`class`关键字和用户定义的数据类型

Question

The title may be a bit weird. I don't know how to title this question in a better way.

Suddenly, I got extremely confused about data types. If a Class is a User-Defined data type, what does the keyword class do?

For example:

    internal class MyClass
    {
    }

    static class Main
    {

        static int Main(string[] args)
        {
            MyClass mc = new MyClass();
        }

     }

So here, is the user-defined data type MyClass? If so, what does the keyword class do?

I thought class was just a blueprint for your user-defined data type. I'm not so sure anymore.

If you don't understand the question, please comment so I can maybe try to make it more clear.

Answer 1

There are various categories of user-defined types - class is just one of them; see also:

• struct
• enum
• delegate
• interface

Here, class tells the compiler that you are defining a reference-type single-inheritance type.