/// <summary>
/// Refreshes the data in the collection. The refresh method is invoked and
/// this method will replace all the data in the collection with the data coming
/// back from the refresh method.
/// </summary>
/// <returns>Awaitable task</returns>
public async Task RefreshAsync(bool appendData = false)
{
object refreshParameter = null;
Exception caughtException = null;
isRefreshing = true;
try
{
if (BeforeRefresh != null)
{
refreshParameter = BeforeRefresh.Invoke(this);
}
var results = await refreshDataFunc();
if (results != null)
{
this.Clear();
foreach (var item in results)
{
this.Add(item);
}
}
}
catch (Exception ex)
{
caughtException = ex;
}
if (caughtException != null)
{
if (RefreshFailed != null)
{
await RefreshFailed.Invoke(this, caughtException);
}
}
else if (AfterRefresh != null)
{
AfterRefresh.Invoke(this, refreshParameter);
}
// Done refresh the world.
isRefreshing = false;
OnCollectionChanged(
new NotifyCollectionChangedEventArgs(
NotifyCollectionChangedAction.Reset));
}
/// <summary>
/// Refreshes the data in the collection. The refresh method is invoked and
/// this method will replace all the data in the collection with the data coming
/// back from the refresh method.
/// </summary>
/// <returns>Awaitable task</returns>
public async Task RefreshAsync()
{
object refreshParameter = null;
IsRefreshing = true;
try
{
if (BeforeRefresh != null)
{
refreshParameter = BeforeRefresh.Invoke(this);
}
var results = await refreshDataFunc();
if (results != null)
{
using (base.BeginMassUpdate())
{
if (Merge == null) // replace the entire collection
{
base.Clear();
foreach (var item in results)
{
base.Add(item);
}
}
else
{
Merge.Invoke(this, results);
}
}
}
}
catch (Exception ex)
{
if (RefreshFailed != null)
{
await RefreshFailed.Invoke(this, ex);
}
}
finally
{
IsRefreshing = false;
AfterRefresh?.Invoke(this, refreshParameter);
}
}
