C# INamingScope类代码示例

		protected virtual IEnumerable<Type> GetTypeImplementerMapping(out IEnumerable<ITypeContributor> contributors,
		                                                              INamingScope namingScope)
		{
			var methodsToSkip = new List<MethodInfo>();
			var proxyInstance = new ClassProxyInstanceContributor(targetType, methodsToSkip, Type.EmptyTypes,
			                                                      ProxyTypeConstants.ClassWithTarget);
			var proxyTarget = new DelegateProxyTargetContributor(targetType, namingScope) { Logger = Logger };
			IDictionary<Type, ITypeContributor> typeImplementerMapping = new Dictionary<Type, ITypeContributor>();

			// Order of interface precedence:
			// 1. first target, target is not an interface so we do nothing
			// 2. then mixins - we support none so we do nothing
			// 3. then additional interfaces - we support none so we do nothing
#if !SILVERLIGHT
			// 4. plus special interfaces
			if (targetType.IsSerializable)
			{
				AddMappingForISerializable(typeImplementerMapping, proxyInstance);
			}
#endif
			AddMappingNoCheck(typeof(IProxyTargetAccessor), proxyInstance, typeImplementerMapping);

			contributors = new List<ITypeContributor>
			{
				proxyTarget,
				proxyInstance
			};
			return typeImplementerMapping.Keys;
		}

		protected virtual ITypeContributor AddMappingForTargetType(IDictionary<Type, ITypeContributor> typeImplementerMapping,
		                                                           Type proxyTargetType, ICollection<Type> targetInterfaces,
		                                                           ICollection<Type> additionalInterfaces,
		                                                           INamingScope namingScope)
		{
			var contributor = new InterfaceProxyTargetContributor(proxyTargetType, AllowChangeTarget, namingScope)
			{ Logger = Logger };
			var proxiedInterfaces = targetType.GetAllInterfaces();
			foreach (var @interface in proxiedInterfaces)
			{
				contributor.AddInterfaceToProxy(@interface);
				AddMappingNoCheck(@interface, contributor, typeImplementerMapping);
			}

			foreach (var @interface in additionalInterfaces)
			{
				if (!ImplementedByTarget(targetInterfaces, @interface) || proxiedInterfaces.Contains(@interface))
				{
					continue;
				}

				contributor.AddInterfaceToProxy(@interface);
				AddMappingNoCheck(@interface, contributor, typeImplementerMapping);
			}
			return contributor;
		}

		public ClassProxyWithTargetTargetContributor(Type targetType, IList<MethodInfo> methodsToSkip,
		                                             INamingScope namingScope)
			: base(namingScope)
		{
			this.targetType = targetType;
			this.methodsToSkip = methodsToSkip;
		}

 public InterfaceProxyWithOptionalTargetContributor(INamingScope namingScope, GetTargetExpressionDelegate getTarget,
                                                    GetTargetReferenceDelegate getTargetReference)
     : base(namingScope, getTarget)
 {
     this.getTargetReference = getTargetReference;
     canChangeTarget = true;
 }

		public InvocationWithDelegateContributor(Type delegateType, Type targetType,MetaMethod method, INamingScope namingScope)
		{
			Debug.Assert(delegateType.IsGenericType == false, "delegateType.IsGenericType == false");
			this.delegateType = delegateType;
			this.targetType = targetType;
			this.method = method;
			this.namingScope = namingScope;
		}

		private Type GenerateType(string name, INamingScope namingScope)
		{
			IEnumerable<ITypeContributor> contributors;
			var implementedInterfaces = GetTypeImplementerMapping(out contributors, namingScope);

			var model = new MetaType();
			// Collect methods
			foreach (var contributor in contributors)
			{
				contributor.CollectElementsToProxy(ProxyGenerationOptions.Hook, model);
			}
			ProxyGenerationOptions.Hook.MethodsInspected();

			var emitter = BuildClassEmitter(name, targetType, implementedInterfaces);

			CreateFields(emitter);
			CreateTypeAttributes(emitter);


			// Constructor
			var cctor = GenerateStaticConstructor(emitter);

			var targetField = CreateTargetField(emitter);
			var constructorArguments = new List<FieldReference> { targetField };

			foreach (var contributor in contributors)
			{
				contributor.Generate(emitter, ProxyGenerationOptions);

				// TODO: redo it
				if (contributor is MixinContributor)
				{
					constructorArguments.AddRange((contributor as MixinContributor).Fields);
				}
			}
			
			// constructor arguments
			var interceptorsField = emitter.GetField("__interceptors");
			constructorArguments.Add(interceptorsField);
			var selector = emitter.GetField("__selector");
			if (selector != null)
			{
				constructorArguments.Add(selector);
			}

			GenerateConstructors(emitter, targetType, constructorArguments.ToArray());
			GenerateParameterlessConstructor(emitter, targetType, interceptorsField);

			// Complete type initializer code body
			CompleteInitCacheMethod(cctor.CodeBuilder);

			// Crosses fingers and build type

			Type proxyType = emitter.BuildType();
			InitializeStaticFields(proxyType);
			return proxyType;
		}

		protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class,
		                                                        ProxyGenerationOptions options, INamingScope namingScope)
		{
			var targetReference = getTargetReference(@class, MethodToOverride);

			emitter.CodeBuilder.AddStatement(
				new ExpressionStatement(
					new IfNullExpression(targetReference, IfNull(emitter.ReturnType), IfNotNull(targetReference))));
			return emitter;
		}

		protected FieldReference BuildMethodInterceptorsField(ClassEmitter @class, MethodInfo method, INamingScope namingScope)
		{
			var methodInterceptors = @class.CreateField(
				namingScope.GetUniqueName(string.Format("interceptors_{0}", method.Name)),
				typeof(IInterceptor[]),
				false);
#if !SILVERLIGHT
			@class.DefineCustomAttributeFor<XmlIgnoreAttribute>(methodInterceptors);
#endif
			return methodInterceptors;
		}

		protected override ITypeContributor AddMappingForTargetType(IDictionary<Type, ITypeContributor> interfaceTypeImplementerMapping, Type proxyTargetType, ICollection<Type> targetInterfaces, ICollection<Type> additionalInterfaces, INamingScope namingScope)
		{
			var contributor = new InterfaceProxyWithoutTargetContributor(namingScope, (c, m) => NullExpression.Instance)
			{ Logger = Logger };
			foreach (var @interface in TypeUtil.GetAllInterfaces(targetType))
			{
				contributor.AddInterfaceToProxy(@interface);
				AddMappingNoCheck(@interface, contributor, interfaceTypeImplementerMapping);
			}
			return contributor;
		}

		protected override Type GenerateType(string typeName, Type proxyTargetType, Type[] interfaces,
		                                     INamingScope namingScope)
		{
			IEnumerable<ITypeContributor> contributors;
			var allInterfaces = GetTypeImplementerMapping(interfaces, targetType, out contributors, namingScope);
			var model = new MetaType();
			// collect elements
			foreach (var contributor in contributors)
			{
				contributor.CollectElementsToProxy(ProxyGenerationOptions.Hook, model);
			}

			ProxyGenerationOptions.Hook.MethodsInspected();

			ClassEmitter emitter;
			FieldReference interceptorsField;
			var baseType = Init(typeName, out emitter, proxyTargetType, out interceptorsField, allInterfaces);

			// Constructor

			var cctor = GenerateStaticConstructor(emitter);
			var mixinFieldsList = new List<FieldReference>();

			foreach (var contributor in contributors)
			{
				contributor.Generate(emitter, ProxyGenerationOptions);

				// TODO: redo it
				if (contributor is MixinContributor)
				{
					mixinFieldsList.AddRange((contributor as MixinContributor).Fields);
				}
			}

			var ctorArguments = new List<FieldReference>(mixinFieldsList) { interceptorsField, 
                targetField };
			var selector = emitter.GetField("__selector");
			if (selector != null)
			{
				ctorArguments.Add(selector);
			}

			GenerateConstructors(emitter, baseType, ctorArguments.ToArray());

			// Complete type initializer code body
			CompleteInitCacheMethod(cctor.CodeBuilder);

			// Crosses fingers and build type
			var generatedType = emitter.BuildType();

			InitializeStaticFields(generatedType);
			return generatedType;
		}

		protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class, ProxyGenerationOptions options, INamingScope namingScope)
		{
			var targetReference = getTargetReference(@class, MethodToOverride);
			var arguments = ArgumentsUtil.ConvertToArgumentReferenceExpression(MethodToOverride.GetParameters());

			emitter.CodeBuilder.AddStatement(new ReturnStatement(
			                                 	new MethodInvocationExpression(
			                                 		targetReference,
			                                 		MethodToOverride,
			                                 		arguments) { VirtualCall = true }));
			return emitter;
		}

		protected override ITypeContributor AddMappingForTargetType(IDictionary<Type, ITypeContributor> typeImplementerMapping, Type proxyTargetType, ICollection<Type> targetInterfaces, ICollection<Type> additionalInterfaces, INamingScope namingScope)
		{
			WCFInterfaceProxyWithTargetInterfaceTargetContributor contributor = new WCFInterfaceProxyWithTargetInterfaceTargetContributor(proxyTargetType, this.AllowChangeTarget, namingScope)
			{
				Logger = base.Logger
			};
			foreach (Type @interface in base.targetType.GetAllInterfaces())
			{
				contributor.AddInterfaceToProxy(@interface);
				base.AddMappingNoCheck(@interface, contributor, typeImplementerMapping);
			}
			return contributor;
		}

		protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class, ProxyGenerationOptions options, INamingScope namingScope)
		{
			InitOutParameters(emitter, MethodToOverride.GetParameters());

			if (emitter.ReturnType == typeof(void))
			{
				emitter.CodeBuilder.AddStatement(new ReturnStatement());
			}
			else
			{
				emitter.CodeBuilder.AddStatement(new ReturnStatement(new DefaultValueExpression(emitter.ReturnType)));
			}

			return emitter;
		}

		protected override Type GenerateType(string typeName, Type proxyTargetType, Type[] interfaces, INamingScope namingScope)
		{
			IEnumerable<ITypeContributor> contributors;
			ClassEmitter emitter;
			FieldReference interceptorsField;
			IEnumerable<Type> allInterfaces = this.GetTypeImplementerMapping(interfaces, base.targetType, out contributors, namingScope);
			MetaType model = new MetaType();
			foreach (ITypeContributor contributor in contributors)
			{
				contributor.CollectElementsToProxy(base.ProxyGenerationOptions.Hook, model);
			}
			base.ProxyGenerationOptions.Hook.MethodsInspected();
			Type baseType = this.Init(typeName, out emitter, proxyTargetType, out interceptorsField, allInterfaces);
			ConstructorEmitter cctor = base.GenerateStaticConstructor(emitter);
			List<FieldReference> mixinFieldsList = new List<FieldReference>();
			foreach (ITypeContributor contributor in contributors)
			{
				contributor.Generate(emitter, base.ProxyGenerationOptions);
				if (contributor is MixinContributor)
				{
					mixinFieldsList.AddRange((contributor as MixinContributor).Fields);
				}
			}
			List<FieldReference> g__initLocalc = new List<FieldReference>(mixinFieldsList) {
            interceptorsField,
            base.targetField
        };
			List<FieldReference> ctorArguments = g__initLocalc;
			FieldReference selector = emitter.GetField("__selector");
			if (selector != null)
			{
				ctorArguments.Add(selector);
			}
			base.GenerateConstructors(emitter, baseType, ctorArguments.ToArray());
			base.CompleteInitCacheMethod(cctor.CodeBuilder);
			Type generatedType = emitter.BuildType();
			base.InitializeStaticFields(generatedType);
			return generatedType;
		}

		protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class, ProxyGenerationOptions options,INamingScope namingScope)
		{
			var invocationType = invocation;

			Trace.Assert(MethodToOverride.IsGenericMethod == invocationType.IsGenericTypeDefinition);
			Type[] genericMethodArgs = Type.EmptyTypes;

			ConstructorInfo constructor = invocation.GetConstructors()[0];


			Expression proxiedMethodTokenExpression;
			if (MethodToOverride.IsGenericMethod)
			{
				// bind generic method arguments to invocation's type arguments
				genericMethodArgs = emitter.MethodBuilder.GetGenericArguments();
				invocationType = invocationType.MakeGenericType(genericMethodArgs);
				constructor = TypeBuilder.GetConstructor(invocationType, constructor);

				// Not in the cache: generic method
				proxiedMethodTokenExpression = new MethodTokenExpression(MethodToOverride.MakeGenericMethod(genericMethodArgs));
			}
			else
			{
				var proxiedMethodToken = @class.CreateStaticField(namingScope.GetUniqueName("token_" + MethodToOverride.Name), typeof(MethodInfo));
				@class.ClassConstructor.CodeBuilder.AddStatement(new AssignStatement(proxiedMethodToken, new MethodTokenExpression(MethodToOverride)));
				
				proxiedMethodTokenExpression = proxiedMethodToken.ToExpression();
			}

			var dereferencedArguments = IndirectReference.WrapIfByRef(emitter.Arguments);


			var ctorArguments = GetCtorArguments(@class, namingScope, proxiedMethodTokenExpression, dereferencedArguments);

			var invocationLocal = emitter.CodeBuilder.DeclareLocal(invocationType);
			emitter.CodeBuilder.AddStatement(new AssignStatement(invocationLocal,
			                                                     new NewInstanceExpression(constructor, ctorArguments)));

			if (MethodToOverride.ContainsGenericParameters)
			{
				EmitLoadGenricMethodArguments(emitter, MethodToOverride.MakeGenericMethod(genericMethodArgs), invocationLocal);
			}

			emitter.CodeBuilder.AddStatement(
				new ExpressionStatement(new MethodInvocationExpression(invocationLocal, InvocationMethods.Proceed)));

			GeneratorUtil.CopyOutAndRefParameters(dereferencedArguments, invocationLocal, MethodToOverride, emitter);

			if (MethodToOverride.ReturnType != typeof(void))
			{
				// Emit code to return with cast from ReturnValue
				var getRetVal = new MethodInvocationExpression(invocationLocal, InvocationMethods.GetReturnValue);
				emitter.CodeBuilder.AddStatement(new ReturnStatement(new ConvertExpression(emitter.ReturnType, getRetVal)));
			}
			else
			{
				emitter.CodeBuilder.AddStatement(new ReturnStatement());
			}

			return emitter;
		}