Improve error reporting for dynamic method invocation via reflection

[Nefcanto]

When we invoke a method via reflection, in case something goes wrong with type matching we get this error:

Object does not match target type.

This is a very poor message for debugging. Please give us more information. Something like:

You wanted to invoke SomeMethod and you passed X of type XType with value XValue and Y with type YType. These types do not match with what SomeMethod expects as its parameters A of type AType and B of type BType.

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

Issue Details

---

When we invoke a method via reflection, in case something goes wrong with type matching we get this error:

Object does not match target type.

This is a very poor message for debugging. Please give us more information. Something like:

You wanted to invoke SomeMethod and you passed X of type XType with value XValue and Y with type YType. These types do not match with what SomeMethod expects as its parameters A of type AType and B of type BType.

Author:	Nefcanto
Assignees:	-
Labels:	area-System.Reflection, untriaged
Milestone:	-

[steveharter]

The request sounds reasonable; the proposed wording seems a little verbose. Maybe shorten to something like:

SomeMethod exists on type X but an object of type Y was passed.

It looks like the existing resource string "RFLCT_Targ_ITargMismatch" is used by the managed code in System.Reflection.MethodInvokerCommon and by runtime code in interoputil.cpp. To make this easier, we would likely create a new resource string for the managed code and leave the runtime\native code as-is.

[Nefcanto]

@steveharter, thank you so much.

[GustavoAdami]

@steveharter, I would like to take on this issue.

[RutulPatel8]

@Nefcanto or @steveharter
Can you please suggest how Can I debug runtime > Reflection code so I can fix this issue.
I tried lot but I didn't found the way.

[Nefcanto]

@RutulPatel8, create a simple class with a single method that takes one parameter which is a string.

Now reflect it and call that method, but pass it a list of integers. That's how.

[RutulPatel8]

@RutulPatel8, create a simple class with a single method that takes one parameter which is a string.

Now reflect it and call that method, but pass it a list of integers. That's how.

@Nefcanto Yes I know. how to reproduce this issue.
I'm talking about dotnet > Runtime > libraries > System.Reflection debugging.
Currently I clone runtime repository but I don't know which solution file needs to execute(debug) in runtime project.
In libraries, I found System.Reflection csProj but I think it is not right way to technique.

[Nefcanto]

@RutulPatel8, I apologize for my misunderstanding. I don't know about that part.