Silverlight and server-side Communication

To communicate with the server, we first use wcf to create a page for wcf.
Add a Simple summation method:
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Runtime. Serialization;
Using System. ServiceModel;
Using System. Text;
Namespace SLDome. Web
{
// Note: You can use the "RENAME" command on the "refactoring" menu to change the Interface Name "ISLS" in the Code and configuration file at the same time ".
[ServiceContract]
Public interface ISLS
{
[OperationContract]
Int Add (int number1, int number2 );
}
}
 
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Then we can implement this interface:

Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Runtime. Serialization;
Using System. ServiceModel;
Using System. Text;
Namespace SLDome. Web
{
// Note: You can use the "RENAME" command on the "refactoring" menu to change the class name "SLS" in the code, svc, and configuration file at the same time ".
// Note: To start the WCF test client to test the service, select SLS. svc or SLS. svc. cs in Solution Explorer and start debugging.
Public class SLS: ISLS
{
Public int Add (int number1, int number2)
{
Return number1 + number2;
}
}
}
 
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Now let's set the foreground page:

<UserControl x: Class = "SLDome. MainPage"
Xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
Xmlns: x = "http://schemas.microsoft.com/winfx/2006/xaml"
Xmlns: d = "http://schemas.microsoft.com/expression/blend/2008"
Xmlns: mc = "http://schemas.openxmlformats.org/markup-compatibility/2006"
Mc: Ignorable = "d"
D: DesignHeight = "300" d: DesignWidth = "400">
<Grid x: Name = "LayoutRoot" Background = "White">
<TextBox HorizontalAlignment = "Left" Height = "23" Margin = "118,58, 120 "TextWrapping =" Wrap "Name =" txtName "verticalignment =" Top "Width =" "/>
<TextBox HorizontalAlignment = "Left" Height = "23" Margin = "118,113, 120 "TextWrapping =" Wrap "Name =" txtPwd "verticalignment =" Top "Width =" "/>
& Lt; Button Content = "WCF" Name = "btnWcf" HorizontalAlignment = "Left" Margin = "46,216, 0, 0 "VerticalAlignment =" Top "Width =" 75 "Click =" btnWcf_Click "/>
<Button Content = "General handler" Name = "btnHandler" HorizontalAlignment = "Left" Margin = "211,216, 110 "VerticalAlignment =" Top "Width =" "Click =" btnHandler_Click "/>
</Grid>
</UserControl>
 
In this way, our wcf is ready. below is the code of our general processing program:
Create a page for the general processing program to process user login:
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Web;
Namespace SLDome. Web
{
/// <Summary>
/// LoginHandler Summary
/// </Summary>
Public class LoginHandler: IHttpHandler
{
Public void ProcessRequest (HttpContext context)
{
Context. Response. ContentType = "text/plain ";
String name = context. Request ["txtName"]. ToString ();
String password = context. Request ["txtPwd"]. ToString ();
If (name = "admin ")
{
If (password = "admin123 ")
{
Context. Response. Write ("Login successful! ");
}
Else
{
Context. Response. Write ("Incorrect password! ");
}
}
Else
{
Context. Response. Write ("the user name does not exist! ");
}
}
Public bool IsReusable
{
Get
{
Return false;
}
}
}
}
 
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Then we will handle this general handler:
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Net;
Using System. Windows;
Using System. Windows. Controls;
Using System. Windows. Documents;
Using System. Windows. Input;
Using System. Windows. Media;
Using System. Windows. Media. Animation;
Using System. Windows. Shapes;
Namespace SLDome
{
Public partial class MainPage: UserControl
{
Public MainPage ()
{
InitializeComponent ();
}
Private void btnWcf_Click (object sender, RoutedEventArgs e)
{
ServiceReference1.SLSClient SC = new ServiceReference1.SLSClient ();
SC. AddAsync (10, 20 );
SC. AddCompleted + = SC _AddCompleted;
}
Void SC _AddCompleted (object sender, ServiceReference1.AddCompletedEventArgs e)
{
MessageBox. Show (e. Result. ToString ());
}
Private void btnHandler_Click (object sender, RoutedEventArgs e)
{
String name = txtName. Text. Trim ();
String password = txtPwd. Text. Trim ();
WebClient wc = new WebClient ();
Wc. DownloadStringAsync (new Uri ("http: // localhost: 7090/LoginHandler. ashx? TxtName = "+ name +" & txtPwd = "+ password, UriKind. RelativeOrAbsolute ));
Wc. DownloadStringCompleted + = wc_DownloadStringCompleted;

}

Void wc_DownloadStringCompleted (object sender, DownloadStringCompletedEventArgs e)
{
MessageBox. Show (e. Result );
}
}
}