Are delegate keywords and lambda notation functionally identical in C#?

Delegate Keyword vs. Lambda Notation

In C#, a common question arises regarding the equivalence of two lambda expressions:

<code class="csharp">delegate { x = 0; }

() = > { x = 0 }</code>

Are they functionally identical once compiled?

Answer:
In short, no. They are syntactically equivalent, but differ in the resulting delegate type.

Delving Deeper:
While the delegate keyword traditionally creates anonymous delegates, using a lambda with the delegate keyword results in an anonymous delegate as well. However, assigning a lambda to an Expression type creates an expression tree instead, which can subsequently be compiled to an anonymous delegate.

Advanced Considerations:
The choice between these notations depends on the intended usage:

• Assign to Delegate Type (e.g., Func, Action): Use anonymous delegates for runtime code generation.
• Assign to Expression Type: Use expression trees for deferred execution or customized code generation.

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