/// <summary>
/// Raises the DoWork event.
/// </summary>
/// <param name="e">A <see cref="QueuedWorkerDoWorkEventArgs"/> that contains event data.</param>
protected virtual void OnDoWork(QueuedWorkerDoWorkEventArgs e)
{
if (DoWork != null)
{
DoWork(this, e);
}
}
/// <summary>
/// Used by the worker thread to process items.
/// </summary>
private void Run()
{
while (!Stopping)
{
lock (_lockObject)
{
// Wait until we have pending work items
if (IsWorkQueueEmpty())
{
Monitor.Wait(_lockObject);
}
}
// Loop until we exhaust the queue
var queueFull = true;
while (queueFull && !Stopping)
{
// Get an item from the queue
AsyncOperation asyncOp = null;
object request = null;
var priority = 0;
lock (_lockObject)
{
// Check queues
var work = GetWork();
asyncOp = work.Item1;
priority = work.Item2;
if (asyncOp != null)
{
request = asyncOp.UserSuppliedState;
}
// Check if the item was removed
if (request != null && _cancelledItems.ContainsKey(request))
{
request = null;
}
}
if (request != null)
{
Exception error = null;
// Start the work
var arg = new QueuedWorkerDoWorkEventArgs(request, priority);
try
{
// Raise the do work event
OnDoWork(arg);
}
catch (Exception e)
{
error = e;
}
// Raise the work complete event
var arg2 = new QueuedWorkerCompletedEventArgs(request,
arg.Result, priority, error, arg.Cancel);
if (!Stopping)
{
asyncOp.PostOperationCompleted(_workCompletedCallback, arg2);
}
}
else if (asyncOp != null)
{
asyncOp.OperationCompleted();
}
// Check if the cache is exhausted
lock (_lockObject)
{
queueFull = !IsWorkQueueEmpty();
}
}
}
}
