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5. In the Main method (Visual C#) or Sub Main (Visual Basic), type the following code. This code creates an instance of the remote Patient object.
'VB Dim newPatient As Patient = _
CType(Activator.GetObject(GetType(Patient), _
5
Creating a Remoting Client Application
"tcp://localhost:9000/Patient.rem"), Patient) //C# Patient newPatient =
(Patient)Activator.GetObject(typeof(Patient),
"tcp://localhost:9000/Patient.rem");
6. Below the code that creates an instance of the Patient object, type the following code or something similar to utilize and test the PersonalInformation method on the remote object:
'VB Console.WriteLine(newPatient.PersonalInformation())
Console.WriteLine(newPatient.History())
//C# Console.WriteLine(newPatient.PersonalInformation());
Console.WriteLine(newPatient.History());
7. On the Build menu, click Build LabConsumer to compile the project. After the project successfully builds, press Ctrl+F5 to start the program without debug ging. The console output should render something similar to this:
Patient ID: 001 :: John Doe :: 123 Main Street :: Someplace, AZ 85000 01/12/2001; Diagnosis: cold | Treatment: take 2 and call me in the morning. 03/04/2005; Diagnosis: broken toe | Treatment: nothing.
8. Close the console window for the LabConsumer project and the LabServer project.
Lesson Summary
Before methods can be called on a remote object, an instance of the remote object must be created. The .NET Framework provides the new (New) operator and the Activator.GetObject method to create an instance of a remote object. Activator.GetObject is passed the configuration information directly so it requires fewer lines of code to be written.
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 3, How to Access a Remote Method. The questions are also available on the companion CD if you prefer to review them in electronic form.
Lesson 3: How to Access a Remote Method
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. What approach to creating an instance of a remote object requires the fewest lines of code to be written (Select the best answer.) A. new operator in C# B. Activator.GetObject method C. New operator in Visual Basic D. Activator.Create method 2. What approach to creating an instance of a remote object requires programmatic configuration or configuration via a configuration file (Select all that apply.) A. new operator in C# B. Activator.GetObject method C. New operator in Visual Basic D. Activator.Create method
5 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involv ing the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
A server can host and expose the services of a remote object. Client applications of any type can consume the services exposed by remote objects. Creating a client application to consume a remote object can be fairly straight forward if all required information is known about the remote object. Information about the remote object that might be required includes the URL where the object is located, the communication channel being used by the remote object, and the method of activation implemented by the remote object. Remote objects can be marshaled to the client by value or reference. Remote objects can be activated on the server or the client. Remote objects that are acti vated on the server can be activated as Singleton objects or SingleCall objects. Client applications that consume remote objects can be configured and man aged programmatically or by using .NET Framework configuration files. The methods exposed by remote objects can be called by client applications either synchronously or asynchronously. There are two approaches for creating an instance of a remote object: using the new (New) operator or using the Activator.GetObject method.
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