C # Delegate Learning

.. > Preface

　　Inability to spit groove today's weather, especially cold, drink a cup of tea to continue to write something!

Commissioned

A delegate is a reference type, similar to a pointer type in C, but this "pointer" must point to a function of some kind.

Objects are also reference types, note the difference between reference types and value types. For example: Write down the results of the following programs.

1 classA2     {3          Public intx;4     }5     class Program6     {7         Static voidMain (string[] args)8         {9A A =NewA ();Tena.x =5; OneA B =A; Ab.x =6; -Console.WriteLine (a.x);//6 -Console.WriteLine (b.x);//6 theA C =NewA (); -c =A; -c.x =7; -Console.WriteLine (a.x);//7 +Console.WriteLine (c.x);//7 - Console.read (); +         } A}

Defines the delegate with the keyword delegate, in the form:

Access modifier delegate return value type method name (formal parameter list);

For example: publicdelegate int mydelegate (int x,int y);

Note the defined delegate is just a type that creates an instance of this type to complete the operation on the delegate. When you create an instance of a delegate, you must first define the function, or instantiate an object that encapsulates the method of the function or object into a variable of the newly created delegate type.

The operations of a delegate are:

　　　　=, the other function is encapsulated in the delegate.

+, add another function to the delegate

-, remove another function from the delegate

　　　　For example, the following programs:　

One:

1  　　　　    Public Delegate intMyDelegate (intXinty);2         Static intFintAintb)3{returnA +b;}4         Static intffintXinty)5{returnx > y?x:y;}6         Static voidMain (string[] args)7         {8MyDelegate a =Newmydelegate (f);9Console. WriteLine (A (3,5));//8TenMyDelegate B =Newmydelegate (FF); OneConsole.WriteLine (b (3,5));//5 AMyDelegate c=a+b;//swap A with B to see what the results are?  -Console. WriteLine (C (3,5));//5, here to add, C (3,5) is the return value of two methods, because the return value of the following method overrides the return value of the previous method, so only print out the return value of the following method, students do not confuse it here.  -c = c-b;//Change B to a to see what happens?  theConsole.WriteLine (C (3,5));//8 - Console.read (); -}

Two:

1  　　　　   Public Delegate voidMyDelegate (intXinty);2         Static voidFunintAintb)3{Console.WriteLine (A +b); }4         Static voidFUN1 (intXinty)5{Console.WriteLine (x > y?)x:y); }6         Static voidMain (string[] args)7         {8MyDelegate a =Newmydelegate (fun);9A3,5);//8TenMyDelegate B =Newmydelegate (FUN1); Oneb3,5);//5 AMyDelegate C = a + B;//swap A with B to see what the results are?  -C3,5);//8, 5, every method here has an output (see the method above??). ), so there are two results, uh.  -c = c-b;//Change B to a to see what happens?  theC3,5);//8 - Console.read (); -}

　　　　See here is not feel entrusted actually also not what, welcome everyone's opinion OH

　　

C # Delegate Learning