public static void InsertRange <T>(IList <T> collection, int index, IEnumerable <T> items)
{
ContractUtils.RequiresNotNull(collection, nameof(collection));
ContractUtils.RequiresNotNull(items, nameof(items));
ContractUtils.RequiresArrayInsertIndex(collection, index, nameof(index));
if (collection is List <T> list)
{
list.InsertRange(index, items);
}
else
{
int i = index;
foreach (T obj in items)
{
collection.Insert(i++, obj);
}
}
}
public static void InsertRange <T>(IList <T> collection, int index, IEnumerable <T> items)
{
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresNotNull(items, "items");
ContractUtils.RequiresArrayInsertIndex(collection, index, "index");
List <T> list = collection as List <T>;
if (list != null)
{
list.InsertRange(index, items);
}
else
{
int i = index;
foreach (T obj in items)
{
collection.Insert(i++, obj);
}
}
}