Has more than one entry point defined error

c#, wpf

Solution

You have two primary options to implement on start activities:

Event handlers

File App.xaml

<Application x:Class="CSharpWPF.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml"
             Startup="Application_Startup">

Define `Startup="Application_Startup"` and handle in file App.xaml.cs:

    private void Application_Startup(object sender, StartupEventArgs e)
    {
        // On start stuff here
    }

Override method

File App.xaml.cs

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        // On start stuff here
        base.OnStartup(e);

        // Or here, where you find it more appropriate
    }
}

Problem

I have the following code: ``` namespace WpfApplication2 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MyWindow : Window { public MyWindow() { Width = 300; Height = 200; Title = "My Program Window"; Content = "This application handles the Startup event."; } } class Program { static void App_Startup(object sender, StartupEventArgs args) { MessageBox.Show("The application is starting", "Starting Message"); } [STAThread] static void Main() { MyWindow win = new MyWindow(); Application app = new Application(); app.Startup += App_Startup; app.Run(win); } } } ``` When I run this code, I get the following error: Error 1 Program 'c:...\WpfApplication2\WpfApplication2\obj\Debug\WpfApplication2.exe' has more than one entry point defined: 'WpfApplication2.Program.Main()'. Compile with /main to specify the type that contains the entry point. There isn't any "Program" file in my code as far as I see. How can I fix this?

Original source

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