28 June 2012

Class Vs Structure


In .NET are two categories of types: reference typesand value types.
- Struct is a value types and classe is a reference types.
- A class is a reference type and its object is created on the heap.
- A structure is a value type and its object is created on the stack.
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- A class variable can be assigned null, a struct variable cannot assign null.
- When passing a class to a method, it is passed by reference. When passing a struct to a method, it’s passed by value instead of as a reference.
- A class is defined by using the class keyword, a structure is defined by using the struct keyword.
For example, public class StudentReport{…}
For example, public struct StudentReport{…}
- We cannot have instance Field initializers in structs, but we can have instance Field initializers in classes.
Example:
class TestClass
{
int myNumber =25; // no error.
public void MyMethod( )
{
// code
}
}
struct MyStruct
{
int myVar = 15; // error.
public void MyMethod ( )
{
// code
}
}
- To instantiate classes we must use the new operator, in struct can not be.
For example, StudentReport StudRepo = new StudentReport(stud_enroll, stud_name, stud_report);
For example, StudentReport StudRepo;
- Classes support inheritance, for structs is no inheritance.
- A class can be inherited from a class or struct.
- A class is permitted to declare a destructor, a struct is not.
- We use classes for complex and large set of data, structs are simple to use.
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