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To illustrate the process of defining a .NET assembly at runtime, let s walk through the process of creating a single-file dynamic assembly named MyAssembly.dll. Within this module is a class named HelloWorld. The HelloWorld class supports a default constructor and a custom constructor that is used to assign the value of a private member variable (theMessage) of type string. In addition, HelloWorld supports a public instance method named SayHello(), which prints a greeting to the standard I/O stream, and another instance method named GetMsg(), which returns the internal private string. In effect, you are going to programmatically generate the following class type: // This class will be created at runtime // using System.Reflection.Emit. public class HelloWorld { private string theMessage; HelloWorld() {} HelloWorld(string s) {theMessage = s;} public string GetMsg() {return theMessage;} public void SayHello() { System.Console.WriteLine("Hello from the HelloWorld class!"); } } Assume you have created a new Visual Studio 2010 Console Application project workspace named DynamicAsmBuilder and import the System.Reflection, System.Reflection.Emit, and -System.Threading namespaces. Define a static method named CreateMyAsm(). This single method is in charge of the following: Defining the characteristics of the dynamic assembly (name, version, etc.) Implementing the HelloClass type Saving the in-memory assembly to a physical file

The {users}.uid this vote is from, unless the voter was anonymous The IP address this vote is from, unless the voter was logged in The timestamp of the vote creation

Also note that the CreateMyAsm() method takes as a single parameter a System.AppDomain type, which will be used to obtain access to the AssemblyBuilder type associated with the current application domain (see 17 for a discussion of .NET application domains). Here is the complete code, with analysis to follow: // The caller sends in an AppDomain type. public static void CreateMyAsm(AppDomain curAppDomain) { // Establish general assembly characteristics. AssemblyName assemblyName = new AssemblyName(); assemblyName.Name = "MyAssembly"; assemblyName.Version = new Version("1.0.0.0"); // Create new assembly within the current AppDomain. AssemblyBuilder assembly = curAppDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save); // Given that we are building a single-file // assembly, the name of the module is the same as the assembly. ModuleBuilder module = assembly.DefineDynamicModule("MyAssembly", "MyAssembly.dll"); // Define a public class named "HelloWorld". TypeBuilder helloWorldClass = module.DefineType("MyAssembly.HelloWorld", TypeAttributes.Public); // Define a private String member variable named "theMessage". FieldBuilder msgField = helloWorldClass.DefineField("theMessage", Type.GetType("System.String"), FieldAttributes.Private); // Create the custom ctor. Type[] constructorArgs = new Type[1]; constructorArgs[0] = typeof(string); ConstructorBuilder constructor = helloWorldClass.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, constructorArgs); ILGenerator constructorIL = constructor.GetILGenerator(); constructorIL.Emit(OpCodes.Ldarg_0); Type objectClass = typeof(object); ConstructorInfo superConstructor = objectClass.GetConstructor(new Type[0]); constructorIL.Emit(OpCodes.Call, superConstructor); constructorIL.Emit(OpCodes.Ldarg_0); constructorIL.Emit(OpCodes.Ldarg_1); constructorIL.Emit(OpCodes.Stfld, msgField); constructorIL.Emit(OpCodes.Ret); // Create the default ctor. helloWorldClass.DefineDefaultConstructor(MethodAttributes.Public);

// Now create the GetMsg() method. MethodBuilder getMsgMethod = helloWorldClass.DefineMethod("GetMsg", MethodAttributes.Public, typeof(string), null); ILGenerator methodIL = getMsgMethod.GetILGenerator(); methodIL.Emit(OpCodes.Ldarg_0); methodIL.Emit(OpCodes.Ldfld, msgField); methodIL.Emit(OpCodes.Ret); // Create the SayHello method. MethodBuilder sayHiMethod = helloWorldClass.DefineMethod("SayHello", MethodAttributes.Public, null, null); methodIL = sayHiMethod.GetILGenerator(); methodIL.EmitWriteLine("Hello from the HelloWorld class!"); methodIL.Emit(OpCodes.Ret); // "Bake" the class HelloWorld. // (Baking is the formal term for emitting the type) helloWorldClass.CreateType(); // (Optionally) save the assembly to file. assembly.Save("MyAssembly.dll"); }

Table A-72. profile_field (profile module)

The method body begins by establishing the minimal set of characteristics about your assembly, using the AssemblyName and Version types (defined in the System.Reflection namespace). Next, you obtain an AssemblyBuilder type via the instance-level AppDomain.DefineDynamicAssembly() method (recall the caller will pass in an AppDomain reference into the CreateMyAsm() method): // Establish general assembly characteristics // and gain access to the AssemblyBuilder type. public static void CreateMyAsm(AppDomain curAppDomain) { AssemblyName assemblyName = new AssemblyName(); assemblyName.Name = "MyAssembly"; assemblyName.Version = new Version("1.0.0.0"); // Create new assembly within the current AppDomain. AssemblyBuilder assembly = curAppDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save); ... } As you can see, when calling AppDomain.DefineDynamicAssembly(), you must specify the access mode of the assembly you wish to define, which can be any of the values shown in Table 17-10.

Represents that a dynamic assembly that can only be reflected over Represents that a dynamic assembly can be executed in memory but not saved to disk Represents that a dynamic assembly can be executed in memory and saved to disk Represents that a dynamic assembly can be saved to disk but not executed in memory

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