C# Emitters.ClassEmitter类代码示例

		public Expression[] GetConstructorInvocationArguments(Expression[] arguments, ClassEmitter proxy)
		{
			var allArguments = new Expression[arguments.Length + 1];
			allArguments[0] = new ReferenceExpression(BuildDelegateToken(proxy));
			Array.Copy(arguments, 0, allArguments, 1, arguments.Length);
			return allArguments;
		}

		protected override MethodGenerator GetMethodGenerator(MetaMethod method, ClassEmitter @class,
		                                                      ProxyGenerationOptions options,
		                                                      OverrideMethodDelegate overrideMethod)
		{
			if (methodsToSkip.Contains(method.Method))
			{
				return null;
			}

			if (!method.Proxyable)
			{
				return new MinimialisticMethodGenerator(method,
				                                        overrideMethod);
			}

			if (IsDirectlyAccessible(method) == false)
			{
				return IndirectlyCalledMethodGenerator(method, @class, options, overrideMethod);
			}

			var invocation = GetInvocationType(method, @class, options);

			return new MethodWithInvocationGenerator(method,
			                                         @class.GetField("__interceptors"),
			                                         invocation,
			                                         (c, m) => c.GetField("__target").ToExpression(),
			                                         overrideMethod,
			                                         null);
		}

		public virtual void Generate(ClassEmitter @class, ProxyGenerationOptions options)
		{
			foreach (var method in methods)
			{
				if (!method.Standalone)
				{
					continue;
				}

				ImplementMethod(method,
				                @class,
				                options,
				                @class.CreateMethod);
			}

			foreach (var property in properties)
			{
				ImplementProperty(@class, property, options);
			}

			foreach (var @event in events)
			{
				ImplementEvent(@class, @event, options);
			}
		}

		public void ForceUnsignedTrueWithSignedTypes()
		{
			ClassEmitter emitter = new ClassEmitter(generator.ProxyBuilder.ModuleScope, "Foo", typeof (object), Type.EmptyTypes,
			                                        TypeAttributes.Public, true);
			Type t = emitter.BuildType();
			Assert.IsFalse(StrongNameUtil.IsAssemblySigned(t.GetTypeInfo().Assembly));
		}

		/// <summary>
		/// Initializes a new instance of the AdapterBuilderContext class.
		/// </summary>
		/// <param name="originalObject"></param>
		/// <param name="classEmitter"></param>
		/// <param name="adaptedObjectRef"></param>
		public AdapterBuilderStageContext(Type originalObject, ClassEmitter classEmitter, FieldReference adaptedObjectRef, MethodInfo originalMethod)
		{
			OriginalObject = originalObject;
			ClassEmitter = classEmitter;
			AdaptedObjectRef = adaptedObjectRef;
			OriginalMethod = originalMethod;
		}

		private Type GetInvocationType(MetaMethod method, ClassEmitter @class, ProxyGenerationOptions options)
		{
			var scope = @class.ModuleScope;

			Type[] invocationInterfaces;
			if (canChangeTarget)
			{
				invocationInterfaces = new[] { typeof(IInvocation), typeof(IChangeProxyTarget) };
			}
			else
			{
				invocationInterfaces = new[] { typeof(IInvocation) };
			}

			var key = new CacheKey(method.Method, CompositionInvocationTypeGenerator.BaseType, invocationInterfaces, null);

			// no locking required as we're already within a lock

			var invocation = scope.GetFromCache(key);
			if (invocation != null)
			{
				return invocation;
			}

			invocation = new CompositionInvocationTypeGenerator(method.Method.DeclaringType,
			                                                    method,
			                                                    method.Method,
			                                                    canChangeTarget,
			                                                    null)
				.Generate(@class, options, namingScope).BuildType();

			scope.RegisterInCache(key, invocation);

			return invocation;
		}

		protected override MethodGenerator GetMethodGenerator(MetaMethod method, ClassEmitter @class,
		                                                      ProxyGenerationOptions options,
		                                                      OverrideMethodDelegate overrideMethod)
		{
			if (!method.Proxyable)
			{
				return new ForwardingMethodGenerator(method,
				                                     overrideMethod,
				                                     (c, m) => c.GetField("__target"));
			}

			var targetMethod = options.ProxyEffectiveType == null ? method.Method : InvocationHelper.GetMethodOnType(proxyTargetType, method.Method);

			if (targetMethod == null)
			{
				return new MinimialisticMethodGenerator(method, overrideMethod);
			}

			var invocation = GetInvocationType(method, targetMethod, @class, options);

			return new MethodWithInvocationGenerator(method,
			                                         @class.GetField("__interceptors"),
			                                         invocation,
			                                         (c, m) => c.GetField("__target").ToExpression(),
			                                         overrideMethod,
			                                         null);
		}

		private static TypeBuilder CreateTypeBuilder (ClassEmitter maintype, string name, Type baseType, Type[] interfaces)
		{
			return maintype.TypeBuilder.DefineNestedType (
				name,
				TypeAttributes.Sealed | TypeAttributes.NestedPublic | TypeAttributes.Class,
				baseType, interfaces);
		}

		public void AutomaticDefaultConstructorGenerationWithClosedGenericType()
		{
			ClassEmitter emitter = new ClassEmitter(generator.ProxyBuilder.ModuleScope, "Foo", typeof (List<object>),
			                                        Type.EmptyTypes);
			Type t = emitter.BuildType();
			Activator.CreateInstance(t);
		}

		protected override MethodGenerator GetMethodGenerator(MetaMethod method, ClassEmitter @class,
		                                                      ProxyGenerationOptions options,
		                                                      OverrideMethodDelegate overrideMethod)
		{
			if (methodsToSkip.Contains(method.Method))
				return null;

			if (!method.Proxyable)
			{
				return new MinimialisticMethodGenerator(method,
				                                        overrideMethod);
			}

			if (ExplicitlyImplementedInterfaceMethod(method))
			{
#if SILVERLIGHT
				return null;
#else
				return ExplicitlyImplementedInterfaceMethodGenerator(method, @class, options, overrideMethod);
#endif
			}

			var invocation = GetInvocationType(method, @class, options);

			return new MethodWithInvocationGenerator(method,
			                                         @class.GetField("__interceptors"),
			                                         invocation,
			                                         (c, m) => new TypeTokenExpression(targetType),
			                                         overrideMethod,
			                                         null);
		}

		// 重载 InterfaceProxyWithTargetInterfaceContributor 中的方法，以指定使用扩展的 InvocationType 生成方法执行类
		protected override MethodGenerator GetMethodGenerator(MetaMethod method, ClassEmitter @class, ProxyGenerationOptions options, OverrideMethodDelegate overrideMethod)
		{
			if (!method.Proxyable)
			{
				return new MinimialisticMethodGenerator(method, overrideMethod);
			}
			return new MethodWithInvocationGenerator(method, @class.GetField("__interceptors"), this.GetInvocationType(method, @class, options), this.getTargetExpression, overrideMethod, null);
		}

		public void ForceUnsignedFalseWithSignedTypes()
		{
			const bool shouldBeSigned = true;
			ClassEmitter emitter = new ClassEmitter(generator.ProxyBuilder.ModuleScope, "Foo", typeof (object), Type.EmptyTypes,
			                                        TypeAttributes.Public, false);
			Type t = emitter.BuildType();
			Assert.AreEqual(shouldBeSigned, StrongNameUtil.IsAssemblySigned(t.GetTypeInfo().Assembly));
		}

		private FieldReference CreateTargetField(ClassEmitter emitter)
		{
			var targetField = emitter.CreateField("__target", targetType);
#if FEATURE_SERIALIZATION
			emitter.DefineCustomAttributeFor<XmlIgnoreAttribute>(targetField);
#endif
			return targetField;
		}

		private FieldReference CreateTargetField(ClassEmitter emitter)
		{
			var targetField = emitter.CreateField("__target", targetType);
#if !SILVERLIGHT
			emitter.DefineCustomAttributeFor<XmlIgnoreAttribute>(targetField);
#endif
			return targetField;
		}

		public void StaticMethodArguments ()
		{
			ClassEmitter emitter = new ClassEmitter (generator.ProxyBuilder.ModuleScope, "Foo", typeof (List<object>), Type.EmptyTypes);
			MethodEmitter methodEmitter = emitter.CreateMethod ("StaticMethod", MethodAttributes.Public | MethodAttributes.Static,
					typeof (string), typeof (string));
			methodEmitter.CodeBuilder.AddStatement (new ReturnStatement (methodEmitter.Arguments[0]));
			Type t = emitter.BuildType ();
			Assert.AreEqual ("five", t.GetMethod ("StaticMethod").Invoke (null, new object[] { "five" }));
		}