/// <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. */
}
}
}
}
/// <summary>
/// Adds the items from one set of items to the specified list.
/// </summary>
/// <typeparam name="T">The item type.</typeparam>
/// <param name="toList">The destination list.</param>
/// <param name="fromList">The source list.</param>
public static void AddRange <T>(
this IList <T> toList, IEnumerable <T> fromList)
{
AssertArg.IsNotNull(toList, nameof(toList));
AssertArg.IsNotNull(fromList, nameof(fromList));
IRangeOperations collection = toList as IRangeOperations;
if (collection != null)
{
collection.AddRange(fromList);
return;
}
var suspendableList = toList as ISuspendChangeNotification;
bool wasSuspended = false;
try
{
if (suspendableList != null)
{
wasSuspended = suspendableList.ChangeNotificationSuspended;
suspendableList.ChangeNotificationSuspended = true;
}
foreach (var item in fromList)
{
toList.Add(item);
}
}
finally
{
if (suspendableList != null && !wasSuspended)
{
try
{
suspendableList.ChangeNotificationSuspended = false;
}
catch (Exception)
{
/* Suppress. */
}
}
}
}
/// <summary>
/// Removes the specified items from the specified list.
/// </summary>
/// <param name="fromList">The list from which items will be removed.</param>
/// <param name="removeItems">The list of items to remove.</param>
public static void RemoveRange(
this IList fromList, IEnumerable removeItems)
{
AssertArg.IsNotNull(fromList, nameof(fromList));
AssertArg.IsNotNull(removeItems, nameof(removeItems));
IRangeOperations collection = fromList as IRangeOperations;
if (collection != null)
{
collection.RemoveRange(removeItems);
return;
}
var suspendableList = fromList as ISuspendChangeNotification;
bool wasSuspended = false;
try
{
if (suspendableList != null)
{
wasSuspended = suspendableList.ChangeNotificationSuspended;
suspendableList.ChangeNotificationSuspended = true;
}
foreach (var item in removeItems)
{
fromList.Remove(item);
}
}
finally
{
if (suspendableList != null && !wasSuspended)
{
try
{
suspendableList.ChangeNotificationSuspended = false;
}
catch (Exception)
{
/* Suppress. */
}
}
}
}
/// <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. */
}
}
}
}
