I know this isn't Haskell OR C#, but XSLT comes to mind. That might be a cleaner alternative than affecting either the way Haskell or C# serializes or deserializes. On 3/12/2018 6:06 PM, Clinton Mead wrote:

Hi All

I want to integrate Haskell into an existing C# project, initially by creating one C# class that basically does all it's "work" in Haskell (and just provides a C# interface).

There will be a few types passed in and out of this Haskell module from/to C#. On the C# side, there are classes with members, who's types are probably going to be either Strings, Ints, or lists of Strings/Ints, or lists of other objects.

I'd like to have the same types on the Haskell side.

It would be nice if I could just magically pass one of these C# types to Haskell and on the Haskell side it will appear as a Haskell type

I assume what I'll have to do is serialise the type on the C# side and deserialise on the Haskell side.

C# allows one to serialise any data type to XML. Haskell has plenty of serialisation libraries as well.

However, the problem I presume is that if I just serialise to XML on the C# side, and deserialise from XML on the Haskell side, if my types are just slightly different, or even if the exact serialisers/deserialises represent their data in different ways, it isn't going to work.

It seems like passing complex data to/from Haskell may be a common problem other people experience, so I'm looking for any suggestions on a clean way of doing this.

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You could use protocol buffers: https://developers.google.com/protocol-buffers/docs/csharptutorial You would specify the data types you need in an independent language, then use a code generator to get C# classes and Haskell records, and serializers for free. On the Haskell side you can use https://hackage.haskell.org/package/proto-lens. Then you can send the serialized objects over FFI or the network as needed. On Tue, Mar 13, 2018 at 12:06 AM, Clinton Mead wrote:

Hi All

I want to integrate Haskell into an existing C# project, initially by creating one C# class that basically does all it's "work" in Haskell (and just provides a C# interface).

There will be a few types passed in and out of this Haskell module from/to C#. On the C# side, there are classes with members, who's types are probably going to be either Strings, Ints, or lists of Strings/Ints, or lists of other objects.

I'd like to have the same types on the Haskell side.

It would be nice if I could just magically pass one of these C# types to Haskell and on the Haskell side it will appear as a Haskell type

I assume what I'll have to do is serialise the type on the C# side and deserialise on the Haskell side.

C# allows one to serialise any data type to XML. Haskell has plenty of serialisation libraries as well.

However, the problem I presume is that if I just serialise to XML on the C# side, and deserialise from XML on the Haskell side, if my types are just slightly different, or even if the exact serialisers/deserialises represent their data in different ways, it isn't going to work.

It seems like passing complex data to/from Haskell may be a common problem other people experience, so I'm looking for any suggestions on a clean way of doing this.

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