/// <summary>
/// Saves the specified item in the list.
/// </summary>
/// <param name="index">Index of item to be saved.</param>
/// <param name="delete">true if the item should be deleted.</param>
protected virtual async Task SaveItemAsync(int index, bool delete)
{
T item = this[index];
var handleBusy = false;
if ((item.IsDeleted || delete) || (item.IsValid && item.IsDirty))
{
T savable = item;
// attempt to clone object
ICloneable cloneable = savable as ICloneable;
if (cloneable != null)
{
savable = (T)cloneable.Clone();
MethodCaller.CallMethodIfImplemented(item, "MarkBusy");
handleBusy = true;
}
// commit all changes
int editLevel = savable.EditLevel;
for (int tmp = 1; tmp <= editLevel; tmp++)
{
savable.AcceptChanges(editLevel - tmp, false);
}
if (delete)
{
savable.Delete();
}
Exception error = null;
T result = default(T);
var dp = ApplicationContext.CreateInstance <DataPortal <T> >();
try
{
result = await dp.UpdateAsync((T)savable);
}
catch (AggregateException ex)
{
if (ex.InnerExceptions.Count > 0)
{
error = ex.InnerExceptions[0];
}
else
{
error = ex;
}
}
catch (Exception ex)
{
error = ex;
}
finally
{
if (handleBusy)
{
MethodCaller.CallMethodIfImplemented(item, "MarkIdle");
}
}
// update index - this may have changed under the duration of async call
index = IndexOf(item);
if (error == null && result != null)
{
if (savable.IsDeleted)
{
//SafeRemoveItem will raise INotifyCollectionChanged event
SafeRemoveItem(index);
}
else
{
for (int tmp = 1; tmp <= editLevel; tmp++)
{
result.CopyState(tmp, false);
}
SafeSetItem(index, result);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, index));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, this[index], index));
}
item.SaveComplete(result);
OnSaved(result, null);
}
else
{
item.SaveComplete(item);
OnSaved(item, error);
}
}
}
/// <summary>
/// Saves the specified item in the list.
/// </summary>
/// <param name="index">
/// Index of the item to be saved.
/// </param>
/// <remarks>
/// This method properly saves the child item,
/// by making sure the item in the collection
/// is properly replaced by the result of the
/// Save() method call.
/// </remarks>
public virtual void SaveItem(int index)
{
T item = this[index];
var handleBusy = false;
if (item.IsDeleted || (item.IsValid && item.IsDirty))
{
T savable = item;
// attempt to clone object
ICloneable cloneable = savable as ICloneable;
if (cloneable != null)
{
savable = (T)cloneable.Clone();
MethodCaller.CallMethodIfImplemented(item, "MarkBusy");
handleBusy = true;
}
// commit all changes
int editLevel = savable.EditLevel;
for (int tmp = 1; tmp <= editLevel; tmp++)
{
savable.AcceptChanges(editLevel - tmp, false);
}
// save object
DataPortal <T> dp = new DataPortal <T>();
dp.UpdateCompleted += (o, e) =>
{
if (handleBusy)
{
MethodCaller.CallMethodIfImplemented(item, "MarkIdle");
}
if (e.Error == null)
{
T result = e.Object;
if (item.IsDeleted)
{
//SafeRemoveItem will raise INotifyCollectionChanged event
SafeRemoveItem(index);
}
else
{
for (int tmp = 1; tmp <= editLevel; tmp++)
{
result.CopyState(tmp, false);
}
SafeSetItem(index, result);
#if SILVERLIGHT
//Because SL Data Grid does not support replace action.
// we have to artificially raise remove/insert events
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, index));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, this[index], index));
#else
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, result, item));
#endif
}
#if SILVERLIGHT
item.SaveComplete(result, null, null);
#else
item.SaveComplete(result);
#endif
OnSaved(result, null);
}
else
{
#if SILVERLIGHT
item.SaveComplete(item, e.Error, null);
#else
item.SaveComplete(item);
#endif
OnSaved(item, e.Error);
}
};
dp.BeginUpdate(savable);
}
}
