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

The correct method of building a single instance WPF application

In the development of .NET WPF, ensuring that the application can only run a single instance to understand the concept of mutual locking. Mutual locks (or mutually exclusive objects) are a synchronization mechanism that prevent multiple threads or processes from accessing shared resources at the same time.

To achieve a single -lye function, please follow the steps below:

Create a mutual lock

: Create a naming mutual lock object with a unique identifier. This will be used as a lock of accessing applications.
1. Check the existing instance : Before starting the application, use the
method to check whether the mutual lock is available. The return value is indicating a successful lock, and
2. indicates existing instances. Inform the existing example Mutex.WaitOne(): If there is an existing example, please use Win32 messages (through true) to send custom messages to activate the instance. Use to register the custom window message and cover the false to listen to the message.
3. Start the application : If the existing instance is not found, the application is launched normally, and the mutual lock is released when the application is closed. PostMessage() Treatment of the second instance RegisterWindowMessage(): When the second instance is activated, it will try to get a mutually lock, but it will fail. It should not display error messages, but should notify the existing examples and exit. WndProc()
4. Advanced skills
The article linking in this document provides a more advanced solution that combines the mutual lock method with the
5. method to ensure that only one instance is run. It also includes the function of placing existing instances on the front when the second instance attempts to start. code example PostMessage()

The following example how to use mutual locks to implement single instance functions:

Please note that Class is omitted here because it contains platform -related code. You need to achieve yourself according to your needs.

It also needs to be replaced with a unique identifier, such as the GUID of your application.

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