Reflection can be used to create code at runtime. It includes namespace called System.Reflection.Emit that houses set of builder classes that take care of creating code. The process is just like normal process. We create an assembly following by a module within the assembly, and finally types within the module.

Builder Classes

 

Name	Description for Used to Buid
AssemblyBuilder	Assemblies at runtime
ConstructorBuilder	Constructors at runtime
EnumBuilder	Enumerations at runtime
EventBulder	EventBulder
FieldBuilder	Fields at runtime
LocalBuilder	Local variables
MethodBuilder	Methods at runtime
ModuleBuilder	Modules at runtime
ParameterBuilder	Method parameters at runtime
PropertyBuilder	Properties at runtime
TypeBuilder	Types at runtime

AssemblyName myTempName = new AssemblyName();
myTempName.Name = "MyTempAssembly";
AssemblyBuilder myAssemBldr = AppDomain.CurrentDomain.DefineDynamicAssembly(tempName, AssemblyBuilderAccess.RunAndSave);
ModuleBuilder modBldr = myAssemBldr.DefineDynamicModule("MainMod", "MyTempAssembly.dll");
TypeBuilder typeBldr = modBldr.DefineType("MyNewType", TypeAttributes.Public | TypeAttributes.Class);

TypeBuilder Definitions

 

Name	Description
DefineConstructor	Constructors
DefineDefaultConstructor	Parameterless constructor
DefineEvent	Events
DefineField	Fields
DefineGenericParameters	Generic parameters
DefineMethod	Methods
DefineMethodOverride	Overloads for methods
DefineNestedType	New types
DefinePInvokeMethod	Calls to external code
DefineProperty	Properties