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How to Unload an Application Domain
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One of the advantages of loading assemblies in new application domains is that you can unload the application domain at any time, freeing up resources. To unload a domain and any assemblies within the domain, call the static AppDomain.Unload method:
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' VB Dim d As AppDomain = AppDomain.CreateDomain("NewDomain") AppDomain.Unload(d) // C# AppDomain d = AppDomain.CreateDomain("NewDomain"); AppDomain.Unload(d);
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Individual assemblies or types cannot be unloaded.
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Lab: Creating Domains and Loading Assemblies
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In this lab, you create an application domain and then load an assembly using two different techniques: by filename and by reference. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
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Exercise 1: Load an Assembly by Filename
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In this exercise, you create an application domain and use it to run an assembly that displays your Boot.ini file. 1. Copy the 08\Lesson1-ShowBootIni folder from the companion CD to your hard disk, and open either the C# version or the Visual Basic version of the project. 2. Build and run the ShowBootIni console application to verify it works properly. If it does properly display your Boot.ini file, modify the application to display any text file. 3. Create a new console application named AppDomainDemo.
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Lesson 1: Creating Application Domains
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4. In your new console application, write code to create an AppDomain object. For example, the following code would work:
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' VB Dim d As AppDomain = AppDomain.CreateDomain("NewDomain") // C# AppDomain d = AppDomain.CreateDomain("New Domain");
5. Next, write code to run the ShowBootIni assembly within the newly created AppDomain by explicitly providing the full path to the file. For example, the following code would work, but it will need to be adjusted to reflect where you saved the executable file:
' VB d.ExecuteAssembly("ShowBootIni.exe") // C# d.ExecuteAssembly("ShowBootIni.exe");
6. Build the project, and resolve any errors. Verify that the console application successfully calls the ShowBootIni.exe assembly and that it displays the text file successfully.
Exercise 2: Load an Assembly by Assembly Name
In this exercise, you modify the console application you created in Exercise 1 to run an assembly based on the assembly name rather than the file name. 1. Open the AppDomainDemo project you created in Exercise 1. 2. Add a reference to the ShowBootIni assembly. 3. Modify the call to the AppDomain.ExecuteAssembly method to call AppDomain .ExecuteAssemblyByName instead. For example, you might use the following code:
' VB Dim d As AppDomain = AppDomain.CreateDomain("NewDomain") d.ExecuteAssemblyByName("ShowBootIni") // C# AppDomain d = AppDomain.CreateDomain("New Domain"); d.ExecuteAssemblyByName("ShowBootIni");
4. Build the project, and resolve any errors. Verify that the console application successfully calls the ShowBootIni.exe assembly and that it displays the text file successfully.
8
Application Domains and Services
Lesson Summary
An application domain is a logical container that allows multiple assemblies to run within a single process but prevents them from directly accessing other assemblies memories. Create an application domain any time you want to launch an assembly. The AppDomain class contains methods for defining privileges, folders, and other properties for a new application domain; launching an assembly; and unloading an application domain. To create an AppDomain class, call the static AppDomain.CreateDomain method. AppDomain does not have any traditional constructors. To load an assembly in an application domain, create an instance of the AppDomain class, and then call the AppDomain.ExecuteAssembly method. To unload an application domain, call the AppDomain.Unload static method.
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 1, Creating Application Domains. The questions are also available on the companion CD if you prefer to review them in electronic form.
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. Which of the following are valid reasons to create an application domain (Choose all that apply.) A. It is the only way to launch a separate process. B. You can remove the application domain to free up resources. C. Application domains improve performance. D. Application domains provide a layer of separation and security. 2. Which of the following are valid ways to run an assembly within an application domain (Choose all that apply.) A. AppDomain.CreateDomain B. AppDomain.ExecuteAssembly
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