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Reflection
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Console.Read() End Sub End Class // C# using System.Reflection; using System.Reflection.Emit; class Program { static void Main(string[] args) { // Create an Assembly Name AssemblyName theName = new AssemblyName(); theName.Name = "DemoAssembly"; theName.Version = new Version("1.0.0.0"); // Get the AppDomain to put our assembly in AppDomain domain = AppDomain.CurrentDomain; // Create the Assembly AssemblyBuilder assemBldr = domain.DefineDynamicAssembly(theName, AssemblyBuilderAccess.ReflectionOnly); // Define a module to hold our type ModuleBuilder modBldr = assemBldr.DefineDynamicModule("CodeModule", "DemoAssembly.dll"); // Create a new type TypeBuilder animalBldr = modBldr.DefineType("Animal", TypeAttributes.Public); // Display the new Type Type animal = animalBldr.CreateType(); Console.WriteLine(animal.FullName); foreach (MemberInfo m in animal.GetMembers()) { Console.WriteLine(" Member ({0}): {1}", m.MemberType, m.Name); } Console.Read(); } }
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9. Build the project, and resolve any errors. Verify that the console application successfully creates an assembly, module, and type and shows the members from the derived Object class.
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Lesson 5: Creating Code at Runtime
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To create an assembly dynamically at runtime, use the DefineDynamicAssembly method of the AppDomain class. To create a module within a dynamic assembly, call the DefineDynamicModule by using the AssemblyBuilder class. To build types at runtime, use the ModuleBuilder class s DefineType method. To create members of a type, use the TypeBuilder class s definition methods, such as DefineConstructor, DefineMethod, DefineProperty, and DefineField. To save a dynamic assembly to disk, call the AssemblyBuilder class s Save method.
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You can use the following questions to test your knowledge of the information in Lesson 5, Creating Code at Runtime. The questions are also available on the companion CD if you prefer to review them in electronic form.
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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 class allows the creation of a dynamic assembly (an instance of the AssemblyBuilder class) A. AssemblyBuilder (because it has a public constructor or static method) B. ModuleBuilder C. AppDomain D. Application 2. What values of the AssemblyBuilderAccess enumeration allow you to execute the assembly A. AssemblyBuilderAccess.Run B. AssemblyBuilderAccess.ReflectionOnly C. AssemblyBuilderAccess.RunAndSave D. AssemblyBuilderAccess.Save
14 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can perform 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 involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
The Reflection namespace includes classes for interrogating the metadata about assemblies, modules, and types in the CLR. A number of assembly-specific attributes can be used to specify information about an assembly, such as the copyright, the version, and trademark information. A number of classes that are used to hold metadata information derive from the MemberInfo class. These include Type, MethodInfo, and FieldInfo. The BindingFlags enumeration is used to define different options for finding and executing members of various types. The MemberInfo classes can be used to execute code at runtime, even if you do not have the project referenced during compilation. The builder classes can be used to build assemblies, modules, and types at runtime, and they can even allow you to persist new assemblies to disk.
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
module multifile assemblies satellite assemblies
14 Review
Case Scenario: Create a Plugin Architecture
In the following case scenario, you will apply what you ve learned about how to use application domains and services. You can find answers to the questions presented in this section in the Answers section at the end of this book. You work for a small ISV. Your main application allows customers to draw network diagrams. Your company is trying to get other companies to provide new functionality to your software that your customers can purchase. Your manager wants you to recommend how to allow this type of change to your application.
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