Add a splash screen to a program in C # and allow only one application instance to run

1, Start screen class: Public classSplashForm:System.Windows.Forms.Form {PrivateSystem.Windows.Forms.PictureBox PictureBox1; PrivateSystem.Windows.Forms.Label Label1; PrivateSystem.Windows.Forms.Label lbl_version; /// <summary>        ///the required designer variables. /// </summary>        PrivateSystem.ComponentModel.Container components =NULL;  PublicSplashform () {//            //The Windows Forms Designer supports the required//InitializeComponent (); Lbl_version. Text="version:"+application.productversion; //            //TODO: Add any constructor code after the InitializeComponent call//        }        //the following ellipsis2, Application Load class:usingSystem;usingSystem.Drawing;usingSystem.Collections;usingSystem.ComponentModel;usingSystem.Windows.Forms;usingSystem.Data;usingSystem.Runtime.InteropServices;usingSystem.Diagnostics;usingSystem.Reflection;usingSystem.IO;namespaceHeroic.TempAnalyse.TempGui {/// <summary>     ///a summary description of the Apploader. /// </summary>      Public classApploader {Private StaticApplicationContext context; Private StaticSplashform sform =NewSplashform (); Private StaticMainWindow Mform =NULL; //0 not visible but still running, 1 centered, 2 minimized, 3 maximized        Private Const intWs_shownormal =3; [STAThread]Static voidMain (string[] args) {                  //[8/12/2004] used to update the program. Doupdata (); //[7/19/2004] Change the order to start loading faster//get a running routineProcess instance =runninginstance (); if(Instance = =NULL) {sform.show (); Mform=NewMainWindow (); Context=NewApplicationContext (); Application.idle+=NewEventHandler (Onappidle);             Application.Run (context); }             Else             {                 //routines for processing discoveriesHandlerunninginstance (instance); //MessageBox.Show ("The current program is already running!");            }         }         //online update with, no longer this article scope        Private Static voidDoupdata () {System.Diagnostics.Process.Start (Application.startuppath+@"\update.exe", application.startuppath+@"\heroic.tempanalyse.tempgui.exe 0");//                }        Private Static voidOnappidle (Objectsender, EventArgs e) {             if(Context. MainForm = =NULL) {Application.idle-=NewEventHandler (Onappidle);                 Mform.preload (); Context. MainForm=Mform; Context.                         Mainform.show ();                         Sform.close (); Sform=NULL; }           }         //Two programs are not allowed to start at the same time         Public Staticprocess Runninginstance () {Process current=process.getcurrentprocess (); Process[] Processes=Process.getprocessesbyname (current.             ProcessName); //traverse a routine that is running with the same name            foreach(Process processinchprocesses) {                 //Ignore existing routines                if(Process. Id! =Current . Id) {//Make sure routines run from EXE file                    if(Assembly.getexecutingassembly (). Location.replace ("/","\\") ==Current . Mainmodule.filename) {//returns another instance of a routine                        returnprocess; }                 }             }             //no other routines, return null            return NULL; }          Public Static voidHandlerunninginstance (Process instance) {//ensure that the window is not minimized or maximizedShowwindowasync (instance.             Mainwindowhandle, Ws_shownormal); //set the real routine to foreground windowSetForegroundWindow (instance.         Mainwindowhandle); } [DllImport ("User32.dll")]         Private Static extern BOOLShowwindowasync (IntPtr hWnd,intcmdshow); [DllImport ("User32.dll")]Private Static extern BOOLSetForegroundWindow (IntPtr hWnd); } }3, load the class after the formal run: Public voidpreload () {//if it is already loaded, it returns            if(_loaded)return; //Put the machine-generated code here.Initcustomcontrol (); _loaded=true; }        //is loading complete        Private BOOL_loaded =false; protected Override voidOnLoad (EventArgs e) {//make sure that the preload () function has been called            if(!_loaded)Throw NewInvalidOperationException ("must call preload before calling this function."); }

C # can only run one WinForm process [STAThread]Static voidMain () {Process instance=runninginstance (); if(Instance = =NULL) {System.Windows.Forms.Application.EnableVisualStyles (); //These two lines allow the form to have XP-style.System.Windows.Forms.Application.DoEvents (); Application.Run (Newclientform ()); }            Else{handlerunninginstance (instance); }   }#regionRun only one instance Public Staticprocess Runninginstance () {Process current=process.getcurrentprocess (); Process[] Processes=Process.getprocessesbyname (current. ProcessName); //traverse a list of processes with the same name as the current processforeach(Process processinchprocesses) { //Ignore The current processif(Process. Id! =Current . Id) {//Make sure, the process is running from the exe file.if(Assembly.getexecutingassembly (). Location.replace ("/","\\") ==Current . Mainmodule.filename) {//Return The other process instance.returnprocess;} } } return NULL; } Private Static voidHandlerunninginstance (Process instance) {MessageBox.Show ("the application system is already running! ","Prompt Information", messageboxbuttons.ok,messageboxicon.information); Showwindowasync (instance. Mainwindowhandle,ws_shownormal); //Call API function, normal display windowSetForegroundWindow (instance. Mainwindowhandle);//places the window at the front. } [DllImport ("User32.dll")] Private Static extern BOOLShowwindowasync (System.IntPtr hWnd,intcmdshow); [DllImport ("User32.dll")] Private Static extern BOOLSetForegroundWindow (System.IntPtr hWnd);Private Const intWs_shownormal =1; #endregion 

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Add a splash screen to a program in C # and allow only one application instance to run