How to Programmatically show a WPF/C# Windows.Control.ToolTip?

Question

There doesn't seem to be a .Show() kind of method for the Windows.Control.ToolTip, incl in ToolTipService.

Answer 1

What you need to do is make sure the ToolTip on the control is of type ToolTip. Then you can set the IsOpen property to true like so:

ToolTip tooltip = new ToolTip{ Content = "My Tooltip" }; NameTextBox.ToolTip = tooltip; tooltip.IsOpen = true;     

Answer 2

If you would like to control how long the tooltip remains open, you can subscribe to the Opened event and set a time delay before closing the tooltip.

Subscription has to be done before IsOpen = true and it has to be an async method to avoid hanging up the UI.

var tooltip = new ToolTip { Content = "New tooltip text" }; MyControln.ToolTip = tooltip; tooltip.Opened += async delegate (object o, RoutedEventArgs args) {     var s = o as ToolTip;     // let the tooltip display for 1 second     await Task.Delay(1000);     s.IsOpen = false;     // wait till the close tooltip animation finishes before changing to old tooltip text     await Task.Delay(1000);     s.Content = "Old tooltip text"; }; tooltip.IsOpen = true;