///<summary>Executes a cancellable asynchronous operation and displays its progress.</summary>
///<param name="parent">The form that will own the progress display. This parameter can be null.</param>
///<param name="method">The method to execute. This should not do any immediate blocking work.</param>
///<returns>False if the cancel button was clicked.</returns>
public static async Task ExecuteAsync(IWin32Window parent, Func <IProgressReporter, CancellationToken, Task> method)
{
if (method == null)
{
throw new ArgumentNullException("method");
}
using (var dialog = new ProgressForm()
{
CanCancel = true
}) {
dialog.FadeIn();
try {
var task = method(dialog, dialog.CancellationSource.Token);
await Task.WhenAny(task, Task.Delay(5)); // If it finishes quickly, don't bother showing the dialog.
if (task.IsCompleted)
{
return;
}
SynchronizationContext.Current.Post(_ => dialog.ShowDialog(parent), null);
await task;
} finally {
dialog.Finished = true;
dialog.FadeOut();
}
if (dialog.WasCanceled)
{
throw new TaskCanceledException();
}
}
}
public static bool Execute(IWin32Window parent, Action<IProgressReporter> method, bool cancellable) {
if (method == null) throw new ArgumentNullException("method");
Exception exception = null;
bool canceled = false;
using (var dialog = new ProgressForm() { CanCancel = cancellable }) {
dialog.FadeIn();
ThreadPool.QueueUserWorkItem(delegate {
try {
method(dialog);
} catch (Exception ex) {
exception = ex;
} finally {
dialog.Finished = true;
dialog.FadeOut();
}
canceled = dialog.WasCanceled;
});
if (!dialog.IsDisposed && !dialog.Finished)
dialog.ShowDialog(parent);
}
if (exception != null)
throw new TargetInvocationException(exception);
return !canceled;
}
///<summary>Executes a cancellable asynchronous operation and displays its progress.</summary>
///<param name="parent">The form that will own the progress display. This parameter can be null.</param>
///<param name="method">The method to execute. This should not do any immediate blocking work.</param>
///<returns>False if the cancel button was clicked.</returns>
public static async Task ExecuteAsync(IWin32Window parent, Func<IProgressReporter, CancellationToken, Task> method) {
if (method == null) throw new ArgumentNullException("method");
using (var dialog = new ProgressForm() { CanCancel = true }) {
dialog.FadeIn();
try {
var task = method(dialog, dialog.CancellationSource.Token);
await Task.WhenAny(task, Task.Delay(5)); // If it finishes quickly, don't bother showing the dialog.
if (task.IsCompleted)
return;
SynchronizationContext.Current.Post(_ => dialog.ShowDialog(parent), null);
await task;
} finally {
dialog.Finished = true;
dialog.FadeOut();
}
if (dialog.WasCanceled)
throw new TaskCanceledException();
}
}
public static bool Execute(IWin32Window parent, Action <IProgressReporter> method, bool cancellable)
{
if (method == null)
{
throw new ArgumentNullException("method");
}
Exception exception = null;
bool canceled = false;
using (var dialog = new ProgressForm()
{
CanCancel = cancellable
}) {
dialog.FadeIn();
ThreadPool.QueueUserWorkItem(delegate {
try {
method(dialog);
} catch (Exception ex) {
exception = ex;
} finally {
dialog.Finished = true;
dialog.FadeOut();
}
canceled = dialog.WasCanceled;
});
if (!dialog.IsDisposed && !dialog.Finished)
{
dialog.ShowDialog(parent);
}
}
if (exception != null)
{
throw new TargetInvocationException(exception);
}
return(!canceled);
}
