public static bool IsException(
ITypeSymbol typeSymbol,
SemanticModel semanticModel)
{
if (typeSymbol == null)
{
throw new ArgumentNullException(nameof(typeSymbol));
}
if (semanticModel == null)
{
throw new ArgumentNullException(nameof(semanticModel));
}
if (typeSymbol.IsClass())
{
INamedTypeSymbol exceptionSymbol = semanticModel.Compilation.GetTypeByMetadataName("System.Exception");
return(typeSymbol
.BaseTypesAndSelf()
.Any(f => f.Equals(exceptionSymbol)));
}
return(false);
}
// TODO: cater for generics, including in/out - test what CA2016 does in .NET 6
// after upgrading to Microsoft.CodeAnalysis.CSharp.Workspaces 3.x or later, we can convert this method to this single expression
// see https://github.com/dotnet/roslyn-analyzers/blob/8236e8bdf092bd9ae21cf42d12b8c480459b5e36/src/Utilities/Compiler/Extensions/ITypeSymbolExtensions.cs#L15-L21
// => fromSymbol != null && toSymbol != null && compilation.ClassifyCommonConversion(fromSymbol, toSymbol).IsImplicit;
public static bool IsAssignableTo(
this ITypeSymbol fromSymbol,
ITypeSymbol toSymbol)
=> fromSymbol != null && toSymbol != null && fromSymbol.AllInterfaces.Concat(fromSymbol.BaseTypesAndSelf()).Any(candidate => candidate.Equals(toSymbol));