What are some advantages to using an interface in C#?

Question

I was forced into a software project at work a few years ago, and was forced to learn C# quickly. My programming background is weak (Classic ASP).

I\'ve learned qui

Answer 1

The basic case is the "IWriter" case.

Suppose you are making a class that can write to the console, and it has all kinds of useful functions like write() and peek().

Then you would like to write a class that can write to the printer, so instead of reinventing a new class, you use the IWriter interface.

Now the cool thing about interfaces is you can write all your writing code, without knowing what is your writing target beforehand, and then can when the user decides (at runtime) weather he wants to write to the console or the printer, you just define the object as a console/printer writer and you don't need to change anything in your writing code, because they both use the same front end (interface).