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// Define a private String member variable named "theMessage". FieldBuilder msgField = helloWorldClass.DefineField("theMessage", typeof(string), FieldAttributes.Private); Notice how the TypeBuilder.DefineField() method provides access to a FieldBuilder type. The TypeBuilder class also defines other methods that provide access to other builder types. For example, DefineConstructor() returns a ConstructorBuilder, DefineProperty() returns a PropertyBuilder, and so forth.

fid int, uid int,

As mentioned earlier, the TypeBuilder.DefineConstructor() method can be used to define a -constructor for the current type. However, when it comes to implementing the constructor of -HelloClass, you need to inject raw CIL code into the constructor body, which is responsible for assigning the incoming parameter to the internal private string. To obtain an ILGenerator type, you call the GetILGenerator() method from the respective builder type you have reference to (in this case, the ConstructorBuilder type). The Emit() method of the ILGenerator class is the entity in charge of placing CIL into a member implementation. Emit() itself makes frequent use of the OpCodes class type, which exposes the opcode set of CIL using read-only fields. For example, OpCodes.Ret signals the return of a method call. OpCodes.Stfld makes an assignment to a member variable. OpCodes.Call is used to call a given method (in this case, the base class constructor). That said, ponder the following constructor logic: // Create the custom constructor taking // a single System.String argument. Type[] constructorArgs = new Type[1]; constructorArgs[0] = typeof(string); ConstructorBuilder constructor = helloWorldClass.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, constructorArgs); // Now emit the necessary CIL into the ctor. 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); // Call base class ctor. // Load the object's "this" pointer on the stack. constructorIL.Emit(OpCodes.Ldarg_0); // Load incoming argument on virtual stack and store in msgField. constructorIL.Emit(OpCodes.Ldarg_1); constructorIL.Emit(OpCodes.Stfld, msgField); // Assign msgField. constructorIL.Emit(OpCodes.Ret); // Return.

Now, as you are well aware, as soon as you define a custom constructor for a type, the default constructor is silently removed. To redefine the no-argument constructor, simply call the DefineDefaultConstructor() method of the TypeBuilder type as follows: // Reinsert the default ctor. helloWorldClass.DefineDefaultConstructor(MethodAttributes.Public); This single call emits the standard CIL code used to define a default constructor: .method public hidebysig specialname rtspecialname instance void .ctor() cil managed { .maxstack 1 ldarg.0 call instance void [mscorlib]System.Object::.ctor() ret }

The queue name The arbitrary data for the item Timestamp when the claim lease expires on the item Timestamp when the item was created

Last but not least, let s examine the process of emitting the SayHello() method. The first task is to obtain a MethodBuilder type from the helloWorldClass variable. Once you do this, you define the method and obtain the underlying ILGenerator to inject the CIL instructions: // Create the SayHello method. MethodBuilder sayHiMethod = helloWorldClass.DefineMethod("SayHello", MethodAttributes.Public, null, null); methodIL = sayHiMethod.GetILGenerator(); // Write a line to the Console. methodIL.EmitWriteLine("Hello there!"); methodIL.Emit(OpCodes.Ret); Here you have established a public method (MethodAttributes.Public) that takes no parameters and returns nothing (marked by the null entries contained in the DefineMethod() call). Also note the EmitWriteLine() call. This helper member of the ILGenerator class automatically writes a line to the standard output with minimal fuss and bother.

Now that you have the logic in place to create and save your assembly, all that s needed is a class to trigger the logic. To come full circle, assume your current project defines a second class named AsmReader. The logic in Main() obtains the current AppDomain via the Thread.GetDomain() method that will be used to host the assembly you will dynamically create. Once you have a reference, you are able to call the CreateMyAsm() method. To make things a bit more interesting, once the call to CreateMyAsm() returns, you will exercise some late binding (see 15) to load your newly created assembly into memory and interact with the members of the HelloWorld class. Update your Main() method as follows:

The rdf_mapping table stores custom RDF mappings for user-defined content types or overridden module-defined mappings. Table A-75. rdf_mapping