本文匯總了幾個WinForm中常見的實用技巧，對于C#程序開發有著很好的參考借鑒價值。具體分析如下：
一、屏蔽窗體右上角關閉按鈕
1.重寫OnClosing
protected override void OnClosing(CancelEventArgs e){ if(this.Visible) { e.Cancel=true; // // WHATE TODO // }}2.重寫WndProc
protected override void WndProc(ref Message m){const int WM_SYSCOMMAND = 0x0112;const int SC_CLOSE = 0xF060;if (m.Msg == WM_SYSCOMMAND && (int) m.WParam == SC_CLOSE){// User clicked close buttonthis.WindowState = FormWindowState.Minimized;return;}base.WndProc(ref m);}更多方法可以參考：
http://topic.csdn.net/u/20091220/21/5228d0d6-26aa-48b8-81aa-293f7c7339f8.html?94449
http://topic.csdn.net/u/20090419/18/970d8ad9-ed9a-4bd9-a623-81d23106545b.html
二、屏蔽CTRL-V
在WinForm中的TextBox控件沒有辦法屏蔽CTRL-V的剪貼板粘貼動作，如果需要一個輸入框，但是不希望用戶粘貼剪貼板的內容，可以改用RichTextBox控件，并且在KeyDown中屏蔽掉CTRL-V鍵，例子：
private void richTextBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e){if(e.Control && e.KeyCode==Keys.V)e.Handled = true;}三、應用程序單例運行
#region 單實例運行/// <summary>/// 單實例運行/// </summary>/// <param name="frm">所要運行的主窗體</param>public static void SingleRun(Form frm){ System.Threading.Mutex mutex = new System.Threading.Mutex(false,"SINGLE_INSTANCE_MUTEX"); if (!mutex.WaitOne(0, false)) { mutex.Close(); mutex = null; } if (mutex != null) { Application.Run(frm); } else { MessageBox.Show("應用程序已啟動","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information); }}#endregion四、將控件轉換成圓形
#region 將控件轉換為圓形 [System.Runtime.InteropServices.DllImport("gdi32")] private static extern IntPtr BeginPath(IntPtr hdc); [System.Runtime.InteropServices.DllImport("gdi32")] private static extern int SetBkMode(IntPtr hdc,int nBkMode); const int TRANSPARENT=1; [System.Runtime.InteropServices.DllImport("gdi32")] private static extern IntPtr EndPath(IntPtr hdc); [System.Runtime.InteropServices.DllImport("gdi32")] private static extern IntPtr PathToRegion(IntPtr hdc); [System.Runtime.InteropServices.DllImport("gdi32")] private static extern int Ellipse(IntPtr hdc,int x1,int y1,int x2,int y2); [System.Runtime.InteropServices.DllImport("user32")] private static extern IntPtr SetWindowRgn(IntPtr hwnd,IntPtr hRgn,bool bRedraw); [System.Runtime.InteropServices.DllImport("user32")] private static extern IntPtr GetDC(IntPtr hwnd); /// <summary> /// 將控件轉為圓形 /// </summary> /// <param name="control">控件名</param> public static void MakeControlToCircle(Control[] control) { IntPtr dc; IntPtr region; for(int i=0;i<control.Length;i++) { dc=GetDC(control[i].Handle); BeginPath(dc); SetBkMode(dc,TRANSPARENT); Ellipse(dc,0,0,control[i].Width-3,control[i].Height-2); EndPath(dc); region=PathToRegion(dc); SetWindowRgn(control[i].Handle,region,false); } } #endregion五、在同一應用程序中同一窗體只打開一個
/// <summary>/// 在同一應用程序中同一窗體只打開一個/// </summary>/// <param name="frmOpen">要打開的窗體實例</param>/// <returns></returns>public static void OpenSeamForm(Form frmOpen){ foreach (Form frm in Application.OpenForms) { if (frm.Text == frmOpen.Text) { frm.Visible = true; frm.WindowState = FormWindowState.Normal; frm.Activate(); return; } } frmOpen.Show();}相信本文所述實例對大家WinForm程序設計可以帶來很大幫助。
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