C # Delegate Example

Two sub-Windows send messages to a main window

Main window:

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Windows.Forms;namespacewindowsformsapplication1{ Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); Form2 FM2=NewForm2 (); Fm2.msgsender= This. Receiver;//[3] Associating a delegate object with a methodfm2.            Show (); FORM3 FM3=NewForm3 (); Fm3.msgsender= This. Receiver;//[3] Associating a delegate object with a methodFM3.        Show (); }        //[2] completion of data transfer according to the delegate definition method         Public voidReceiver (stringinfo) {             This. Label2. Text =info; }       }        //[1] Declaration of delegation, general definition on the outside         Public Delegate voidShowinfo (stringparam);}

child window 1:

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Windows.Forms;namespacewindowsformsapplication1{ Public Partial classForm2:form { PublicForm2 () {InitializeComponent (); }        //To create a delegate object         PublicShowinfo Msgsender; //passing data through delegates        Private voidButton1_Click (Objectsender, EventArgs e) {Msgsender ( This. TextBox1.Text); }     }}

child window 2:

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Windows.Forms;namespacewindowsformsapplication1{ Public Partial classForm3:form { PublicForm3 () {InitializeComponent (); }        //create delegate object [from to main]         PublicShowinfo Msgsender; Private voidButton1_Click (Objectsender, EventArgs e) {Msgsender ( This. TextBox1.Text); }             }}

C # Delegate Example