Sample code sharing for generic delegates in C #

This article mainly describes generic delegates in C #. Have a good reference value, follow the small series together to see it

Learn about generic delegates in C # today.

1. General delegate, delegate, can also pass in parameters (<=32), declared method is public delegate void Somethingdelegate (int a);

using system;using system.collections.generic;using system.linq;using System.Text;using System.threading.tasks;namespace delegatesummary {public delegate void getintdelegate (int a);//Declare a delegate public class Geti Ntclass {public static void setdelegatestring (int a,getintdelegate getintdelegate) {//Use delegate getintdelegate (a);} public void GetInt1 (int a) {//Method 1 Console.WriteLine ("GetInt1 method invocation, Parameter:" + a), "public void GetInt2 (int a) {//Method 2 Console.writ Eline ("GetInt2 method invocation, Parameter:" + a);  }} class Program {static void Main (string[] args) {getintclass gc=new getintclass (); 　Getintclass.setdelegatestring (5, gc.getint1);   Method Getintclass.setdelegatestring (Gc.getint2) as the parameter of the delegate;  Console.WriteLine ("=====================");  Getintdelegate getintdelegate;   　　Getintdelegate = Gc.getint1;  Bind the method to the delegate getintdelegate + = Gc.getint2;   Getintclass.setdelegatestring (getintdelegate); Console.read (); }  }}

Output results, note the difference between the two methods, the first method as a delegate parameter, the second is to bind the method to the delegate.

2. Generic delegate action, up to 16 parameters, no return value.

using system;using system.collections.generic;using system.linq;using System.Text;using System.threading.tasks;namespace Delegatesummary {class Program {static void Main (string[] args) {testaction<string > (getString, "Whitetaken");  Incoming method Testaction<int> (GETINT, 666);  Testaction<int, String> (Getstringandint, 666, "Whitetaken");   Console.read (); } public static void Testaction<t> (Action<t> action,t p1) {//action passed in a parameter test Action (p1);} public stat IC void Testaction<t, p> (action<t, p> action, T p1, P p2) {//action incoming two parameters test Action (P1,P2);} public static V OID getString (String a) {//implement int type print Console.WriteLine ("Test action, pass in string, and pass in Parameter:" +a);} public static void GetInt (int a) {//Implement string type Print Console.WriteLine ("Test action, pass in int, and pass in Parameters:" + a);} public static void Getstringandint (int A, string name) {//Implements Int+string type Print Console.WriteLine ("Tests the action, passes in two arguments, and the passed in parameter is : "+ A +": "+name);}}} 

Test results:

3. Generic delegate func, up to 16 parameters, with a return value. (similar to action, just a return value)

4. Generic delegate predicate (not very common), the return value is bool, used to search for elements in array and list. (not used, wait for the update)