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Implement BindingFlags.DoNotWrapExceptions on Project N #4437

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1 commit merged into from Aug 31, 2017
Merged

Implement BindingFlags.DoNotWrapExceptions on Project N #4437

1 commit merged into from Aug 31, 2017

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@ghost ghost commented Aug 31, 2017

This was approved here.

https://github.com/dotnet/corefx/issues/22866

Ok, this one actually makes the feature work. Turned
out not to be too hard.

There are a couple of drive-by items being done here:

  • Since the other Invoke overload on MethodInvoker
    was only for its use, downgraded its visibility.

  • Moved the catch in InvokeUtilites before the finally
    that copies back arguments. We don't want to wrap
    any exceptions out of the argument post-processing
    steps.

This was approved here.

https://github.com/dotnet/corefx/issues/22866

Ok, this one actually makes the feature work. Turned
out not to be too hard.

There are a couple of drive-by items being done here:

- Since the other Invoke overload on MethodInvoker
  was only for its use, downgraded its visibility.

- Moved the catch in InvokeUtilites before the finally
  that copies back arguments. We don't want to wrap
  any exceptions out of the argument post-processing
  steps.
@ghost ghost merged commit 13ea6e4 into dotnet:nmirror Aug 31, 2017
@ghost ghost deleted the bfimpl branch Aug 31, 2017
akoeplinger pushed a commit to mono/mono that referenced this issue Mar 29, 2018
The original design review is here: dotnet/corefx#22866 . To summarize, this adds a new flag to `BindingFlags` called `DoNotWrapExceptions`. When this flag is used to invoke a method using reflection, any exceptions thrown are not wrapped with a `TargetInvocationException`.

It has already been implemented in some other version of .NET:
- dotnet/corert#4437
- dotnet/coreclr#13767

I would be delighted if this handy feature was also available in Mono.

I have in part based my changes on the CoreCLR implementation. There all already tests for this feature in corefx, so I have added those to the corlib_xtest.dll.sources file.

I have a couple of concerns about my implementation:
- I notice that `DynamicMethod.Invoke` was ignoring the BindingFlags and other arguments. I changed this method to pass along all the arguments. For what it's worth, it appears that [CoreCLR respects](https://github.com/dotnet/coreclr/blob/master/src/mscorlib/src/System/Reflection/Emit/DynamicMethod.cs#L488) these arguments.
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