一、屏蔽窗体右上角*按钮
1.重写OnClosing
protected override void OnClosing(CancelEventArgs e) { if(this.Visible) { e.Cancel=true; // // WHATE TODO // } }
2.重写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 button this.WindowState = FormWindowState.Minimized; return; } base.WndProc(ref m); }
更多要领可以参考：
二、屏蔽CTRL-V
在WinForm中的TextBox控件没有步伐屏蔽CTRL-V的剪贴板粘贴行动，如果需要一个输入框，但是不但愿用户粘贴剪贴板的内容，可以改用RichTextBox控件，并且在KeyDown中屏蔽失CTRL-V键，例子：
private void richTextBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { if(e.Control && e.KeyCode==Keys.V) e.Handled = true; }
三、应用措施单例运行
#region 单实例运行 /// <summary> /// 单实例运行 /// </summary> /// <param>所要运行的主窗体</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("应用措施已启动","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information); } } #endregion
四、将控件转换成圆形
#region 将控件转换为圆形 [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> /// 将控件转为圆形 /// </summary> /// <param>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、在同一应用措施中同一窗体只打开一个
/// <summary> /// 在同一应用措施中同一窗体只打开一个 /// </summary> /// <param>要打开的窗体实例</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(); }
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