static private IsEligibleExtensionMethod ( ICompilation compilation, CSharpConversions conversions, IType targetType, IMethod method, bool useTypeInference, IType &outInferredTypes ) : bool | ||
compilation | ICompilation | |
conversions | CSharpConversions | |
targetType | IType | |
method | IMethod | |
useTypeInference | bool | |
outInferredTypes | IType | |
return | bool |
/// <summary> /// Gets the eligible extension methods. /// </summary> /// <param name="substituteInferredTypes"> /// Specifies whether to produce a <see cref="SpecializedMethod"/> /// when type arguments could be inferred from <see cref="TargetType"/>. /// This setting is only used for inferred types and has no effect if the type parameters are /// specified explicitly. /// </param> /// <remarks> /// The results are stored in nested lists because they are grouped by using scope. /// That is, for "using SomeExtensions; namespace X { using MoreExtensions; ... }", /// the return value will be /// new List { /// new List { all extensions from MoreExtensions }, /// new List { all extensions from SomeExtensions } /// } /// </remarks> public IEnumerable <IEnumerable <IMethod> > GetEligibleExtensionMethods(bool substituteInferredTypes) { var result = new List <List <IMethod> >(); foreach (var methodGroup in GetExtensionMethods()) { var outputGroup = new List <IMethod>(); foreach (var method in methodGroup) { IType[] inferredTypes; if (CSharpResolver.IsEligibleExtensionMethod(this.TargetType, method, true, out inferredTypes)) { if (substituteInferredTypes && inferredTypes != null) { outputGroup.Add(method.Specialize(new TypeParameterSubstitution(null, inferredTypes))); } else { outputGroup.Add(method); } } } if (outputGroup.Count > 0) { result.Add(outputGroup); } } return(result); }
public void FirstIsEligibleExtensionMethod() { string program = @"using System; using System.Collections.Generic; public static class XC { $public static TSource First<TSource>(this IEnumerable<TSource> source) {}$ } "; var mrr = Resolve <MemberResolveResult>(program); var targetType = compilation.FindType(typeof(string[])); IType[] inferredTypes; bool isEligible = CSharpResolver.IsEligibleExtensionMethod(targetType, (IMethod)mrr.Member, true, out inferredTypes); Assert.IsTrue(isEligible); Assert.AreEqual(1, inferredTypes.Length); Assert.AreEqual("System.String", inferredTypes[0].ReflectionName); }