[C#]確保程式只有一個Instance

在Survey Performance找到的資料.... Copy & Paste 如下





确保程序只有一个实例在运行(C#) - Felix Woo

using System.Threading
using System.Runtime.InteropServices;

public class Form1 : Form
{
[STAThread]
static void Main()
{
bool createdNew;

Mutex m = new Mutex(true, "YourAppName", out createdNew);

if (! createdNew)
{
// app is already running...
MessageBox.Show("Only one instance of this application is allowed at a time.");
return;
}

Application.Run(new Form1());

// keep the mutex reference alive until the normal termination of the program
GC.KeepAlive(m);
}
}



另外 要foreground exising one的話 code below

f your application can run with Full Trust permissions, we can take
this a step further and find the window of the application instnace
already running and bring it to the front for the user:



public class Form1 : Form

{

[STAThread]

static void Main()

{

bool createdNew;



System.Threading.Mutex m = new System.Threading.Mutex(true, "YourAppName", out createdNew);



if (! createdNew)

{

// see if we can find the other app and Bring it to front

IntPtr hWnd = FindWindow("WindowsForms10.Window.8.app3", "YourAppName");



if(hWnd != IntPtr.Zero)

{

Form1.WINDOWPLACEMENT placement = new Form1.WINDOWPLACEMENT();

placement.length = Marshal.SizeOf(placement);



GetWindowPlacement(hWnd, ref placement);



if(placement.showCmd != SW_NORMAL)

{

placement.showCmd = SW_RESTORE;



SetWindowPlacement(hWnd, ref placement);

SetForegroundWindow(hWnd);

}

}



return;

}

Powered by ScribeFire.