Remoting over the Web in VB.NET

In this article I will explain you about Remoting over the Web in VB.NET.
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It is also possible for Internet Information Server (IIS) to host remote objects.The console client project is named WebClientExe.

To use IIS as a server, you must take a number of steps:

  • The remote object must be server activated.

  • Map a virtual directory, on the Web server, to the SimpleObjectLib folder.

  • The remote object can't be programmatically configured. It must use a web.config file in the virtual directory's root, see Listing 25.26.

Listing 25.26: Web.config

<?
xml version="1.0" ?>
<
configuration>
      <
system.runtime.remoting>
            <
application>
                  <
service>
                        <
wellknown
                       
mode="SingleCall"
                       
type="SimpleObjectLib.SimpleObject, SimpleObjectLib"
                       
objectUri="Simple.rem">
                        </
wellknown>
                  </
service>
                  <
channels>
                        <
channel
                       
name="Server-Activated Web Client"
                       
type="System.Runtime.Remoting.Channels.Http.HttpChannel, System.Runtime.Remoting"/>
                  </
channels>
            </
application>
      </
system.runtime.remoting>
</
configuration>

You should be aware of a number of items in the configuration file:

  • No port number need be specified, as IIS has already been configured to listen on a port, normally port 80.

  • The objectUri attribute in the wellknown element must use the extension .rem or .soap.

    The client code remains the same as previous server-activated examples (see Listing 25.27). The client output is shown in Figure 25.16.

Listing 25.27: WebClient.vb

      Protected
Sub Calendar_Selection(ByVal sender As [Object], ByVal e As EventArgs)
        ChannelServices.RegisterChannel(New HttpChannel())
        Dim simple As SimpleObject = Nothing
        simple = DirectCast(Activator.GetObject(GetType(SimpleObject),
        "http://localhost/WebRemoting/Simple.rem"), SimpleObject)
        Dim ret As String = Nothing
        ret = simple.ConCatString("using the", "Web for remoting.")
    End Sub


Figure 25.16: WebClientExe Output

Figure-25.16.gif

Conclusion

Hope this article would have helped you in understanding Remoting over the Web in VB.NET.

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