public void CancellationWorks()
{
using (var f = new ProgressForm()) {
f.Show(); //Necessary to make Visible work
var cancelButton = (Button)f.Controls.Find("cancelButton", true)[0];
Assert.IsFalse(cancelButton.Visible);
f.AllowCancellation = true;
Assert.IsTrue(cancelButton.Visible);
Assert.IsFalse(f.WasCanceled);
cancelButton.PerformClick();
Assert.IsTrue(f.WasCanceled);
}
}
public static bool Execute(IWin32Window parent, Action<IProgressReporter> method)
{
if (method == null) throw new ArgumentNullException("method");
Exception exception = null;
bool canceled = false, finished = false;
using (var dialog = new ProgressForm()) {
dialog.Show(parent);
ThreadPool.QueueUserWorkItem(delegate {
try {
method(dialog);
} catch (Exception ex) {
exception = ex;
} finally {
canceled = dialog.WasCanceled;
finished = true;
dialog.BeginInvoke(new Action(dialog.Close));
}
});
if (!dialog.IsDisposed && !finished) {
dialog.Hide();
dialog.ShowDialog(parent); //Only show modally if the operation hasn't finished yet; this avoids a brief flicker for very quick operations
}
}
if (exception != null)
throw new TargetInvocationException(exception);
return !canceled;
}