/// <summary>
/// Return the enumerable as a List of T, copying if required. Optimized for common case where it is an List of T
/// or a ListWrapperCollection of T. Avoid mutating the return value.
/// </summary>
public static List <T> AsList <T>(this IEnumerable <T> target)
{
Contract.Assert(target != null);
List <T> list = target as List <T>;
if (list != null)
{
return(list);
}
ListWrapperCollection <T> listWrapper = target as ListWrapperCollection <T>;
if (listWrapper != null)
{
return(listWrapper.ItemsList);
}
return(new List <T>(target));
}
/// <summary>
/// Return the enumerable as a List of T, copying if required. Optimized for common case where it is an List of T
/// or a ListWrapperCollection of T. Avoid mutating the return value.
/// </summary>
public static List <T> AsList <T>(this IEnumerable <T> enumerable)
{
Contract.Assert(enumerable != null);
List <T> list = enumerable as List <T>;
if (list != null)
{
return(list);
}
ListWrapperCollection <T> listWrapper = enumerable as ListWrapperCollection <T>;
if (listWrapper != null)
{
return(listWrapper.ItemsList);
}
return(new List <T>(enumerable));
}