c＃类作用域和对象创建

Question

cant quite understand how class work

 class Class1{
             private int a;
                 for(a=0;a<10;a++){}
// how can a be out of scope?


             }

and why i can do this

class Class1{
             private int a;
             void tera()
              {
               private string aiha="lk"; //commenting this out ,makes it work why??
               for(a=0;a<10;a++){}
               }
             }

1st part : can a class have only methods and fields? why?

2nd part: cant methods have declarations?

i know this might be a poor explanation but i cant wrap my head around .

Answer 1

For the first part, you haven't defined a method name so it wont work, you can't place the method's body inside a class without declaring a method.

class Class1{
      private int a = 0;
      void Example() {
         for(a=0;a<10;a++){}
       }

             }

Would work

For the second part, it wouldn't make sense as variable is only available inside the method's scope so its meaningless to give it a modifier.

You can read more about classes here but basically its a group of members and methods that are usually gonna be used every time you create an instance of that class.

Answer 2

1st.

(Classes are basic constructs of .NET Framework.)

Because it's object oriented it can only contain MEMBERS like methods, fields, constants, properties, and events as single units . (note: also members must be declared within a type).

2nd

In C# there are no global variables or methods as there are in some other languages.

and i think since c# considers a method as a single object you cannot try give different access to its variables, it will think you are trying to create another member for the class.