#554 – Rules for Matching an Anonymous Method to a Delegate Type

When you declare an anonymous method and assign it to a delegate type or pass it as a delegate-typed parameter, the anonymous method is converted to an instance of the appropriate delegate.  There are several rules that you must follow so that this conversion can happen properly.

  • You can only omit the formal parameter list in the anonymous method declaration if
    • The delegate type’s parameter list has no ref or out parameters
    • The body of the anonymous method does not need to read or write any of the parameters
  • If you include the formal parameter list in the anonymous method declaration, you must include all of the parameters and the type must match for each parameter
  • Any object returned as the return value of the anonymous method must be able to be implicitly converted to the return type of the delegate

About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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