/// <summary>
/// Is this interface explicitly derives from IEnumerable (from mscorlib.tlb)?
/// </summary>
/// <param name="lookupPartner">Whether we look at the partner interface</param>
public static bool ExplicitlyImplementsIEnumerable(TypeInfo typeInfo, TypeAttr typeAttr, bool lookupPartner)
{
// Look through each of the implemented/inherited interfaces
for (int i = 0; i < typeAttr.cImplTypes; ++i)
{
TypeInfo interfaceTypeInfo = typeInfo.GetRefType(i);
using (TypeAttr interfaceTypeAttr = interfaceTypeInfo.GetTypeAttr())
{
if ((typeInfo.GetImplTypeFlags(i) & TypeLibTypes.Interop.IMPLTYPEFLAGS.IMPLTYPEFLAG_FSOURCE) == 0)
{
if (interfaceTypeAttr.Guid == WellKnownGuids.IID_IEnumerable)
return true;
if (ExplicitlyImplementsIEnumerable(interfaceTypeInfo, interfaceTypeAttr))
return true;
}
}
}
if (lookupPartner)
{
TypeInfo partnerTypeInfo = typeInfo.GetRefTypeNoComThrow();
if (partnerTypeInfo != null)
{
using (TypeAttr partnerTypeAttr = partnerTypeInfo.GetTypeAttr())
{
if (partnerTypeAttr.Guid == WellKnownGuids.IID_IEnumerable)
return true;
if (ExplicitlyImplementsIEnumerable(partnerTypeInfo, partnerTypeAttr, false))
return true;
}
}
}
return false;
}
public static int GetPointerSize(TypeInfo typeInfo)
{
using (TypeAttr attr = typeInfo.GetTypeAttr())
{
if (attr.Guid == WellKnownGuids.IID_IUnknown || attr.Guid == WellKnownGuids.IID_IDispatch)
{
return attr.cbSizeInstance;
}
if (attr.cImplTypes == 1)
{
TypeInfo parent = typeInfo.GetRefType(0);
return GetPointerSize(parent);
}
return attr.cbSizeInstance;
}
}
private static bool IsDerivedFromIIDInternal(TypeInfo typeInfo, Guid iid)
{
using (TypeAttr attr = typeInfo.GetTypeAttr())
{
if (attr.Guid == iid)
return true;
// If we've seen a IUnknown (note that if the iid is IUnknown, we've tested that already)),
// we've recused far enough
if (attr.Guid == WellKnownGuids.IID_IUnknown)
return false;
if (attr.cImplTypes == 1)
{
TypeInfo parent = typeInfo.GetRefType(0);
return IsDerivedFromIIDInternal(parent, iid);
}
}
return false;
}