private static void UiThreadStart()
{
// Keep the window in the foreground.
// Sometimes, when debugging in Visual Studio, the window sits in the background,
// unnoticed, and prevents the application to shut down because it's not a background
// thread. Setting TopMost again after a short while helps to bring it in the foreground
// again.
System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
timer.Tick += delegate(object sender, EventArgs args)
{
// Just to be sure, also set Visible, it doesn't hurt
currentInstance.Visible = true;
currentInstance.TopMost = true;
// Come back, but not so soon
timer.Interval *= 2;
};
timer.Interval = 100;
timer.Start();
Application.Run(currentInstance);
// The window has been closed and the message loop was left. Should there still be a
// timer event scheduled, it won't be executed anymore. Now clean up everything.
timer.Stop();
timer.Dispose();
lock (syncLock)
{
currentInstance.Dispose();
currentInstance = null;
}
}
/// <summary>
/// Shows the application error dialog. This is the only method that is called to show or
/// update an error dialog. If a dialog is already open, the error is added to it.
/// </summary>
/// <param name="canContinue">Indicates whether the application can continue.</param>
/// <param name="errorMsg">The error message to display.</param>
/// <param name="ex">The <see cref="Exception"/> instance to display as details object.</param>
/// <param name="terminateTimerEnabled">Indicates whether the termination safety timer has been started.</param>
public static void ShowError(bool canContinue, string errorMsg, object ex, bool terminateTimerEnabled)
{
lock (syncLock)
{
try
{
if (currentInstance == null)
{
currentInstance = new AppErrorDialog();
currentInstance.SetCanContinue(canContinue);
currentInstance.errorLabel.Text = errorMsg;
currentInstance.grid.SelectedObject = ex;
currentInstance.detailsLabel.Enabled = ex != null;
if (terminateTimerEnabled)
{
currentInstance.EnableTerminateTimer();
}
// Source: http://stackoverflow.com/a/3992635/143684
uiThread = new Thread(UiThreadStart);
uiThread.Name = "FieldLog.AppErrorDialogUIThread";
uiThread.SetApartmentState(ApartmentState.STA);
uiThread.Start();
}
else
{
// Add next error to existing dialog
// Wait until the window handle is created
int count = 0;
while (!currentInstance.IsHandleCreated)
{
if (count++ > 500)
{
throw new TimeoutException("Application error dialog was not created in reasonable time.");
}
Thread.Sleep(10);
}
currentInstance.Invoke(new AddErrorDelegate(currentInstance.AddError), canContinue, errorMsg, ex, terminateTimerEnabled);
}
}
catch (Exception ex2)
{
FL.Critical(ex2, "FieldLog.Showing AppErrorDialog", false);
FL.Flush();
MessageBox.Show(
"Error showing the application error dialog. Details should be logged.",
"Error",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
}
// Make sure we won't continue in this thread if it's not possible
while (!canContinue)
{
Thread.Sleep(1000000);
}
// Slow down or halt the application as long as there are many pending errors.
// The error dialog runs in its own thread so it will still respond to user input. :-)
// (Unless, of course, should an error occur in the error dialog…)
if (currentInstance != null && currentInstance.GetNextErrorsCount() >= 20)
{
Thread.Sleep(1000);
}
while (currentInstance != null && currentInstance.GetNextErrorsCount() >= 40)
{
Thread.Sleep(1000);
}
}
private static void UiThreadStart()
{
// Keep the window in the foreground.
// Sometimes, when debugging in Visual Studio, the window sits in the background,
// unnoticed, and prevents the application to shut down because it's not a background
// thread. Setting TopMost again after a short while helps to bring it in the foreground
// again.
System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
timer.Tick += delegate (object sender, EventArgs args)
{
// Just to be sure, also set Visible, it doesn't hurt
currentInstance.Visible = true;
currentInstance.TopMost = true;
// Come back, but not so soon
timer.Interval *= 2;
};
timer.Interval = 100;
timer.Start();
Application.Run(currentInstance);
// The window has been closed and the message loop was left. Should there still be a
// timer event scheduled, it won't be executed anymore. Now clean up everything.
timer.Stop();
timer.Dispose();
lock (syncLock)
{
currentInstance.Dispose();
currentInstance = null;
}
}
/// <summary>
/// Shows the application error dialog. This is the only method that is called to show or
/// update an error dialog. If a dialog is already open, the error is added to it.
/// </summary>
/// <param name="canContinue">Indicates whether the application can continue.</param>
/// <param name="errorMsg">The error message to display.</param>
/// <param name="ex">The <see cref="Exception"/> instance to display as details object.</param>
/// <param name="terminateTimerEnabled">Indicates whether the termination safety timer has been started.</param>
public static void ShowError(bool canContinue, string errorMsg, object ex, bool terminateTimerEnabled)
{
lock (syncLock)
{
try
{
if (currentInstance == null)
{
currentInstance = new AppErrorDialog();
currentInstance.SetCanContinue(canContinue);
currentInstance.errorLabel.Text = errorMsg;
currentInstance.grid.SelectedObject = ex;
currentInstance.detailsLabel.Enabled = ex != null;
if (terminateTimerEnabled)
{
currentInstance.EnableTerminateTimer();
}
// Source: http://stackoverflow.com/a/3992635/143684
uiThread = new Thread(UiThreadStart);
uiThread.Name = "FieldLog.AppErrorDialogUIThread";
uiThread.SetApartmentState(ApartmentState.STA);
uiThread.Start();
}
else
{
// Add next error to existing dialog
// Wait until the window handle is created
int count = 0;
while (!currentInstance.IsHandleCreated)
{
if (count++ > 500)
throw new TimeoutException("Application error dialog was not created in reasonable time.");
Thread.Sleep(10);
}
currentInstance.Invoke(new AddErrorDelegate(currentInstance.AddError), canContinue, errorMsg, ex, terminateTimerEnabled);
}
}
catch (Exception ex2)
{
FL.Critical(ex2, "FieldLog.Showing AppErrorDialog", false);
FL.Flush();
MessageBox.Show(
"Error showing the application error dialog. Details should be logged.",
"Error",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
}
// Make sure we won't continue in this thread if it's not possible
while (!canContinue)
{
Thread.Sleep(1000000);
}
// Slow down or halt the application as long as there are many pending errors.
// The error dialog runs in its own thread so it will still respond to user input. :-)
// (Unless, of course, should an error occur in the error dialog…)
if (currentInstance != null && currentInstance.GetNextErrorsCount() >= 20)
{
Thread.Sleep(1000);
}
while (currentInstance != null && currentInstance.GetNextErrorsCount() >= 40)
{
Thread.Sleep(1000);
}
}