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How to use IValueConverter in Binding of WPF

IValueConverter

Converter is actually a property within the Binding Markup Extension. Its type is defined as IValueConverter . Every time the bound data elements refreshes its value it passes through a method Convert which is defined inside the object Converter (if found). Thus Converter acts as an interface to manipulate the actual data before passing it to the property.

To use the Converter you need to create a resource of the object. Thus in XAML you need to declare :

Where local is the namespace added which points to the Current Namespace. Finally to define the Converter, you need to use this as StaticResource in the Converter.

Remember one thing, in the above line, you need to make sure you are clear about what you are sending. In this case, we are binding Height with the ActualHeight of the element win. So, in the arguments of Convert, you will receive a double value with current ActualHeight , and you are going to return the value that you want to be set to Height. So actually you are sending a double value and returning another.

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