Where's the Main() Method in WPF?

WPF's Discrepancy from Traditional Main() Method

In programming, one of the fundamental concepts is the existence of a Main() method that serves as the starting point of a program's execution. However, when creating a WPF (Windows Presentation Foundation) project, a beginner might be surprised to find that there is no visible Main() method. This raises the question: Is Main() absent in WPF or merely disguised under a different name?

The Absence of a User-Defined Main()

Unlike other programming languages where a Main() method is explicitly defined by the developer, in WPF, the Main() method is automatically generated by the development environment. This hidden Main() method is responsible for initializing and running the WPF application.

Creating a Custom Main() Method

While the automatic Main() method is sufficient for most scenarios, there may be situations where you desire to define your own Main() method in WPF. To do so:

1. Right-click the App.xaml file in the solution explorer and select "Properties."
2. Change the "Build Action" from "ApplicationDefinition" to "Page."
3. Add a Main() method to the App.xaml.cs file.

Example of a Custom Main() Method

Below is an example of a custom Main() method that you can add to your WPF project:

[STAThread]
public static void Main()
{
    var application = new App();
    application.InitializeComponent();
    application.Run();
}

By defining your own Main() method, you gain the flexibility to customize the initialization and execution process of your WPF application.

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