Wpf ivalueconverter.convert parameter

Below is the implementation of the IValueConvertor class for the scenario I have discusses in the above example. Convert method is called while binding the value from the VIew-Model to the View of the class. To use this converter we have include it in the resource dictionary as shown below.

In the above figure I have created a entry in the resource dictionary by providing a Key named valueConverter. There are some cases where we want to pass an extra argument to the Convert function of the IValueConverter implementation in that case we can use the ConverterParameter property of the Binding class as shown below.

As you can easily make out from the code that if the property IsEntryForm is true in that case we have to make the control visible otherwise it will depend on the Value of Occupation property. This method is used for converting back the views values to the appropriate property value for View Model.

Though I have not implemented the method in my example but in case of two way bindings there are chances that we have to traverse back the value to View model in that case we have to appropriately implement this method.

This site uses Akismet to reduce spam. Improve this answer. Alan Baljeu 2, 4 4 gold badges 21 21 silver badges 36 36 bronze badges. Matas Matas 8 8 silver badges 16 16 bronze badges. Not true, because the ConverterParameter property of a Binding is not a dependency property, and hence can't be bound.

See here: stackoverflow. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. If you are using the converter in situations where the binding can use fallbacks or otherwise show reasonable results even if a conversion failure occurs, consider having your converter return DependencyProperty.

UnsetValue and not throw exceptions. UnsetValue is a sentinel value that has special meaning in the dependency property system, and bindings that are passed this value will use FallbackValue. Another alternative to throwing exceptions is to return the original value unchanged, and let the binding instance handle what it might do with that value.

In most cases UI bindings that fail won't be error cases. They just won't use the source value and will instead use DependencyProperty. UnsetValue to show nothing, or use fallbacks. For an example that shows how to implement the Convert method using the parameter and language parameters, see the IValueConverter interface. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.