On Tuesday, 8 March 2016 22:39:28 UTC, Benjamin Krämer wrote:
>
> I have ported the MessageDifferencer from C++ to C# since I need to look 
> for changes in various protos. The only thing missing is the unpacking of 
> the Any messages.
>
> Therefore I would like to get a descriptor for which I know the name and 
> which is also compiled into the application. In C++, I can use the 
> DynamicMessageFactory or look it up with DescriptorPool::generated_pool(). 
> It seems, like there is no generated or central pool in C#.
>

Indeed there isn't. It's not clear to me at what point messages would get 
registered - after all, a new assembly with extra messages could be loaded 
at any point.
 

> Each FileDescriptor seems to have it's own DescriptorPool containing only 
> it's own descriptor with it's dependencies. Also the DependencyPool in C# 
> is internal and the only way to access it seems to use the FindTypeByName 
> method of the FileDescriptor.
>
> Is it somehow possible to get the descriptor in C# or do I have to 
> aggregate the DescriptorPool by myself?
>

If you mean the descriptor proto - no, that's deliberately internal as it's 
a proto2 message; we know we don't modify it within the Google.Protobuf 
library, and have investigated all the differences in behaviour - basically 
we treat it as a proto3 message, with care. We definitely don't want to 
expose that to callers.

Jon

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