C# dev skill lesson plans for the next 2 weeks.

1. anonymous method & delegate

2. LINQ

3. lamda expression

4. extension method

5. query expression

 

this time, focus on anonymous method & delegate.

delegate

1. delegate's signature consists of parameters and return type.

2. each method which matches delegate's signature can be assigned to the delegate.

3. covariance allows delegate defining a general return type and one method which has matched the signature and more derived return type can be assigned to it, yet contravariance allows defining a general parameter type when declaring delegate.

4.generic delegate can be used with typical design patterns

 

anonymous method

1. essentially a way pass code block as delegate parameter, reducing the unnecessary overhead.