How to define my own main method in WPF

Question

I would like to override orignal main method in WPF.

I want add content at the beginnig of the origina main method. How to do it?

It seems that it has to be done in App.xaml.cs file, but still don't know how to achieve it.

Answer 1

I don't believe you can, directly. The designer introduces its own Main method.

What you can do is create your own separate class with a Main method, which in turn calls App.Main when you want to:

using System;

namespace AppWithCustomMain
{
    class CustomMain
    {
        [STAThread]
        static void Main()
        {
            Console.WriteLine("CustomMain!");
            App.Main();
        }
    }
}

Then set the "startup object" build setting in your project properties to CustomMain, and it should call your Main method first, which in turn calls into App.Main.

This is assuming you really need to get in before anything else, however. Normally you'd just either subscribe to the Application.Startup event, or override Application.OnStartup within your Application subclass.

Answer 2

You can introduce a new Run()-method in your App class (yes, you're right - it has to be done inside the App.xaml.cs - , make your stuff and then call the base implementation:

public partial class App : Application
{
    public new void Run()
    {
        // Do your stuff here

        // Call the base method
        base.Run();
    }
}

Answer 3

You shouldn't really override the main method of the application, if you want to call a specific method when your application starts up, you can override the OnStartup method of the App class (file App.xaml.cs).

Here's an example:

/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        // Your code here
    }
}