保证应用程序只有一个实例在运行

[C#]

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;

}

[VB.NET]

Public Shared Function RunningInstance() As Process

Dim current As Process = Process.GetCurrentProcess()

Dim processes As Process() = Process.GetProcessesByName(current.ProcessName)

'Loop through the running processes in with the same name

Dim process As Process

For Each process In processes

'Ignore the current process

If process.Id <> current.Id Then

'Make sure that the process is running from the exe file.

If [Assembly].GetExecutingAssembly().Location.Replace("/", "/") = current.MainModule.FileName Then

'Return the other process instance.

Return process

End If

End If

Next process

'No other instance was found, return null.

Return Nothing

End Function 'RunningInstance

如果检测到已有窗体实例,将此实例显示出来参考:

[STAThread]

static void Main()

{

//Get the running instance.

Process instance = RunningInstance();

if (instance == null)

{

//There isn't another instance, show our form.

Application.Run (new Form2());

}

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 

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