Understanding of interfaces in C #

. All are "virtual" and cannot be instantiated. This is why the interface cannot contain fields-member variables.
2. because the interface is virtual, the indexes, attributes, and time in the interface can only be declared, but cannot be implemented in the interface. How to implement it is a derivative interface or a derived class.
3. All have the nature of the template. If an interface or class inherits from an interface, it automatically has the features of the Consortium (including indexes, attributes, functions, and practices ).
4. interfaces support multi-inheritance. in C #, classes support single inheritance, which actually represents a type of bearer capability.
The following is a simple definition of the interface: CopyCode The Code is as follows: Interface
Sampinterface1
{
String
This [int Index]
{
Get;
Set
}

Event eventhandler event;
Void find (INT value );
// Note that no
{
}
String Po
Int
{
Get;
Set
}

}

The above interface defines an index this, a practice event, a method find and an attribute point.Copy codeThe Code is as follows: public interface sampineterface: sampineterface1 {
Pravite int A = 1;
Void find (INT value)
{
A + = value;
}
Event eventhandler event;
Protected void onevent ()
{
If (event = NULL)
{Return event (this. system. eventagrs. Empty ;)}
}
}