// Returns the IEnumerable interface implemented by the given type,
// preferring System.Collections.Generic.IEnumerable<T> over
// System.Collections.IEnumerable. If there are multiple implementations
// of IEnumerable<T> on base and derived types, the implementation on
// the most derived type is returned. If there are multiple implementations
// of IEnumerable<T> on the same type, it is undefined which is returned.
internal static Type GetIEnumerableImplementationIfAny(this Type type)
{
var t = type;
do
{
foreach (var @interface in t.GetInterfacesOnType())
{
if (@interface.IsIEnumerableOfT())
{
// Return the first implementation of IEnumerable<T>.
return(@interface);
}
}
t = t.BaseType;
} while (t != null);
foreach (var @interface in type.GetInterfaces())
{
if (@interface.IsIEnumerable())
{
return(@interface);
}
}
return(null);
}
// Returns the IEnumerable interface implemented by the given type,
// preferring System.Collections.Generic.IEnumerable<T> over
// System.Collections.IEnumerable. If there are multiple implementations
// of IEnumerable<T> on base and derived types, the implementation on
// the most derived type is returned. If there are multiple implementations
// of IEnumerable<T> on the same type, it is undefined which is returned.
internal static Type GetIEnumerableImplementationIfAny(this Type type)
{
var t = type;
do
{
foreach (var @interface in t.GetInterfacesOnType())
{
if (@interface.IsMscorlibType("System.Collections.Generic", "IEnumerable`1"))
{
// Return the first implementation of IEnumerable<T>.
return(@interface);
}
}
t = t.BaseType;
} while (t != null);
foreach (var @interface in type.GetInterfaces())
{
if (@interface.IsMscorlibType("System.Collections", "IEnumerable"))
{
return(@interface);
}
}
return(null);
}
internal static bool IsIDynamicMetaObjectProvider(this Type type)
{
foreach (var @interface in type.GetInterfaces())
{
if (@interface.IsType("System.Dynamic", "IDynamicMetaObjectProvider"))
{
return(true);
}
}
return(false);
}
private static Type GetAncestorType(Type type, string ancestorTypeName)
{
if (type.FullName == ancestorTypeName)
{
return(type);
}
// Search interfaces.
foreach (var @interface in type.GetInterfaces())
{
var ancestorType = GetAncestorType(@interface, ancestorTypeName);
if (ancestorType != null)
{
return(ancestorType);
}
}
// Search base type.
var baseType = type.BaseType;
if (baseType != null)
{
return(GetAncestorType(baseType, ancestorTypeName));
}
return(null);
}
private static Type GetAncestorType(Type type, string ancestorTypeName)
{
if (type.FullName == ancestorTypeName)
{
return type;
}
// Search interfaces.
foreach (var @interface in type.GetInterfaces())
{
var ancestorType = GetAncestorType(@interface, ancestorTypeName);
if (ancestorType != null)
{
return ancestorType;
}
}
// Search base type.
var baseType = type.BaseType;
if (baseType != null)
{
return GetAncestorType(baseType, ancestorTypeName);
}
return null;
}
