How to force inline functions in C#? [duplicate]

Question

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Inline functions in C#?

In c++ we can force function inlining.

Is this also possible in c#? sometimes, and when the method is small, it gets inlined automatically. But is it possible force inlining functions in c#/.Net?

Answer 1

Sort of. It's not under your direct control to turn on for sure. It's never inlined in the IL - it's only done by the JIT.

You can explicitly force a method to not be inlined using MethodImplAttribute

[MethodImpl(MethodImplOptions.NoInlining)] public void Foo() { ... } 

You can also sort of "request" inlining as of .NET 4.5:

[MethodImpl(MethodImplOptions.AggressiveInlining)] public void Foo() { ... } 

... but you can't force it. (Prior to .NET 4.5, that enum value didn't exist. See the .NET 4 documentation, for example.)