C# grammar[0]

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namespace sa
{
    public class Text
        {
            public class B
            {
            }
            public delegate void f(int a,int b);
            public void t(int x, int y)
            {
                Console.WriteLine((x+y));
            }
            public static void Main()
            { 
                B b=new B();
                Text text=new Text();
                text.t(2,3);
            }
        }
}

t() should be used by the text object.
Why can the nested class B be used directly?
Is class B considered static by the compiler?

Posted 25-May-10 22:32pm

shilf

Updated 26-May-10 5:43am

Deeksha Shenoy

v6

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Johnny J. 26-May-10 4:44am

Added PRE tags to make your code more readable...

2 solutions

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voloda2 · Accepted Answer · 2010-05-25T22:34:00

Solution 1

Your main method is defined inside the class Text. So the B class is directly visible to it.

Try to move Main() into another class and it will be no more visible to it directly.

Posted 25-May-10 22:34pm

voloda2

Comments

shilf 26-May-10 4:43am

I know Answer 1 is right. In main() I also write: Text.B b=new Text.B(); it is also right ;these two method is both right! why we can write: B b=new B();

shilf 26-May-10 4:48am

is the nested class static by compiler?

who can tell me the internal organization?

voloda2 26-May-10 4:58am

Not sure if I understand what are you asking about.

The nested class V is a standard class, which can be instantiated based on its vibility modifiers.
It has only one speciality - if you have an instance of the top class A, you can access its private members from the V's code.

class A
{
private int i;
public A()
{

}
public class V
{
int ii;

public V()
{
A a = new A();
a.i = 10;
}
}
}

It's more like an additional namespace.

shilf 26-May-10 5:07am

Voloda2: i is private in Class A; i can not be used out of class A ;I think in Class V {a.i is wrong}

voloda2 26-May-10 5:13am

That's exactly what am I writting about - it's a speciality of class V - it can access private members of the top class A.

shilf 26-May-10 5:15am

We know, Text.B b=new Text.B();the sentence is right;only static can be used by Text diretly(Text.B).so is Class B static Class ?

voloda2 26-May-10 5:20am

B is not static class, you are using an instance of it - think it's as a namespace. It's same as sa.Text text = new sa.Text() or sa.Text.B b = new sa.Text.B()

shilf 26-May-10 5:25am

Voloda2:sorry ,your code is exact;

shilf 26-May-10 5:29am

voloda2:thanks a lot

Abhinav S · Accepted Answer · 2010-05-25T23:35:00

Solution 2

shilf wrote:
is class B static by compiler?

Class B is not static. You would not be able to do
B b=new B(); if this was the case.

For different samples on nested classes, have a look here.

Posted 25-May-10 23:35pm

Abhinav S

Updated 26-May-10 3:01am

v3

Comments

shilf 26-May-10 8:17am

A Tutorial on Nested Classes in C#
:http://www.codeproject.com/KB/cs/nested_csclasses.aspx#_comments
it is perfect
thank you,Answer 2
thanks for all helper

shilf 26-May-10 9:07am

is Class like Namespace?but its' scope is smaller than Namespace

shilf 26-May-10 20:33pm

I am a student in china,the book and website about computer programming are very little and poor.who can introduce me some website about computer in english