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the filename of the assembly when calling the AssemblyBuilder.DefineDynamicModule method:
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' VB Dim modBldr As ModuleBuilder = assemBldr.DefineDynamicModule("MainMod", _ "MyTempAssembly.dll") // C# ModuleBuilder modBldr = assemBldr.DefineDynamicModule("MainMod",
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"MyTempAssembly.dll");
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If you want a single file assembly and are serializing the assembly to disk, the filename specified here should be the same as the one you use in the Save method that will be shown later in the lesson. With the ModuleBuilder in hand, you can now create a dynamic type.
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Defining a Type
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Creating a dynamic type starts with calling the ModuleBuilder s DefineType method. This method takes a type name and TypeAttributes enumeration value. The TypeAttributes specifies options for the type. In this case, use it to specify that the type will be publicly available and that it is a class (instead of being a struct, interface, and so on):
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' VB Dim typeBldr As TypeBuilder = modBldr.DefineType("MyNewType", _ TypeAttributes.Public Or TypeAttributes.Class) // C# TypeBuilder typeBldr = modBldr.DefineType("MyNewType", TypeAttributes.Public | TypeAttributes.Class);
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You can also specify the base class and interfaces that it supports by using overrides of the DefineType method, which takes a third parameter as the base class and a fourth parameter that contains an array of types that define the interfaces implemented on the type:
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' VB Dim typeBldr2 As TypeBuilder = modBldr.DefineType("MyNewType", _ (TypeAttributes.Public Or TypeAttributes.Class), _ GetType(Hashtable), _ New Type() {GetType(IDisposable)}) // C# TypeBuilder typeBldr2 = modBldr.DefineType("MyNewType", TypeAttributes.Public | TypeAttributes.Class, typeof(Hashtable), new Type[] { typeof(IDisposable) });
Creating Members
The TypeBuilder class that the DefineType method returns is central to creating dynamic code. The TypeBuilder allows you to define any elements of the type. Table 14-12 shows the various methods of the TypeBuilder that help you define the members of a type.
Lesson 5: Creating Code at Runtime
Table 14-12 TypeBuilder Definition Methods
Name DefineConstructor DefineDefaultConstructor DefineEvent DefineField DefineGenericParameters DefineMethod DefineMethodOverride DefineNestedType DefinePInvokeMethod DefineProperty
Description Used to define constructors Used to define a parameterless constructor Used to define events Used to define fields Used to define generic parameters for generic types Used to define methods Used to define overloads for methods Used to define new types that are nested in another type Used to define calls to external code using the PInvoke functionality Used to define properties
The first thing you need to do on a new type is create a constructor. In this case, you want a default (or parameterless constructor), so you use the DefineDefaultConstructor method, like so:
' VB Dim ctorBldr As ConstructorBuilder = typeBldr.DefineDefaultConstructor(MethodAttributes.Public) // C# ConstructorBuilder ctorBldr = typeBldr.DefineDefaultConstructor(MethodAttributes.Public);
The DefineDefaultConstructor method takes a MethodAttributes enumeration value that dictates the type of constructor. In this case, you are marking your default constructor as publicly available. The real magic happens here when you can actually write your own code. You can now take your constructor and create an ILGenerator object. The ILGenerator class is used to generate local variables and IL code. For example, your constructor is going to do nothing but return, so you can write the code like so:
' VB Dim codeGen As ILGenerator = ctorBldr.GetILGenerator() codeGen.Emit(OpCodes.Ret)
14
Reflection
// C# ILGenerator codeGen = ctorBldr.GetILGenerator(); codeGen.Emit(OpCodes.Ret);
The ILGenerator.Emit call inserts a new line of IL code into the constructor (or any method) that the ILGenerator was created from. The OpCodes class exposes each of the different IL OpCodes as a separate static member. The OpCodes.Ret specifies the IL code for return.
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Microsoft Intermediate Language
Before you can really define code inside constructors or methods, you need to understand how IL works. Because this is an advanced topic that is not covered in the exam, it is not covered in this book. Microsoft s implementation of IL is called MSIL. Please see MSDN Online for more information on MSIL (http://msdn2.microsoft.com/en-US/library/8ffc3x75(VS.80).aspx).
Creating a constructor is only the beginning of what you can do. You can also create other members of the type. Next let s create a method. Specifying a method requires you to decide on both a return type and the parameter types. The following code provides an example:
' VB Dim methBldr As MethodBuilder = typeBldr.DefineMethod("Add", _ MethodAttributes.Public, _ Nothing, _ New Type() {GetType(System.String)}) // C# MethodBuilder methBldr = typeBldr.DefineMethod("Add", MethodAttributes.Public, null, new Type[] { typeof(string) });
Again, like the other methods, this definition method has its own attributes enumeration to define the method. The third and fourth parameters of the DefineMethod method are the return and parameter types. You can define a static method (or a shared one in Visual Basic) by simply adding MethodAttributes.Static to the attributes, like so:
' VB Dim methBldr As MethodBuilder = typeBldr.DefineMethod("Add", _ MethodAttributes.Public Or MethodAttributes.Static, _ Nothing, _ New Type() {GetType(System.String)}) // C# MethodBuilder methBldr = typeBldr.DefineMethod("Add",
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