如1代表客户区，8代表最小化按钮等等。

具体功能代码如下：

using System; using System.Windows.Forms; namespace WindowsApplication42 { public partial class Form1 : Form { public Form1() { InitializeComponent(); this.Text = "双击左上角图标关闭窗体"; } //拦击标题栏鼠标位置事件 const int WM_NCHITTEST = 0x84; protected override void WndProc(ref Message m) { base.WndProc(ref m); if (m.Msg == WM_NCHITTEST) { switch (m.Result.ToInt32()) { case 1://客户区 m.Result = new IntPtr(2); break; case 2://标题栏 m.Result = new IntPtr(1); break; case 20: m.Result = new IntPtr(0); break; default: Console.WriteLine(m); break; } } } } }

下面是各个常量的意义：从Delphi7 VCL中摘取：

{ WM_NCHITTEST and MOUSEHOOKSTRUCT Mouse Position Codes } {$EXTERNALSYM HTERROR} HTERROR = -2; {$EXTERNALSYM HTTRANSPARENT} HTTRANSPARENT = -1; {$EXTERNALSYM HTNOWHERE} HTNOWHERE = 0; {$EXTERNALSYM HTCLIENT} HTCLIENT = 1; {$EXTERNALSYM HTCAPTION} HTCAPTION = 2; {$EXTERNALSYM HTSYSMENU} HTSYSMENU = 3; {$EXTERNALSYM HTGROWBOX} HTGROWBOX = 4; {$EXTERNALSYM HTSIZE} HTSIZE = HTGROWBOX; {$EXTERNALSYM HTMENU} HTMENU = 5; {$EXTERNALSYM HTHSCROLL} HTHSCROLL = 6; {$EXTERNALSYM HTVSCROLL} HTVSCROLL = 7; {$EXTERNALSYM HTMINBUTTON} HTMINBUTTON = 8; {$EXTERNALSYM HTMAXBUTTON} HTMAXBUTTON = 9; {$EXTERNALSYM HTLEFT} HTLEFT = 10; {$EXTERNALSYM HTRIGHT} HTRIGHT = 11; {$EXTERNALSYM HTTOP} HTTOP = 12; {$EXTERNALSYM HTTOPLEFT} HTTOPLEFT = 13; {$EXTERNALSYM HTTOPRIGHT} HTTOPRIGHT = 14; {$EXTERNALSYM HTBOTTOM} HTBOTTOM = 15; {$EXTERNALSYM HTBOTTOMLEFT} HTBOTTOMLEFT = 16; {$EXTERNALSYM HTBOTTOMRIGHT} HTBOTTOMRIGHT = 17; {$EXTERNALSYM HTBORDER} HTBORDER = 18; {$EXTERNALSYM HTREDUCE} HTREDUCE = HTMINBUTTON; {$EXTERNALSYM HTZOOM} HTZOOM = HTMAXBUTTON; {$EXTERNALSYM HTSIZEFIRST} HTSIZEFIRST = HTLEFT; {$EXTERNALSYM HTSIZELAST} HTSIZELAST = HTBOTTOMRIGHT; {$EXTERNALSYM HTOBJECT} HTOBJECT = 19; {$EXTERNALSYM HTCLOSE} HTCLOSE = 20; {$EXTERNALSYM HTHELP} HTHELP = 21;

希望本文所述对大家的C#程序设计有所帮助。

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