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"TypeError: No method matches given arguments" error for a virtual method with a template parameter #1522

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rayrapetyan opened this issue Aug 19, 2021 · 2 comments · Fixed by #1657
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"TypeError: No method matches given arguments" error for a virtual method with a template parameter #1522

rayrapetyan opened this issue Aug 19, 2021 · 2 comments · Fixed by #1657
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@filmor
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bug
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3.0.0

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@rayrapetyan
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rayrapetyan commented Aug 19, 2021 •
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Environment

Details

Trying to re-implement example from here using Python.

Everything works fine except this line of code:

    slideMasterPart1.AddPart(slideLayoutPart1, "rId1");

There are two definitions of AddPart:

    public virtual T AddPart<T>(T part)  where T : OpenXmlPart
    public virtual T AddPart<T>(T part, string id)  where T : OpenXmlPart

slideMasterPart1.AddPart.Overloads output:

T AddPart[T](T)
T AddPart[T](T, System.String)

What works:

    slideMasterPart1.AddPart(slideLayoutPart1)
    slideMasterPart1.AddPart[SlideLayoutPart](slideLayoutPart1)

What doesn't work:

    slideMasterPart1.AddPart(slideLayoutPart1, "rId1")
    slideMasterPart1.AddPart(slideLayoutPart1, System.String("rId1"))
    slideMasterPart1.AddPart[SlideLayoutPart](slideLayoutPart1, "rId1")

Error:

Python.Runtime.PythonException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T

The above exception was the direct cause of the following exception:

System.ArgumentException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T in method T AddPart[T](T, System.String) ---> Python.Runtime.PythonException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T
   --- End of inner exception stack trace ---

The above exception was the direct cause of the following exception:

System.AggregateException: One or more errors occurred. (DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T in method T AddPart[T](T, System.String)) ---> System.ArgumentException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T in method T AddPart[T](T, System.String) ---> Python.Runtime.PythonException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
---> (Inner Exception #0) System.ArgumentException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T in method T AddPart[T](T, System.String) ---> Python.Runtime.PythonException: DocumentFormat.OpenXml.Packaging.SlideLayoutPart value cannot be converted to T
   --- End of inner exception stack trace ---<---

The above exception was the direct cause of the following exception:
...
slideMasterPart1.AddPart(slideLayoutPart1, "rId1");
TypeError: No method matches given arguments for AddPart: (<class 'DocumentFormat.OpenXml.Packaging.SlideLayoutPart'>, <class 'str'>)

mcve:

import clr

clr.AddReference('DocumentFormat.OpenXml')

from DocumentFormat.OpenXml.Packaging import (
    SlideLayoutPart,
    SlideMasterPart,
)

slideLayoutPart1: SlideLayoutPart = SlideLayoutPart()
slideMasterPart1: SlideMasterPart = SlideMasterPart()
slideMasterPart1.AddPart(slideLayoutPart1)  # this works OK
slideMasterPart1.AddPart(slideLayoutPart1, "rId1")  # this raises a runtime exception

So it's only when the second (string) parameter is provided, the first can't be converted. Looks like a pythonnet issue.
@filmor
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filmor commented Sep 24, 2021

Thank you for the detailed report. I have looked into this, and I think the culprit is mixing of generic and non-generic parameters.

@filmor filmor added the bug label Sep 28, 2021
@filmor filmor added this to the 3.0.0 milestone Sep 28, 2021
@filmor filmor self-assigned this Sep 28, 2021
@LeeDongGeon1996
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Same issue with me. Is there any progress on this?

@LeeDongGeon1996 LeeDongGeon1996 mentioned this issue Dec 10, 2021
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lostmsu added a commit to losttech/pythonnet that referenced this issue Jan 4, 2022
@lostmsu
improved support for generic method overloading
36498bc 
Prior to this change if method had multiple generic overloads, only 1 of them could be matched (whichever one reflection would return first)

Now MethodBinder.MatchParameters returns all matching generic overloads, not just the first one.

fixes pythonnet#1522
@lostmsu lostmsu mentioned this issue Jan 4, 2022
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lostmsu added a commit that referenced this issue Jan 5, 2022
@lostmsu
improved support for generic method overloading
fabb22c 
Prior to this change if method had multiple generic overloads, only 1 of them could be matched (whichever one reflection would return first)

Now MethodBinder.MatchParameters returns all matching generic overloads, not just the first one.

fixes #1522
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Improved support for generic method overloading losttech/pythonnet
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