private void AsyncGatherItems(object workItem)
{
object[] parameters = ( object[] )workItem;
AsyncQueryInfo queryInfo = parameters[0] as AsyncQueryInfo;
if (queryInfo.ShouldAbort)
{
return;
}
IQueryable queryable = ( IQueryable )parameters[1];
object[] items = new object[queryInfo.RequestedItemCount];
System.Collections.IEnumerator enumerator;
lock ( m_syncRoot )
{
// We reverify here since a reset could have been issued while we were waiting on the lock statement.
if ((queryInfo.ShouldAbort) || (!this.IsConnected) || (this.IsDisposed))
{
return;
}
try
{
Debug.WriteLineIf(VirtualPageManager.DebugDataVirtualization, "Beginning Provider Execute for page at start index: " + queryInfo.StartIndex.ToString());
enumerator = queryable.GetEnumerator();
Debug.WriteLineIf(VirtualPageManager.DebugDataVirtualization, "Ended Provider Execute for page at start index: " + queryInfo.StartIndex.ToString());
int i = 0;
while (enumerator.MoveNext())
{
object current = enumerator.Current;
if (current != null)
{
items[i] = enumerator.Current;
}
i++;
}
}
catch (Exception exception)
{
// TimeOut exeception or other.
queryInfo.AbortQuery();
queryInfo.Error = exception.Message;
return;
}
}
bool queryableWasReversed = ( bool )parameters[2];
if (queryableWasReversed)
{
Array.Reverse(items);
}
queryInfo.EndQuery(items);
}
private void AsyncGatherItems(object workItem)
{
object[] parameters = ( object[] )workItem;
AsyncQueryInfo queryInfo = parameters[0] as AsyncQueryInfo;
if (queryInfo.ShouldAbort)
{
return;
}
IQueryable queryable = ( IQueryable )parameters[1];
int requestedItemCount = queryInfo.RequestedItemCount;
object[] items = new object[requestedItemCount];
System.Collections.IEnumerator enumerator;
lock ( m_syncRoot )
{
// We reverify here since a reset could have been issued while we were waiting on the lock statement.
if ((queryInfo.ShouldAbort) || (!this.IsConnected) || (this.IsDisposed))
{
return;
}
try
{
Debug.WriteLineIf(VirtualPageManager.DebugDataVirtualization, "Beginning Provider Execute for page at start index: " + queryInfo.StartIndex.ToString());
enumerator = queryable.GetEnumerator();
Debug.WriteLineIf(VirtualPageManager.DebugDataVirtualization, "Ended Provider Execute for page at start index: " + queryInfo.StartIndex.ToString());
int i = 0;
while (enumerator.MoveNext() && (i < requestedItemCount))
{
object current = enumerator.Current;
if (current != null)
{
items[i] = enumerator.Current;
i++;
}
}
}
catch (Exception exception)
{
// TimeOut exeception or other.
queryInfo.AbortQuery();
queryInfo.Error = exception.Message;
return;
}
}
items = items.Where(item => item != null).ToArray();
try
{
if (items.Count() != requestedItemCount)
{
throw new InvalidOperationException("The number of non-null items returned by the source must be equal to the provided item count.");
}
}
catch
{
//go silently here, in case the next sequance give a valid result. At the same time, if it does not, the dev has information when debugging.
}
bool queryableWasReversed = ( bool )parameters[2];
if (queryableWasReversed)
{
Array.Reverse(items);
}
queryInfo.EndQuery(items);
}
