WinForm中的几个实用技巧汇总
本文汇总了几个WinForm中常见的实用技巧,对于C#程序开发有着很好的参考借鉴价值。具体分析如下:
一、屏蔽窗体右上角关闭按钮
1.重写OnClosing
protectedoverridevoidOnClosing(CancelEventArgse) { if(this.Visible) { e.Cancel=true; // //WHATETODO // } }
2.重写WndProc
protectedoverridevoidWndProc(refMessagem) { constintWM_SYSCOMMAND=0x0112; constintSC_CLOSE=0xF060; if(m.Msg==WM_SYSCOMMAND&&(int)m.WParam==SC_CLOSE) { //Userclickedclosebutton this.WindowState=FormWindowState.Minimized; return; } base.WndProc(refm); }
更多方法可以参考:
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控件没有办法屏蔽CTRL-V的剪贴板粘贴动作,如果需要一个输入框,但是不希望用户粘贴剪贴板的内容,可以改用RichTextBox控件,并且在KeyDown中屏蔽掉CTRL-V键,例子:
privatevoidrichTextBox1_KeyDown(objectsender,System.Windows.Forms.KeyEventArgse) { if(e.Control&&e.KeyCode==Keys.V) e.Handled=true; }
三、应用程序单例运行
#region单实例运行 ///<summary> ///单实例运行 ///</summary> ///<paramname="frm">所要运行的主窗体</param> publicstaticvoidSingleRun(Formfrm) { System.Threading.Mutexmutex=newSystem.Threading.Mutex(false,"SINGLE_INSTANCE_MUTEX"); if(!mutex.WaitOne(0,false)) { mutex.Close(); mutex=null; } if(mutex!=null) { Application.Run(frm); } else { MessageBox.Show("应用程序已启动","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")] privatestaticexternIntPtrBeginPath(IntPtrhdc); [System.Runtime.InteropServices.DllImport("gdi32")] privatestaticexternintSetBkMode(IntPtrhdc,intnBkMode); constintTRANSPARENT=1; [System.Runtime.InteropServices.DllImport("gdi32")] privatestaticexternIntPtrEndPath(IntPtrhdc); [System.Runtime.InteropServices.DllImport("gdi32")] privatestaticexternIntPtrPathToRegion(IntPtrhdc); [System.Runtime.InteropServices.DllImport("gdi32")] privatestaticexternintEllipse(IntPtrhdc,intx1,inty1,intx2,inty2); [System.Runtime.InteropServices.DllImport("user32")] privatestaticexternIntPtrSetWindowRgn(IntPtrhwnd,IntPtrhRgn,boolbRedraw); [System.Runtime.InteropServices.DllImport("user32")] privatestaticexternIntPtrGetDC(IntPtrhwnd); ///<summary> ///将控件转为圆形 ///</summary> ///<paramname="control">控件名</param> publicstaticvoidMakeControlToCircle(Control[]control) { IntPtrdc; IntPtrregion; for(inti=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、在同一应用程序中同一窗体只打开一个
///<summary> ///在同一应用程序中同一窗体只打开一个 ///</summary> ///<paramname="frmOpen">要打开的窗体实例</param> ///<returns></returns> publicstaticvoidOpenSeamForm(FormfrmOpen) { foreach(FormfrminApplication.OpenForms) { if(frm.Text==frmOpen.Text) { frm.Visible=true; frm.WindowState=FormWindowState.Normal; frm.Activate(); return; } } frmOpen.Show(); }
相信本文所述实例对大家WinForm程序设计可以带来很大帮助。