[Python.NET] issue disambiguating overloaded method that takes an array

[Adrian Perez]

Hello everyone,

This is probably a total n00b question, but I've been using pythonnet in our toolchain to communicate with a private c# assembly for months now without ever running into a problem I couldn't eventually figure out.  This one has me totally stumped, and I'm hoping something obvious will jump out at experienced eyes.

(I did a find/replace for secrecy, besides silly names these are the raw results I get back)

A C# class exposes a method 'WriteByte' that has 5 overloads (note that only one of them takes 2 arguments):

>>> accessor= MyCompany.SomeNamespace.SomeTypeArrayAccessor
>>> accessor.WriteByte.__overloads__
Boolean WriteByte(MyCompany.SomeNamespace.SomeType, Byte[])
Boolean WriteByte(MyCompany.SomeNamespace.SomeType, Byte[], Int32 ByRef)
Boolean WriteByte(MyCompany.SomeNamespace.SomeType, System.Collections.Generic.IEnumerable`1[System.Byte], Int32 ByRef)
Boolean WriteByte(MyCompany.SomeNamespace.SomeType, Int32, System.Collections.Generic.IEnumerable`1[System.Byte], Int32 ByRef)
Boolean WriteByte(MyCompany.SomeNamespace.SomeType, Int32, Byte[], Int32 ByRef)

I attempt to disambiguate by selecting the 2-arg method I want by type:

>>> desired_method= accessor.WriteByte.__overloads__[MyCompany.SomeNamespace.SomeType, System.Array[System.Byte]]

The problem may be right here - if I print out desired_method.__doc__ I get the same 5 methods listed above.  Anyway, then I compute my arguments, and can verify they have the types I expect (If it matters, arg_b is created by a call to System.IO.BinaryReader.ReadBytes()):

>>> arg_a= ...
>>> arg_b= ...
>>> type(arg_a)
<class 'MyCompany.SomeNamespace.SomeType'>
>>> type(arg_b)
<class 'System.Byte[]'>

However, when I try to call the disambiguated method with the correct args, I get no love:

>>> result= desired_method(arg_a, arg_b)
Traceback (most recent call last):
  File "<string>", line 1, in <fragment>
TypeError: No method matches given arguments

Does anyone see the obvious thing I'm doing wrong?  Disambiguating can be a pain but I've done it before for other methods and have never had such an impossible time getting the correct method called. 

Thanks,

Adrian Perez