MethodInvoker synthesizes arguments not provided?

[stephentoub]

I was expecting this to throw an exception:

using System.Reflection;

internal class Program
{
    private static void Main()
    {
        var invoker = MethodInvoker.Create(typeof(Program).GetMethod("MyMethod", BindingFlags.NonPublic | BindingFlags.Static)!);
        invoker.Invoke(null);
    }

    static void MyMethod(int arg0, int arg1, int arg2) => Console.WriteLine($"{arg0} {arg1} {arg2}");
}

since the method has three non-optional parameters and zero arguments are being supplied, but instead it printed:

0 0 0

Is that by design?

Tagging subscribers to this area: @dotnet/area-system-reflection
See info in area-owners.md if you want to be subscribed.

Issue Details

---

I was expecting this to throw an exception:

using System.Reflection;

internal class Program
{
    private static void Main()
    {
        var invoker = MethodInvoker.Create(typeof(Program).GetMethod("MyMethod", BindingFlags.NonPublic | BindingFlags.Static)!);
        invoker.Invoke(null);
    }

    static void MyMethod(int arg0, int arg1, int arg2) => Console.WriteLine($"{arg0} {arg1} {arg2}");
}

since the method has three non-optional parameters and zero arguments are being supplied, but instead it printed:

0 0 0

Is that by design?

Author:	stephentoub
Assignees:	-
Labels:	area-System.Reflection
Milestone:	-

[jkotas]

Is that by design?

This looks like a bug to me. @steveharter ?

[steveharter]

Fixed with #90119