Expression-bodied function members efficiency and performance in C# 6.0

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In a new C# 6.0 we can define methods and properties using lambda expressions.

No, you can’t. You can define method and property bodies using syntax which looks like a lambda expression, in that it uses the token =>.

However, importantly this does not mean that there’s a delegate type involved. (Whereas a lambda expression is only permitted in a context where it’s converted to an expression tree or delegate type.)

This is purely syntactic sugar. Your two example code snippets will compile to the exact same IL. It’s just a different way of representing the body of a property getter or method.

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