private static string GetCountOrLengthPropertyName(
ExpressionSyntax expression,
SemanticModel semanticModel,
CancellationToken cancellationToken = default(CancellationToken))
{
ITypeSymbol typeSymbol = semanticModel
.GetTypeInfo(expression, cancellationToken)
.Type;
if (typeSymbol?.IsErrorType() == false &&
!SyntaxAnalyzer.IsGenericIEnumerable(typeSymbol))
{
if (typeSymbol.BaseType?.SpecialType == SpecialType.System_Array)
{
return("Length");
}
if (SyntaxAnalyzer.IsGenericImmutableArray(typeSymbol, semanticModel))
{
return("Length");
}
ImmutableArray <INamedTypeSymbol> allInterfaces = typeSymbol.AllInterfaces;
for (int i = 0; i < allInterfaces.Length; i++)
{
if (allInterfaces[i].ConstructedFrom.SpecialType == SpecialType.System_Collections_Generic_ICollection_T)
{
foreach (ISymbol members in typeSymbol.GetMembers("Count"))
{
if (members.IsProperty() &&
members.IsPublic())
{
return("Count");
}
}
}
}
}
return(null);
}
private static bool IsImmutableArrayElementAtMethod(
InvocationExpressionSyntax invocation,
SemanticModel semanticModel)
{
var methodSymbol = semanticModel
.GetSymbolInfo(invocation)
.Symbol as IMethodSymbol;
if (methodSymbol?.ReducedFrom != null)
{
methodSymbol = methodSymbol.ReducedFrom;
return(methodSymbol.MetadataName == "ElementAt" &&
methodSymbol.Parameters.Length == 2 &&
methodSymbol.ContainingType?.Equals(semanticModel.Compilation.GetTypeByMetadataName("System.Linq.ImmutableArrayExtensions")) == true &&
SyntaxAnalyzer.IsGenericImmutableArray(methodSymbol.Parameters[0].Type, semanticModel) &&
methodSymbol.Parameters[1].Type.IsInt32());
}
return(false);
}