Category: .NET

15 Mar 2017 14:50

Joined:	01/02/2012
Level:	Silver
Points:	101

Points:	3

What are the access specifier can be used in class

Hai All,

May i know what are the access specifier can be used to create a class

Default access specifier of class is internal

we can change as public, but my doubt is ... when i change class access specifier to protected,private,protected internal it gives error

Thanks and Regards,
A.L.Chellappan

#769045

15 Mar 2017 15:10

Joined:	18/12/2008
Level:	Gold
Points:	2921

Points:	4

Hi,

Changing the access modifier of a method in a derived type is pointless that's why it's not allowing to do so.


class Base
{
    public virtual void A() {}
}

class Derived: Base
{
    protected override void A() {}
}

Now here if you use protected,


   public class A
   {
      protected int x;

      public class B
      {
          public static A CreateClassA()
          {
              A x = new A();
              x.x = 5;   // ERROR : No privilege
              return x;
          }
      }
   }

Thanks,
Mani

#769048

16 Mar 2017 07:45

Joined:	28/04/2006
Level:	Gold
Points:	29773

Points:	4

Hai Chellappan,
The default access specifier for the class is internal and we can make it public also. Only these two access specifiers will work for the main class. You can't make the main class or the outer class as private, protected or protected-internal etc.
But you can use other access specifiers with the internal or nested classes. Like below:


internal class A
{
  protected class B
  {
     // some code
  }
}

Again another point is that if the outer class scope is internal(means it can be access in the same assembly/project), the inner class cant be the public(bigger scope than outer class). So if the outer class is public, you can use any access specifier for the internal class(i.e. public, internal, protected etc).
Hope it will be helpful to you.

Regards,
Pawan Awasthi(DNS MVM)
+91 8123489140 (whatsApp), +60 14365 1476(Malaysia)
pawansoftit@gmail.com

#769049

16 Mar 2017 12:28

Joined:	13/06/2007
Level:	Gold
Points:	21327

Points:	4

Following access modifiers can be used in class
public
The type or member can be accessed by any other code in the same assembly or another assembly that references it.

private
The type or member can be accessed only by code in the same class or struct.

protected
The type or member can be accessed only by code in the same class or struct, or in a class that is derived from that class.

internal
The type or member can be accessed by any code in the same assembly, but not from another assembly.

protected internal
The type or member can be accessed by any code in the assembly in which it is declared, or from within a derived class in another assembly. Access from another assembly must take place within a class declaration that derives from the class in which the protected internal element is declared, and it must take place through an instance of the derived class type.

Thanks
Koolprasd2003
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]

#769080

22 Mar 2017 20:38

Joined:	30/04/2012
Level:	Gold
Points:	7233

Points:	3

Access specifiers are keywords in object-oriented languages that set the accessibility of classes, methods, and other members. Example of Access specifiers is given in this code snippet

 sing namespace std;
 
class Line {
   public:
      double length;
      void setLength( double len );
      double getLength( void );
};
 double Line::getLength(void) {
   return length ;
}
 
void Line::setLength( double len ) {
   length = len;
}

What are the access specifier can be used in class

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