Ivalueconverter converterparameter xaml

On many occasions another source of information is needed for the converter in order to 'do its job', this source is called ' ConverterParameter ' and it's one of the converter's Convert and ConvertBack method parameters. In many cases this feature Bindable ConverterParameter is exactly what ones need. In this article I'll show a relatively simple and straightforward technique to achieve just that.

The XAML part that will implement the bound ConverterParameter will look as close as possible to the Error producing line of code above, with the exception that it will work The following example shows how to implement the IValueConverter interface and use the converter when data binding to a collection of objects. You can create a class that allows you to convert the format of your data between the source and the target by inheriting from IValueConverter.

For example, you might want to have a list of colors that you store as RGBA values, but display them with color names in the UI. By implementing Convert and ConvertBack , you can change the format of the data values as they are passed between the target and source by the binding engine.

You should always implement Convert with a functional implementation, but it's fairly common to implement ConvertBack so that it reports a not-implemented exception. You only need a ConvertBack method in your converter if you are using the converter for two-way bindings, or using XAML for serialization.

UnsetValue should be returned from an IValueConverter implementation that provides conversion in a data binding to a dependency property, in any case where the converter is unable to convert a source value.

Converters shouldn't throw exceptions for that case in Convert ; these will surface as run-time exceptions that you'd need to add handling for in UnhandledException or worse yet appear to users as actual run-time exceptions.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked It fails with message "A binding can't be set on the converterParameter property of type Binding.

A binding can only be set on dependencyProperty". As Brian has identified, Binding target must be a dependency property. In this situation, I would be defining some dependency properties in my Converter. I can bind them to the properties in the data context. All of this can be done in the Resources Section. Not neccessarily. Depends on how the object structure is set up. If the child object has a parent property, then you could bind to the Parent. You could also bind to the DataContext. Property of the logical parent.

Or you could bind using the ElementName syntax. There are quite a few ways to do it. My answer was based off the code provided and assumed the poster had already solved the parent property binding issue.

As Brian and Muhammad said, Binding. ConverterParameter is not a dependency property so it cannot be the target of a binding. The IMultiValueConverter workaround Brian suggested is a general workaround in case you want to bind converter parameter.