C# ResolveResult.Select方法代码示例

		/// <summary>
		/// Resolves an indexer access.
		/// </summary>
		/// <param name="target">Target expression.</param>
		/// <param name="arguments">
		/// Arguments passed to the indexer.
		/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
		/// </param>
		/// <param name="argumentNames">
		/// The argument names. Pass the null string for positional arguments.
		/// </param>
		/// <returns>ArrayAccessResolveResult, InvocationResolveResult, or ErrorResolveResult</returns>
		public ResolveResult ResolveIndexer(ResolveResult target, ResolveResult[] arguments, string[] argumentNames = null)
		{
			switch (target.Type.Kind) {
				case TypeKind.Dynamic:
					return new DynamicInvocationResolveResult(target, DynamicInvocationType.Indexing, arguments.Select((a, i) => new DynamicInvocationArgument(argumentNames != null ? argumentNames[i] : null, a)).ToList().AsReadOnly());
					
				case TypeKind.Array:
				case TypeKind.Pointer:
					// §7.6.6.1 Array access / §18.5.3 Pointer element access
					AdjustArrayAccessArguments(arguments);
					return new ArrayAccessResolveResult(((TypeWithElementType)target.Type).ElementType, target, arguments);
			}
			
			// §7.6.6.2 Indexer access

			MemberLookup lookup = CreateMemberLookup();
			var indexers = lookup.LookupIndexers(target.Type);

			if (arguments.Any(a => a.Type.Kind == TypeKind.Dynamic)) {
				// If we have dynamic arguments, we need to represent the invocation as a dynamic invocation if there is more than one applicable indexer.
				var or2 = CreateOverloadResolution(arguments, argumentNames, null);
				var applicableIndexers = indexers.SelectMany(x => x).Where(m => OverloadResolution.IsApplicable(or2.AddCandidate(m))).ToList();

				if (applicableIndexers.Count > 1) {
					return new DynamicInvocationResolveResult(target, DynamicInvocationType.Indexing, arguments.Select((a, i) => new DynamicInvocationArgument(argumentNames != null ? argumentNames[i] : null, a)).ToList().AsReadOnly());
				}
			}

			OverloadResolution or = CreateOverloadResolution(arguments, argumentNames);
			or.AddMethodLists(indexers);
			if (or.BestCandidate != null) {
				return or.CreateResolveResult(target);
			} else {
				return ErrorResult;
			}
		}

		/// <summary>
		/// Resolves an object creation.
		/// </summary>
		/// <param name="type">Type of the object to create.</param>
		/// <param name="arguments">
		/// Arguments passed to the constructor.
		/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
		/// </param>
		/// <param name="argumentNames">
		/// The argument names. Pass the null string for positional arguments.
		/// </param>
		/// <param name="allowProtectedAccess">
		/// Whether to allow calling protected constructors.
		/// This should be false except when resolving constructor initializers.
		/// </param>
		/// <param name="initializerStatements">
		/// Statements for Objects/Collections initializer.
		/// <see cref="InvocationResolveResult.InitializerStatements"/>
		/// </param>
		/// <returns>InvocationResolveResult or ErrorResolveResult</returns>
		public ResolveResult ResolveObjectCreation(IType type, ResolveResult[] arguments, string[] argumentNames = null, bool allowProtectedAccess = false, IList<ResolveResult> initializerStatements = null)
		{
			if (type.Kind == TypeKind.Delegate && arguments.Length == 1) {
				ResolveResult input = arguments[0];
				IMethod invoke = input.Type.GetDelegateInvokeMethod();
				if (invoke != null) {
					input = new MethodGroupResolveResult(
						input, invoke.Name,
						methods: new[] { new MethodListWithDeclaringType(invoke.DeclaringType) { invoke } },
						typeArguments: EmptyList<IType>.Instance
					);
				}
				return Convert(input, type);
			}
			OverloadResolution or = CreateOverloadResolution(arguments, argumentNames);
			MemberLookup lookup = CreateMemberLookup();
			var allApplicable = (arguments.Any(a => a.Type.Kind == TypeKind.Dynamic) ? new List<IMethod>() : null);
			foreach (IMethod ctor in type.GetConstructors()) {
				if (lookup.IsAccessible(ctor, allowProtectedAccess)) {
					var orErrors = or.AddCandidate(ctor);
					if (allApplicable != null && OverloadResolution.IsApplicable(orErrors))
						allApplicable.Add(ctor);
				}
				else
					or.AddCandidate(ctor, OverloadResolutionErrors.Inaccessible);
			}

			if (allApplicable != null && allApplicable.Count > 1) {
				// If we have dynamic arguments, we need to represent the invocation as a dynamic invocation if there is more than one applicable constructor.
				return new DynamicInvocationResolveResult(new MethodGroupResolveResult(null, allApplicable[0].Name, new[] { new MethodListWithDeclaringType(type, allApplicable) }, null), DynamicInvocationType.ObjectCreation, arguments.Select((a, i) => new DynamicInvocationArgument(argumentNames != null ? argumentNames[i] : null, a)).ToList().AsReadOnly(), initializerStatements);
			}

			if (or.BestCandidate != null) {
				return or.CreateResolveResult(null, initializerStatements);
			} else {
				return new ErrorResolveResult(type);
			}
		}

		/// <summary>
		/// Resolves an invocation.
		/// </summary>
		/// <param name="target">The target of the invocation. Usually a MethodGroupResolveResult.</param>
		/// <param name="arguments">
		/// Arguments passed to the method.
		/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
		/// </param>
		/// <param name="argumentNames">
		/// The argument names. Pass the null string for positional arguments.
		/// </param>
		/// <returns>InvocationResolveResult or UnknownMethodResolveResult</returns>
		public ResolveResult ResolveInvocation(ResolveResult target, ResolveResult[] arguments, string[] argumentNames = null)
		{
			// C# 4.0 spec: §7.6.5
			
			if (target.Type.Kind == TypeKind.Dynamic) {
				return new DynamicInvocationResolveResult(target, DynamicInvocationType.Invocation, arguments.Select((a, i) => new DynamicInvocationArgument(argumentNames != null ? argumentNames[i] : null, a)).ToList().AsReadOnly());
			}
			
			MethodGroupResolveResult mgrr = target as MethodGroupResolveResult;
			if (mgrr != null) {
				if (arguments.Any(a => a.Type.Kind == TypeKind.Dynamic)) {
					// If we have dynamic arguments, we need to represent the invocation as a dynamic invocation if there is more than one applicable method.
					var or2 = CreateOverloadResolution(arguments, argumentNames, mgrr.TypeArguments.ToArray());
					var applicableMethods = mgrr.MethodsGroupedByDeclaringType.SelectMany(m => m, (x, m) => new { x.DeclaringType, Method = m }).Where(x => OverloadResolution.IsApplicable(or2.AddCandidate(x.Method))).ToList();

					if (applicableMethods.Count > 1) {
						ResolveResult actualTarget;
						if (applicableMethods.All(x => x.Method.IsStatic) && !(mgrr.TargetResult is TypeResolveResult))
							actualTarget = new TypeResolveResult(mgrr.TargetType);
						else
							actualTarget = mgrr.TargetResult;

						var l = new List<MethodListWithDeclaringType>();
						foreach (var m in applicableMethods) {
							if (l.Count == 0 || l[l.Count - 1].DeclaringType != m.DeclaringType)
								l.Add(new MethodListWithDeclaringType(m.DeclaringType));
							l[l.Count - 1].Add(m.Method);
						}
						return new DynamicInvocationResolveResult(new MethodGroupResolveResult(actualTarget, mgrr.MethodName, l, mgrr.TypeArguments), DynamicInvocationType.Invocation, arguments.Select((a, i) => new DynamicInvocationArgument(argumentNames != null ? argumentNames[i] : null, a)).ToList().AsReadOnly());
					}
				}

				OverloadResolution or = mgrr.PerformOverloadResolution(compilation, arguments, argumentNames, checkForOverflow: checkForOverflow, conversions: conversions);
				if (or.BestCandidate != null) {
					if (or.BestCandidate.IsStatic && !or.IsExtensionMethodInvocation && !(mgrr.TargetResult is TypeResolveResult))
						return or.CreateResolveResult(new TypeResolveResult(mgrr.TargetType));
					else
						return or.CreateResolveResult(mgrr.TargetResult);
				} else {
					// No candidate found at all (not even an inapplicable one).
					// This can happen with empty method groups (as sometimes used with extension methods)
					return new UnknownMethodResolveResult(
						mgrr.TargetType, mgrr.MethodName, mgrr.TypeArguments, CreateParameters(arguments, argumentNames));
				}
			}
			UnknownMemberResolveResult umrr = target as UnknownMemberResolveResult;
			if (umrr != null) {
				return new UnknownMethodResolveResult(umrr.TargetType, umrr.MemberName, umrr.TypeArguments, CreateParameters(arguments, argumentNames));
			}
			UnknownIdentifierResolveResult uirr = target as UnknownIdentifierResolveResult;
			if (uirr != null && CurrentTypeDefinition != null) {
				return new UnknownMethodResolveResult(CurrentTypeDefinition, uirr.Identifier, EmptyList<IType>.Instance, CreateParameters(arguments, argumentNames));
			}
			IMethod invokeMethod = target.Type.GetDelegateInvokeMethod();
			if (invokeMethod != null) {
				OverloadResolution or = CreateOverloadResolution(arguments, argumentNames);
				or.AddCandidate(invokeMethod);
				return new CSharpInvocationResolveResult(
					target, invokeMethod, //invokeMethod.ReturnType.Resolve(context),
					or.GetArgumentsWithConversions(), or.BestCandidateErrors,
					isExpandedForm: or.BestCandidateIsExpandedForm,
					isDelegateInvocation: true,
					argumentToParameterMap: or.GetArgumentToParameterMap());
			}
			return ErrorResult;
		}