How do I get the IL of Expression.Compile()
Is there a way to display the IL of Expression.Compile() result - the lambda_xxx method?
Comments
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I believe this is being implemented in .NET 9 (although we are still lacking CompileToMethod):
https://github.com/dotnet/runtime/issues/15704It's possible that you might find a third-party library that accomplishes this.
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would it be possible for the LinqPad's Disassemble extension method on MethodBase to be used for that and use this il-visualizer libary?
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That library targets .NET Framework 4 and reflects over private fields to extract the IL from the DynamicMethod's ILGenerator. I'm not sure how robust this strategy is. You can do something similar yourself:
Expression<Func<int, int, int>> foo = (x, y) => x + y; var m = (DynamicMethod) foo.Compile().GetMethodInfo(); var gen = m.GetILGenerator().Dump(); byte[] il = gen.Uncapsulate().m_ILStream; il.Dump();
From there, you could invoke a disassembler on the IL, or use the sample I wrote for C# in a Nutshell:
https://www.albahari.com/nutshell/E12-CH18.aspxHere's a complete example.
https://share.linqpad.net/re5lasah.linq -
Thanks a lot!
I am getting "InvalidCastException: Unable to cast object of type 'RTDynamicMethod' to type 'System.Reflection.Emit.DynamicMethod'."
for both .NET 6 and .NET7 (saw that the query you had was targetting .NET9)
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is this a valid way to go around the error ?
var method = (DynamicMethod)expr.Compile().GetMethodInfo().Uncapsulate().m_owner;
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It works, the only missing thing is of course the tokens are not represented as strings.
