Multi-bindings

Multi-binding is a powerful feature in XAML data binding that allows you to bind a single target property to multiple source properties and then apply logic to produce one single value. This technique is particularly useful when a target property’s value depends on more than one source property. The simplest example of this is using StringFormat.

Multi-binding StringFormat

A typical multi-binding scenario is where you would like to display multiple values in one label. We could, of course, create a property on the ViewModel that concatenates those values, or we could define this as a Multi-binding with StringFormat.

As an example, we want to show the author of the recipe next to the Last updated timestamp that we already have on our page (Figure 4.9):

Figure 4.9: Showing the author next to the Last updated timestamp

Here’s how it’s done:

1. First, let’s add an Author property to our ViewModel:

   public...