Delegated instance: Use a delegate to perform multiplication and division Calculation

Post a delegate class first

1 Class Processdelegate
2 {
3 Public   Delegate   Double Processdele ( Double Param1, Double Param2 );
4 Public   Static   Double Multiply ( Double Param1, Double Param2)
5 {
6 Return Param1 * Param2;
7 }
8 Public   Static   Double Divide ( Double Param1, Double Param2)
9 {
10 Return Param1 / Param2;
11 }
12 }

Then the design of the Form class

1 Namespace Delegate display multiplication and division
2 {
3 Public   Partial   Class Form1: Form
4 {
5 Public Form1 ()
6 {
7 Initializecomponent ();
8 }
9
10 Private Processdelegate. processdele process;
11
12 Private   Void Button#click ( Object Sender, eventargs E)
13 {
14 /* Processdele process; */
15
16 Double P1 = Convert. todouble (textbox1.text );
17 Double P2 = Convert. todouble (textbox2.text );
18
19 Double R =   0 ;
20
21 R = Process (P1, P2 );
22
23 Label1.text = Convert. tostring (R );
24 }
25
26 Private   Void Radiobutton2_checkedchanged ( Object Sender, eventargs E)
27 {
28 Process =   Null ;
29 Process =   New Processdelegate. processdele (processdelegate. Divide );
30 }
31
32 Private   Void Radiobutton1_checkedchanged ( Object Sender, eventargs E)
33 {
34 Process =   Null ;
35 Process =   New Processdelegate. processdele (processdelegate. Multiply );
36 }
37
38 Private   Void Form1_load ( Object Sender, eventargs E)
39 {
40 Process =   New Processdelegate. processdele (processdelegate. Multiply );
41 }
42 }
43 }