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I am wondering if I can use extension method or other techniques to extend static class like
System.Net.Mime.MediaTypeNames.Image, it has fewer type than I need.
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An extension method must be a static method. An extension method must be inside a static class -- the class can have any name. The parameter in an extension method should always have the "this" keyword preceding the type on which the method needs to be called.
The only difference between a regular static method and an extension method is that the first parameter of the extension method specifies the type that it is going to operator on, preceded by the this keyword.
In C#, the extension method concept allows you to add new methods in the existing class or in the structure without modifying the source code of the original type and you do not require any kind of special permission from the original type and there is no need to re-compile the original type.
No, we can't. No, It's not possible to inherit Static class. Static classes are sealed classes so we can't inherit that.
No, extension methods can only be used to add instance methods, not static methods (or even properties). Extension methods are really just syntactic sugar around static methods. For instance, when you use an extension method such as Count():
var list = GetList();
var size = list.Count();
This is actually compiled to:
var list = GetList();
var size = Enumerable.Count(list);
You can't add additional static methods to an existing class using extension methods.
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