private static void CheckForIsAssignableFrom(SyntaxNodeAnalysisContext context, InvocationExpressionSyntax invocation,
MemberAccessExpressionSyntax memberAccess, IMethodSymbol methodSymbol,
ExpressionSyntax argument)
{
if (methodSymbol.Name != "IsAssignableFrom" ||
!TypeExaminationOnSystemType.IsGetTypeCall(argument as InvocationExpressionSyntax, context.SemanticModel))
{
return;
}
if (memberAccess.Expression is TypeOfExpressionSyntax)
{
context.ReportDiagnostic(Diagnostic.Create(Rule, invocation.GetLocation(),
ImmutableDictionary <string, string> .Empty
.Add(UseIsOperatorKey, true.ToString())
.Add(ShouldRemoveGetType, true.ToString()),
MessageIsOperator));
}
else
{
context.ReportDiagnostic(Diagnostic.Create(Rule, invocation.GetLocation(),
ImmutableDictionary <string, string> .Empty
.Add(UseIsOperatorKey, false.ToString())
.Add(ShouldRemoveGetType, true.ToString()),
MessageIsInstanceOfType));
}
}
private static void CheckGetTypeAndTypeOfEquality(ExpressionSyntax sideA, ExpressionSyntax sideB, Location location,
SyntaxNodeAnalysisContext context)
{
if (!TypeExaminationOnSystemType.IsGetTypeCall(sideA as InvocationExpressionSyntax, context.SemanticModel))
{
return;
}
var typeSyntax = (sideB as TypeOfExpressionSyntax)?.Type;
if (typeSyntax == null)
{
return;
}
var typeSymbol = context.SemanticModel.GetTypeInfo(typeSyntax).Type;
if (typeSymbol == null ||
!typeSymbol.IsSealed ||
typeSymbol.OriginalDefinition.Is(KnownType.System_Nullable_T))
{
return;
}
context.ReportDiagnostic(Diagnostic.Create(Rule, location, MessageIsOperator));
}