示例#1
0
        private static ParameterSymbol GetThisParameter(TypeSymbol typeOfThis, NamedTypeSymbol containingType, Symbol containingMember, out LookupResultKind resultKind)
        {
            if ((object)containingMember == null || (object)containingType == null)
            {
                // not in a member of a type (can happen when speculating)
                resultKind = LookupResultKind.NotReferencable;
                return new ThisParameterSymbol(containingMember as MethodSymbol, typeOfThis);
            }

            ParameterSymbol thisParam;

            switch (containingMember.Kind)
            {
                case SymbolKind.Method:
                case SymbolKind.Field:
                case SymbolKind.Property:
                    if (containingMember.IsStatic)
                    {
                        // in a static member
                        resultKind = LookupResultKind.StaticInstanceMismatch;
                        thisParam = new ThisParameterSymbol(containingMember as MethodSymbol, containingType);
                    }
                    else
                    {
                        if ((object)typeOfThis == ErrorTypeSymbol.UnknownResultType)
                        {
                            // in an instance member, but binder considered this/base unreferenceable
                            thisParam = new ThisParameterSymbol(containingMember as MethodSymbol, containingType);
                            resultKind = LookupResultKind.NotReferencable;
                        }
                        else
                        {
                            switch (containingMember.Kind)
                            {
                                case SymbolKind.Method:
                                    resultKind = LookupResultKind.Viable;
                                    thisParam = containingMember.EnclosingThisSymbol();
                                    break;

                                // Fields and properties can't access 'this' since
                                // initializers are run in the constructor    
                                case SymbolKind.Field:
                                case SymbolKind.Property:
                                    resultKind = LookupResultKind.NotReferencable;
                                    thisParam = containingMember.EnclosingThisSymbol() ?? new ThisParameterSymbol(null, containingType);
                                    break;

                                default:
                                    throw ExceptionUtilities.UnexpectedValue(containingMember.Kind);
                            }
                        }
                    }
                    break;

                default:
                    thisParam = new ThisParameterSymbol(containingMember as MethodSymbol, typeOfThis);
                    resultKind = LookupResultKind.NotReferencable;
                    break;
            }

            return thisParam;
        }