Asp.Net Core 3 如何在 program.cs 文件中放入 function - 修饰符“private”对此项目无效

Question

The November 2021 release of AspNet Core 3 has a Program.cs file without any methods, you simply configure the services.

app.UseDefaultFiles();
app.UseStaticFiles();

app.Run();

However, if you need to add a method, eg:

public Task OnFallbackAsync(DelegateResult<HttpResponseMessage> response, Context context)
{
    Console.WriteLine("About to call the fallback action. This is a good place to do some logging");
    return Task.CompletedTask;
}

You get an error:

The modifier 'public' is not valid for this item

How to declare functions in the Program.cs file?

Answer 1

The solution is to remove the scope keyword (Private, Internal, Public):

app.UseDefaultFiles();
app.UseStaticFiles();

app.Run();
    
Task OnFallbackAsync(DelegateResult<HttpResponseMessage> response, Context context)
{
    Console.WriteLine("About to call the fallback action. This is a good place to do some logging");
    return Task.CompletedTask;
}