Microsoft .NET Framework 4.5 Quickstart Cookbook

Throttling data source update delays

With WPF 4.5, we can now control how the data source that is bound to a part of the UI, gets updated. The best example here is a slider bound to a value, which, for example, has to perform a calculation. With WPF 4.0, the property setter was called for every changed event that was launched by the binding in place and, if we didn't do anything to prevent the excessive calculations, we could end with a responsiveness problem. This could be even worse if some calculation was being performed in response, such as updating the total price.

Now, this doesn't happen, as we can control the delay after the property stops changing, before updating the source. This means that we can change a UI element and we can control ...