How to Create a Single-Instance WPF Application Using Mutexes?

C# wpf Single real example application

In C#, using WPF to create a single instance application requires a technology called mutually exclusive body. Mutual exclusion aims to ensure that only one application instance can be run at a time.

Understand the mutual reprimand

Mutual body acting as a seeker who acts as application resources. When the application creates a mutual reprimand, it actually "locks" these resources to prevent any other instances of the application from accessing them. This mechanism ensures that only one application instance can be performed at one time.

Create a single instance WPF application

To create a single instance WPF application, please follow the steps below: <.> 1. Development of mutual exclusive body:

In the application code, declare a static Mutex object.

The parameter specifies that the mutually exclusive body is initially owned by the application. The string parameter is the unique identifier of the mutually exclusive body. This identifier ensures that no other applications can use the same mutual body.

<.> 2. Check the mutually exclusive body ownership:

true

When the application starts, use the

static Mutex mutex = new Mutex(true, "{8F6F0AC4-B9A1-45fd-A8CF-72F04E6BDE8F}");

method to check whether it has mutual exclusion. If this method returns , it means that the application is the first instance that can continue to be executed. If is returned, it means another instance is already running.

<.> 3. Notify the existing example:

WaitOne() If the application is not the first instance, use the true function to send a custom message to notify the start -up attempt of the running instance of the second instance. false

if (mutex.WaitOne(TimeSpan.Zero, true))
{
    // 应用程序的第一个实例
}
else
{
    // 第二个实例，通知第一个实例并退出
}

<.> 4. Treatment of custom message:

In running instances, the custom message is processed by rewriting the

method of the main window.

PostMessage()

<.> 5. Show the instance that is running:

NativeMethods.PostMessage(
    (IntPtr)NativeMethods.HWND_BROADCAST,
    NativeMethods.WM_SHOWME,
    IntPtr.Zero,
    IntPtr.Zero);

When the running instance receives a custom message, you can use the method to place it on the front desk.

WndProc By performing these steps, you can create a single instance WPF application to ensure that only one application instance is in active at a time.

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