Using value converters

Converters are often useful when you want to perform data binding between two properties that have incompatible types. In such cases, you will need a piece of code which creates a bridge between source and target. This piece of code is defined as a value converter.

The IValueConverter interface is used to create value converters and contains two methods named Convert and ConvertBack:

• Convert(...): It gets called when the source updates the target object
• ConvertBack(...): It gets called when the target object updates the source object

In this recipe, we will learn how to create value converters and use them while data binding.

Getting ready

Let's begin by creating a new WPF project. Call it CH04.ConverterDemo.

How to do it...

To begin with the value converter, perform the following steps:

1. From the Solution Explorer, open the MainWindow.xaml file.
2. Replace the existing Grid with the following XAML markup, which contains a CheckBox and a Rectangle inside a StackPanel:

<StackPanel...