source code to generate barcode in vb.net 27: NET Remoting in Visual C#.NET

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27: NET Remoting
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PART V
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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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Configuring NET Remoting
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In this section, we will look at another method of hosting the remote component As we have mentioned, the remote component can be hosted by any type of application In our previous example, we created a server console class to host our component In this section, we will use IIS and take advantage of an HTTP channel for transmission In addition to exploring the technique for using a remote component in IIS, we will look at the configuration file that can be created to provide information to the runtime environment We will also create our application within Visual Studio NET in order to take advantage of some of the shortcuts available developers
Creating the Remote Object
Create the remote server object within Visual Studio NET by following these steps: 1 Start a new class library application in Visual Studio Name it HelloWorldIIS
2 Rename the Class1cs module to Hellocs, and adjust the code for the class definition and the constructor Be sure to make your new class inherit from SystemMarshalByRefObject:
public class Hello: SystemMarshalByRefObject { public Hello()
3 Add the HelloWorld() method to the class file:
public string HelloWorld() { return "Hello World!"; }
27: NET Remoting
4 Build the remote object by selecting Build | Build HelloWorldIIS from the menus
Creating the Remote Object Configuration File
In order to specify the necessary operating parameters to the runtime environment, you need to provide a configuration file for the remote object This configuration file is called webconfig, and it looks like this:
<configuration> <systemruntimeremoting> <application> <service> <Wellknown mode="SingleCall" type="HelloWorldIISHello, Hello" objectUri="Hellosoap" /> </service> </application> </systemruntimeremoting> </configuration>
Place the webconfig file in the same directory as the Hellodll file The configuration file has a section for configuring the remoting instructions Under the <service> tag, you can see the information pertaining to the server mode, SingleCall, as well as to the type and location (URI) of the remote object The type includes the fully qualified name of the remote object as its first parameter, and the executable filename as the second parameter EXAM TIP The webconfig file must be placed in the same directory as the component PART V
Choosing the Mode
At this point, it is probably a good idea to discuss the differences between SingleCall and Singleton mode Either of these modes can be used when the object is server activated (that is, when the server is responsible for instantiating the object) SingleCall mode objects are activated when the method call is received, and they live until the method is complete In other words, the object is only around as long as the method is alive As soon as the method is finished, the remote component is no longer available There is no state maintained between calls (there can t be the object is destroyed after the method call) Each client will receive a reference to its own server object for the life of the method This is a more scalable option, since any number of clients can be added and, as long as the hardware and memory requirements do not explode, the remoting environment will keep on making server objects for each client call On the downside, there is no state maintained between method calls, so that data that is created or received during the method is destroyed when the method is finished Singleton mode objects are created after the first remote method call, and they stick around for the duration of the hosting application In other words, every client will receive a reference to the same object as every other client receives There is only ever a
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
single instance of any particular remote component alive This is an excellent solution for sharing data between clients One client can make a change that another client will see, since they are looking at the same object This is not a very scalable approach, but it is good to use if you want to share objects between clients EXAM TIP You cannot mix modes for a single class A class can only have one mode either SingleCall or Singleton
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