static void ownerForm_Load(object sender, EventArgs e)
{
Form form = (Form)sender;
form.Left = -5000;
form.Top = -5000;
form.Hide();
DebugTrace.TraceInfo("UIThreadCaller is creating new WindowsFormsSynchronizationContext on the newly created MessageLoop thread.");
syncContext = new WindowsFormsSynchronizationContext();
hasOwnMessageLoop = true;
}
public static void Invoke(CallInUIThreadCallback action, params object[] additionalParams)
{
Form appFormWithMessageLoop = Application.OpenForms.Cast <Form>().FirstOrDefault(x => x != null && x.Owner == null);
if (appFormWithMessageLoop == null)
{
appFormWithMessageLoop = Application.OpenForms.Cast <Form>().FirstOrDefault(x => x != null);
}
if (appFormWithMessageLoop != null && (Application.MessageLoop || hasOwnMessageLoop))
{
if (appFormWithMessageLoop.InvokeRequired)
{
DebugTrace.TraceInfo("Making UIThreadCaller call on the thread of existing top level form.");
appFormWithMessageLoop.Invoke(action, appFormWithMessageLoop, additionalParams);
}
else
{
DebugTrace.TraceInfo("Making UIThreadCaller call on the current thread as the found top level form runs on the same thread as us.");
action.Invoke(appFormWithMessageLoop, additionalParams);
}
}
else if ((!Application.MessageLoop || appFormWithMessageLoop == null) && syncContext == null)
{
if (syncContext == null)
{
DebugTrace.TraceInfo("UIThreadCaller is creating a MessageLoop thread.");
ThreadPool.QueueUserWorkItem(RunAppThread);
while (syncContext == null)
{
Thread.Sleep(10);
}
}
if (syncContext != null)
{
DebugTrace.TraceInfo("Making UIThreadCaller call on an existing WindowsFormsSynchronizationContext.");
bool callFinished = false;
syncContext.Post(new SendOrPostCallback(delegate(object state)
{
action.Invoke(appFormWithMessageLoop != null && !appFormWithMessageLoop.InvokeRequired ? appFormWithMessageLoop : null, additionalParams);
callFinished = true;
}), null);
while (!callFinished)
{
Thread.Sleep(10);
}
}
else
{
DebugTrace.TraceInfo("Making UIThreadCaller call directly.");
action.Invoke(appFormWithMessageLoop != null && !appFormWithMessageLoop.InvokeRequired ? appFormWithMessageLoop : null, additionalParams);
}
}
else
{
if (syncContext == null)
{
DebugTrace.TraceInfo("UIThreadCaller is creating new WindowsFormsSynchronizationContext on the current thread.");
syncContext = new WindowsFormsSynchronizationContext();
}
if (syncContext != null)
{
DebugTrace.TraceInfo("Making UIThreadCaller call on an existing WindowsFormsSynchronizationContext.");
bool callFinished = false;
syncContext.Post(new SendOrPostCallback(delegate(object state)
{
action.Invoke(appFormWithMessageLoop != null && !appFormWithMessageLoop.InvokeRequired ? appFormWithMessageLoop : null, additionalParams);
callFinished = true;
}), null);
while (!callFinished)
{
Thread.Sleep(10);
}
}
else
{
DebugTrace.TraceInfo("Making UIThreadCaller call directly.");
action.Invoke(appFormWithMessageLoop != null && !appFormWithMessageLoop.InvokeRequired ? appFormWithMessageLoop : null, additionalParams);
}
}
}
