using System; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Diagnostics; using System.Reflection; public class OneInstnace { [STAThread] public static void Main() { //Get the running instance. Process instance = RunningInstance(); if (instance == null) { //There isn't another instance, show our form. Application.Run (new Form()); } else { //There is another instance of this process. HandleRunningInstance(instance); } } public static Process RunningInstance() { Process current = Process.GetCurrentProcess(); Process[] processes = Process.GetProcessesByName (current.ProcessName); //Loop through the running processes in with the same name foreach (Process process in processes) { //Ignore the current process if (process.Id != current.Id) { //Make sure that the process is running from the exe file. if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName) { //Return the other process instance. return process; } } } //No other instance was found, return null. return null; } public static void HandleRunningInstance(Process instance) { //Make sure the window is not minimized or maximized ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL); //Set the real intance to foreground window SetForegroundWindow (instance.MainWindowHandle); } [DllImport("User32.dll")] private static extern bool ShowWindowAsync( IntPtr hWnd, int cmdShow); [DllImport("User32.dll")] private static extern bool SetForegroundWindow(IntPtr hWnd); private const int WS_SHOWNORMAL = 1; }
http://xml.sz.luohuedu.net/xml/ShowDetail.asp?id=E2A17727-765F-4346-8446-5D130622CB54
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Diagnostics;
using System.Reflection; public class OneInstnace
{
[STAThread]
public static void Main()
{
//Get the running instance.
Process instance = RunningInstance();
if (instance == null)
{
//There isn't another instance, show our form.
Application.Run (new Form());
}
else
{
//There is another instance of this process.
HandleRunningInstance(instance);
}
}
public static Process RunningInstance()
{
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName (current.ProcessName);
//Loop through the running processes in with the same name
foreach (Process process in processes)
{
//Ignore the current process
if (process.Id != current.Id)
{
//Make sure that the process is running from the exe file.
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
{
//Return the other process instance.
return process;
}
}
}
//No other instance was found, return null.
return null;
}
public static void HandleRunningInstance(Process instance)
{
//Make sure the window is not minimized or maximized
ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL);
//Set the real intance to foreground window
SetForegroundWindow (instance.MainWindowHandle);
}
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync( IntPtr hWnd, int cmdShow);
[DllImport("User32.dll")] private static extern bool
SetForegroundWindow(IntPtr hWnd);
private const int WS_SHOWNORMAL = 1;
}