It has a public property named Current, which returns a random number. When the value changes, the Property Changed event is raised so that the binding system will attempt to push that new value into a Text Block in the UI.
The Text Block’s Text property is bound to the Current property on the Random Number Engine, and that binding is where we use the Update Threshold Converter to govern how often the data is pushed.
This synchronisation is done immediately : each change of the target value, even a tiny tiny one update the source.
Let’s say that we a have a list of person and the selected one’s details are displayed.
We will then have an interface which looks like this : On each change of the Selected Person, a time-consuming process is triggered on the UI thread in the setter. Sleep : When the delay is not set, navigation in the list is just slow and freeze the UI on each changes.
He asked if it is possible to control how frequently a binding target is updated.
Suppose that you have a data source where a property’s value changes very rapidly, perhaps several dozen times per second.
Download the demo project here: Update Threshold Converter (demo project) Be sure to change the file extension from .
This is more precise and understandable to me to say that a ‘Delay’ property has been added to the Binding markup extension !Just letting the ‘arrow down’ key makes the UI freeze too much for me.With the delay property set to a value of 500 milliseconds, I can easily navigate in the list with the keyboard.Here is the XAML for the demo app’s main Window contents: Here is the entire Update Threshold Converter class: The Update Threshold property represents the number of milliseconds which must elapse between successful attempts to push a new value from the binding source to target.Returning from the Convert method informs the binding system that no values should be updated, leaving the attempt to transfer data as a no-op. A binding is done between two objects : the source (where the data comes from) and the target (where the data go to).