/// <summary>
/// Inserts items from the specified fromList collection
/// at the specified location in the toList collection.
/// </summary>
/// <param name="toList"></param>
/// <param name="fromList"></param>
/// <param name="startIndex"></param>
public static void InsertRange(
this IList toList, IEnumerable fromList, int startIndex)
{
AssertArg.IsNotNull(toList, nameof(toList));
AssertArg.IsNotNull(fromList, nameof(fromList));
AssertArg.IsGreaterThanOrEqual(0, startIndex, nameof(startIndex));
IRangeOperations collection = toList as IRangeOperations;
if (collection != null)
{
collection.InsertRange(fromList, startIndex);
return;
}
var suspendableList = toList as ISuspendChangeNotification;
bool wasSuspended = false;
try
{
if (suspendableList != null)
{
wasSuspended = suspendableList.ChangeNotificationSuspended;
suspendableList.ChangeNotificationSuspended = true;
}
int newIndex = startIndex;
foreach (var item in fromList)
{
toList.Insert(newIndex, item);
newIndex++;
}
}
finally
{
if (suspendableList != null && !wasSuspended)
{
try
{
suspendableList.ChangeNotificationSuspended = false;
}
catch (Exception)
{
/* Suppress. */
}
}
}
}
