C# TypeDefinition.AddDefaultConstructor方法代码示例

        public void AddConstructor(TypeDefinition adapterType,
           FieldReference targetField)
        {
            var adapterCtor = adapterType.AddDefaultConstructor();
            var adapterParameter = new ParameterDefinition(_targetDependency);
            adapterCtor.Parameters.Add(adapterParameter);

            // HACK: Remove the ret instruction from the default constructor and replace it with
            // the field setter
            var adapterBody = adapterCtor.Body;
            var adapterInstructions = adapterBody.Instructions.Cast<Instruction>().Where(i => i.OpCode != OpCodes.Ret).ToArray();
            adapterBody.Instructions.Clear();

            // Copy the old instructions
            var IL = adapterBody.CilWorker;
            foreach (var instruction in adapterInstructions)
            {
                IL.Append(instruction);
            }

            IL.Emit(OpCodes.Ldarg_0);
            IL.Emit(OpCodes.Ldarg, adapterParameter);
            IL.Emit(OpCodes.Stfld, targetField);
            IL.Emit(OpCodes.Ret);
        }

        private static void DefineSerializationConstructor(ModuleDefinition module, TypeDefinition targetType)
        {
            var getTypeFromHandle = module.ImportMethod<Type>("GetTypeFromHandle",
                BindingFlags.Public | BindingFlags.Static);

            var parameterTypes = new[] {typeof (SerializationInfo), typeof (StreamingContext)};

            // Define the constructor signature
            var serializationCtor = targetType.AddDefaultConstructor();
            serializationCtor.AddParameters(parameterTypes);

            serializationCtor.Attributes = MethodAttributes.HideBySig | MethodAttributes.SpecialName |
                                           MethodAttributes.RTSpecialName | MethodAttributes.Public;
            var interceptorInterfaceType = module.ImportType<IInterceptor>();
            var interceptorTypeVariable = serializationCtor.AddLocal<Type>();

            var body = serializationCtor.Body;
            body.InitLocals = true;

            var IL = serializationCtor.GetILGenerator();

            IL.Emit(OpCodes.Ldtoken, interceptorInterfaceType);
            IL.Emit(OpCodes.Call, getTypeFromHandle);
            IL.Emit(OpCodes.Stloc, interceptorTypeVariable);

            var defaultConstructor = module.ImportConstructor<object>();
            IL.Emit(OpCodes.Ldarg_0);
            IL.Emit(OpCodes.Call, defaultConstructor);

            // __interceptor = (IInterceptor)info.GetValue("__interceptor", typeof(IInterceptor));
            var getValue = module.ImportMethod<SerializationInfo>("GetValue");
            IL.Emit(OpCodes.Ldarg_0);
            IL.Emit(OpCodes.Ldarg_1);
            IL.Emit(OpCodes.Ldstr, "__interceptor");
            IL.Emit(OpCodes.Ldloc, interceptorTypeVariable);
            IL.Emit(OpCodes.Callvirt, getValue);
            IL.Emit(OpCodes.Castclass, interceptorInterfaceType);

            var setInterceptor = module.ImportMethod<IProxy>("set_Interceptor");
            IL.Emit(OpCodes.Callvirt, setInterceptor);
            ;
            IL.Emit(OpCodes.Ret);
        }

		static void SetDataTemplate(IElementNode parentNode, ElementNode node, ILContext parentContext,
			IXmlLineInfo xmlLineInfo)
		{
			var parentVar = parentContext.Variables[parentNode];
			//Push the DataTemplate to the stack, for setting the template
			parentContext.IL.Emit(OpCodes.Ldloc, parentVar);

			//Create nested class
			//			.class nested private auto ansi sealed beforefieldinit '<Main>c__AnonStorey0'
			//			extends [mscorlib]System.Object

			var module = parentContext.Body.Method.Module;
			var anonType = new TypeDefinition(
				null,
				"<" + parentContext.Body.Method.Name + ">_anonXamlCDataTemplate_" + dtcount++,
				TypeAttributes.BeforeFieldInit |
				TypeAttributes.Sealed |
				TypeAttributes.NestedPrivate)
			{
				BaseType = module.TypeSystem.Object
			};

			parentContext.Body.Method.DeclaringType.NestedTypes.Add(anonType);
			var ctor = anonType.AddDefaultConstructor();

			var loadTemplate = new MethodDefinition("LoadDataTemplate",
				MethodAttributes.Assembly | MethodAttributes.HideBySig,
				module.TypeSystem.Object);
			anonType.Methods.Add(loadTemplate);

			var parentValues = new FieldDefinition("parentValues", FieldAttributes.Assembly, module.Import(typeof (object[])));
			anonType.Fields.Add(parentValues);

			TypeReference rootType = null;
			var vdefRoot = parentContext.Root as VariableDefinition;
			if (vdefRoot != null)
				rootType = vdefRoot.VariableType;
			var fdefRoot = parentContext.Root as FieldDefinition;
			if (fdefRoot != null)
				rootType = fdefRoot.FieldType;

			var root = new FieldDefinition("root", FieldAttributes.Assembly, rootType);
			anonType.Fields.Add(root);

			//Fill the loadTemplate Body
			var templateIl = loadTemplate.Body.GetILProcessor();
			templateIl.Emit(OpCodes.Nop);
			var templateContext = new ILContext(templateIl, loadTemplate.Body, parentValues)
			{
				Root = root
			};
			node.Accept(new CreateObjectVisitor(templateContext), null);
			node.Accept(new SetNamescopesAndRegisterNamesVisitor(templateContext), null);
			node.Accept(new SetFieldVisitor(templateContext), null);
			node.Accept(new SetResourcesVisitor(templateContext), null);
			node.Accept(new SetPropertiesVisitor(templateContext), null);
			templateIl.Emit(OpCodes.Ldloc, templateContext.Variables[node]);
			templateIl.Emit(OpCodes.Ret);

			//Instanciate nested class
			var parentIl = parentContext.IL;
			parentIl.Emit(OpCodes.Newobj, ctor);

			//Copy required local vars
			parentIl.Emit(OpCodes.Dup); //Duplicate the nestedclass instance
			parentIl.Append(node.PushParentObjectsArray(parentContext));
			parentIl.Emit(OpCodes.Stfld, parentValues);
			parentIl.Emit(OpCodes.Dup); //Duplicate the nestedclass instance
			if (parentContext.Root is VariableDefinition)
				parentIl.Emit(OpCodes.Ldloc, parentContext.Root as VariableDefinition);
			else if (parentContext.Root is FieldDefinition)
			{
				parentIl.Emit(OpCodes.Ldarg_0);
				parentIl.Emit(OpCodes.Ldfld, parentContext.Root as FieldDefinition);
			}
			else
				throw new InvalidProgramException();
			parentIl.Emit(OpCodes.Stfld, root);

			//SetDataTemplate
			parentIl.Emit(OpCodes.Ldftn, loadTemplate);
			var funcCtor =
				module.Import(typeof (Func<>))
					.MakeGenericInstanceType(module.TypeSystem.Object)
					.Resolve()
					.Methods.First(md => md.IsConstructor && md.Parameters.Count == 2)
					.MakeGeneric(module.TypeSystem.Object);
			parentIl.Emit(OpCodes.Newobj, module.Import(funcCtor));

			var propertySetter =
				module.Import(typeof (IDataTemplate)).Resolve().Properties.First(p => p.Name == "LoadTemplate").SetMethod;
			parentContext.IL.Emit(OpCodes.Callvirt, module.Import(propertySetter));
		}

        /// <summary>
        /// Defines the nested constructors for the singleton type.
        /// </summary>
        /// <param name="module">The target module.</param>
        /// <param name="nestedType">The nested type.</param>
        /// <returns>The static singleton constructor.</returns>
        private static MethodDefinition DefineNestedConstructors(ModuleDefinition module, TypeDefinition nestedType)
        {
            // Define the constructor for the nested t ype
            nestedType.AddDefaultConstructor();
            var defaultConstructor = nestedType.GetDefaultConstructor();
            defaultConstructor.IsPublic = true;

            var cctor = DefineStaticConstructor(module, nestedType);
            cctor.IsPublic = true;

            return cctor;
        }