private void InitializeFirstOrLast(ArrayChengedAction action, T changedItems)
{
if (action == ArrayChengedAction.First)
{
InitializeFirst(action, changedItems);
}
else
{
InitializeLast(action, changedItems);
}
}
private void InitializeAddOrRemove(ArrayChengedAction action, T changedItems)
{
if (action == ArrayChengedAction.Add)
{
InitializeAdd(action, changedItems);
}
else
{
InitializeRemove(action, changedItems);
}
}
public ArrayChangedEvent(ArrayChengedAction action)
{
try
{
if (action != ArrayChengedAction.Add && action != ArrayChengedAction.Remove &&
action != ArrayChengedAction.Clear && action != ArrayChengedAction.First &&
action != ArrayChengedAction.Last)
{
throw new ArgumentException();
}
}
catch (ArgumentException e)
{
Console.WriteLine($"Error: {e.Message}");
}
}
public ArrayChangedEvent(ArrayChengedAction action, T changedItem)
{
try
{
if (action != ArrayChengedAction.Add && action != ArrayChengedAction.Remove &&
action != ArrayChengedAction.Clear && action != ArrayChengedAction.First &&
action != ArrayChengedAction.Last)
{
throw new ArgumentException();
}
if (action == ArrayChengedAction.Clear)
{
if (changedItem != null)
{
throw new ArgumentException();
}
InitializeAdd(action, default(T));
}
else
{
if (action == ArrayChengedAction.First || action == ArrayChengedAction.Last)
{
InitializeFirstOrLast(action, changedItem);
}
else
{
InitializeAddOrRemove(action, changedItem);
}
}
}
catch (ArgumentException e)
{
Console.WriteLine($"Error: {e.Message}");
}
}
private void InitializeLast(ArrayChengedAction action, T Item)
{
_action = action;
data = Item;
}
private void InitializeRemove(ArrayChengedAction action, T newItems)
{
_action = action;
data = newItems;
}
