private SyntaxNode MapCollections(SyntaxNode sourceAccess, ITypeSymbol sourceListType, ITypeSymbol targetListType, MappingPath mappingPath, MappingContext mappingContext) { var isReadonlyCollection = ObjectHelper.IsReadonlyCollection(targetListType); var sourceListElementType = MappingHelper.GetElementType(sourceListType); var targetListElementType = MappingHelper.GetElementType(targetListType); if (ShouldCreateConversionBetweenTypes(targetListElementType, sourceListElementType)) { var useConvert = CanUseConvert(sourceListType); var selectAccess = useConvert ? syntaxGenerator.MemberAccessExpression(sourceAccess, "ConvertAll"): syntaxGenerator.MemberAccessExpression(sourceAccess, "Select"); var lambdaParameterName = NameHelper.CreateLambdaParameterName(sourceAccess); var mappingLambda = CreateMappingLambda(lambdaParameterName, sourceListElementType, targetListElementType, mappingPath, mappingContext); var selectInvocation = syntaxGenerator.InvocationExpression(selectAccess, mappingLambda); var toList = useConvert? selectInvocation: AddMaterializeCollectionInvocation(syntaxGenerator, selectInvocation, targetListType); return(MappingHelper.WrapInReadonlyCollectionIfNecessary(toList, isReadonlyCollection, syntaxGenerator)); } var toListInvocation = AddMaterializeCollectionInvocation(syntaxGenerator, sourceAccess, targetListType); return(MappingHelper.WrapInReadonlyCollectionIfNecessary(toListInvocation, isReadonlyCollection, syntaxGenerator)); }