a good blog about generic and constrain it with "where"

James M. Hare's blog about constraining generics with "where" clause

The blog is thorough. Store it for future reference.

To summarize some key syntaxs as below:

- constrains to an interface or a base class

public class MyClass<T> where T : IMyInterface<T>

- constrains to reference type

where T : class

- Constrain to value type

where T : struct

- Constrain to required consturctor

Where T: class, new()

"Basically, the where clause allows you to specify additional constraints on what the actual type used to fill the generic type placeholder must support." In another word, "if the type meets the given constraint, you can perform the activities that pertain to that constraint with the generic placeholders."

This empowers you to write less code across types. Less is more.