Initial knowledge of C # delegation and entrust chain

Delegates are a very important feature of C #. The code is as follows:

 classProgram { Public  Delegate voiddelegatetest (); Static voidMain (string[] args) {delegatetest dtstatic=NewDelegateTest (PROGRAM.METHOD1);//instantiation, static method, without newDelegateTest dtinstance =NewDelegateTest (NewProgram (). Method2);//instance method, need newDelegateTest Delegatechain =NULL;//A delegate chain that is defined as nullDelegatechain + = dtinstance;//add a delegate instance with "+"Delegatechain + = dtstatic;//Delegatechain ();       Console.read (); }        Private Static voidmethod1 () {Console.WriteLine ("static method Output"); }        Private voidMethod2 () {Console.WriteLine ("instance method Output"); }    }

The results of the operation are as follows:

From the results, we can see that the order of execution of the delegate chain is the order of the delegate instance;

Similarly, you can also use "-" to remove a delegate instance in a delegate chain:

  classProgram { Public  Delegate voiddelegatetest (); Static voidMain (string[] args) {delegatetest dtstatic=NewDelegateTest (PROGRAM.METHOD1);//instantiation, static method, without newDelegateTest dtinstance =NewDelegateTest (NewProgram (). Method2);//instance method, need newDelegateTest Delegatechain =NULL;//A delegate chain that is defined as nullDelegatechain + = dtinstance;//add a delegate instance with "+"Delegatechain + =dtstatic; Delegatechain-= dtstatic;//remove a delegate instance with "-"Delegatechain ();       Console.read (); }        Private Static voidmethod1 () {Console.WriteLine ("static method Output"); }        Private voidMethod2 () {Console.WriteLine ("instance method Output"); }

The results of the operation are as follows:

Initial knowledge of C # delegation and entrust chain