Static class

Davin Martyn

12y1.6kVisual Basic .NET

Hello Sir.....

What is static class and why are you make any class are static in c#?

4 Replies

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Abhishek Kumar12y ago
Hi,

what is static class:-
If a class is declared as static then the variables and methods should compulsorily be declared as static. A class can be declared static, indicating that it contains only static members. It is not possible to create instances of a static class using the new keyword. Static classes are loaded automatically by the .NET Framework common language runtime (CLR) when the program or namespace containing the class is loaded.

static class school
{
//All static member variables
   static int schoolID; //College Id will be same for all the students studying
   static string schoolName//Name will be same
   static string Address; //Address of the college will also same
    //Member functions
   public static int GetCollegeId()
   {
     schoolID; = 100;
     return (schoolID);
   }
}

features of static class
•They only contain static members.
•They cannot be instantiated.
•They are sealed.
•They cannot contain Instance Constructors or simply constructors as we know that they   are associated with objects and operates on data when an object is created
Why Static class
Utility classes with static methods mainly used as helper classes.
we can enforce coding standards and expectations with a minimum of effort.
By eliminating the constructor or the ability to create variables of a type, we introduce global variables and single-instance fields.
JobPencil12y ago
Try This Links Also

http://stackoverflow.com/questions/241339/when-to-use-static-classes-in-c-sharp

http://www.codeproject.com/Articles/11857/Introducing-C-static-classes

Thankyou
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Abhay Shanker12y ago
A static class is never instantiated. The static keyword on a class enforces that a type not be created with a constructor. In the static class, we access members directly on the type. This eliminates misuse of the class.
for more detail please check below urls

http://www.c-sharpcorner.com/uploadfile/hirendra_singh/static-classes-in-C-Sharp/

http://www.dotnetperls.com/static-class
Vulpes12y ago
A static class is a class which consists of nothing else but static members and which includes the 'static' modifier in the class declaration.

Static members for this purpose include constants and nested types.

A static class cannot have an instance constructor and so cannot be instantiated. However, they can contain a static constructor.

Static classes are implicitly sealed and so cannot be inherited from but they themselves inherit directly from System.Object.

Static classes are useful for gathering together a bunch of static members which have some relationship to one another. Examples in the .NET framework include System.Console and System.Math.

They can also be used as a repository for 'extension methods. For example : System.Linq.Enumerable or Queryable.

They are the closest thing which C# has to global functions and variables in some other languages. However, currently, the static member must always be qualified by the class name when called from outside its defining class though this is likely to change in the next version of C#.

For further details check this link:

http://msdn.microsoft.com/en-us/library/79b3xss3.aspx