/// <summary>
/// Replaces the items in the fromList collection that
/// are present in the oldItems collection with the items
/// in the newItems collection.
/// </summary>
/// <param name="fromList">The list to have items replaced.</param>
/// <param name="oldItems">The items in the fromList to be replaced.</param>
/// <param name="newItems">The items to replace the oldItems collection.</param>
public static void ReplaceRange(
this IList fromList, IEnumerable oldItems, IEnumerable newItems)
{
AssertArg.IsNotNull(fromList, nameof(fromList));
AssertArg.IsNotNull(oldItems, nameof(oldItems));
AssertArg.IsNotNull(newItems, nameof(newItems));
IRangeOperations collection = fromList as IRangeOperations;
if (collection != null)
{
collection.ReplaceRange(oldItems, newItems);
return;
}
var suspendableList = fromList as ISuspendChangeNotification;
bool wasSuspended = false;
try
{
if (suspendableList != null)
{
wasSuspended = suspendableList.ChangeNotificationSuspended;
suspendableList.ChangeNotificationSuspended = true;
}
int startIndex = fromList.Count - 1;
foreach (var item in oldItems)
{
int index = fromList.IndexOf(item);
if (index < startIndex)
{
startIndex = index;
}
fromList.Remove(item);
}
if (startIndex < 0)
{
foreach (var item in newItems)
{
fromList.Add(item);
}
return;
}
int newIndex = startIndex;
foreach (var item in newItems)
{
fromList.Insert(newIndex, item);
newIndex++;
}
}
finally
{
if (suspendableList != null && !wasSuspended)
{
try
{
suspendableList.ChangeNotificationSuspended = false;
}
catch (Exception)
{
/* Suppress. */
}
}
}
}
