/// <summary>
/// Determines whether the specified type reference implements directly or indirectly a requested marker interface.
/// </summary>
/// <param name="typeReference">The type reference.</param>
/// <param name="markerInterface">The aspect marker interface.</param>
/// <returns></returns>
private bool IsMarker(ITypeDefOrRef typeReference, ITypeDefOrRef markerInterface)
{
if (typeReference is null)
{
return(false);
}
lock (_isMarker)
{
var key = Tuple.Create(typeReference.FullName, markerInterface.FullName);
// there is a cache, because the same attribute may be found several time
// and we’re in a hurry, the developer is waiting for his program to start!
if (_isMarker.TryGetValue(key, out var isMarker))
{
return(isMarker);
}
// otherwise look for type or implemented interfaces (recursively)
var typeDef = ResolveTypeOrGenericDefinition(typeReference);
if (typeDef is null)
{
return(false);
}
var interfaces = typeDef.Interfaces;
_isMarker[key] = isMarker = typeReference.SafeEquivalent(markerInterface) ||
interfaces.Any(i => IsMarker(i.Interface, markerInterface)) ||
IsMarker(typeDef.BaseType, markerInterface);
return(isMarker);
}
}
