private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
IQueryable <World> query = null;
Table <World> table;
if (worldTable == null)
{
table = worldworkspace.WorldTable;
}
else
{
table = worldTable;
}
switch (comboBox1.Text)
{
case "Select all where Continent is equal to North America":
query = this.GetContinentsForNorthAmerica(table);
break;
case "Select all where Pop_1994 is greater then 4,000,000":
query = this.GetGreaterThenFilter(table, 4000000);
break;
}
QueryTextbox.Clear();
if (query != null)
{
QueryTextbox.Text = query.ToQueryString();
}
}
public Task <WallpaperSource> WaitForButtonPressAsync()
{
Dispatcher.BeginInvoke(new Action(() =>
{
this.Focus();
QueryTextbox.Focus();
}));
var tcs = new TaskCompletionSource <WallpaperSource>();
RoutedEventHandler negativeHandler = null;
KeyEventHandler negativeKeyHandler = null;
RoutedEventHandler affirmativeHandler = null;
KeyEventHandler affirmativeKeyHandler = null;
KeyEventHandler escapeKeyHandler = null;
Action cleanUpHandlers = null;
cleanUpHandlers = () =>
{
QueryTextbox.KeyDown -= affirmativeKeyHandler;
this.KeyDown -= escapeKeyHandler;
NegativeButton.Click -= negativeHandler;
AffirmativeButton.Click -= affirmativeHandler;
NegativeButton.KeyDown -= negativeKeyHandler;
AffirmativeButton.KeyDown -= affirmativeKeyHandler;
};
escapeKeyHandler = (sender, e) =>
{
if (e.Key != Key.Escape)
{
return;
}
cleanUpHandlers();
tcs.TrySetResult(null);
};
negativeKeyHandler = (sender, e) =>
{
if (e.Key != Key.Enter)
{
return;
}
cleanUpHandlers();
tcs.TrySetResult(null);
};
affirmativeKeyHandler = (sender, e) =>
{
if (e.Key != Key.Enter)
{
return;
}
cleanUpHandlers();
tcs.TrySetResult(GetResult());
};
negativeHandler = (sender, e) =>
{
cleanUpHandlers();
tcs.TrySetResult(null);
e.Handled = true;
};
affirmativeHandler = (sender, e) =>
{
cleanUpHandlers();
tcs.TrySetResult(GetResult());
e.Handled = true;
};
NegativeButton.KeyDown += negativeKeyHandler;
AffirmativeButton.KeyDown += affirmativeKeyHandler;
QueryTextbox.KeyDown += affirmativeKeyHandler;
this.KeyDown += escapeKeyHandler;
NegativeButton.Click += negativeHandler;
AffirmativeButton.Click += affirmativeHandler;
return(tcs.Task);
}
