Monday, July 7, 2014


XAML "pronounced zammel" stands for Extensible Application Markup Language and will instantiate .NET objects (the code in the separation between the graphics and code). It is an XML based format. In WPF it will define the arrangement of the parts of the user interface (panels, buttons, and controls).

Microsoft Visual Studio (VS) will often generate the XAML for you, so no need to write it out by hand. However, changes will be made by hand, so understanding what can/cannot be done and the syntax is important.

WPF does not require XAML. VS could allow for a Windows Form approach and make code statements to make the windows, but this would make it difficult to share outside of the VS environment. Also, Microsoft Expression Design can be used to fine tune graphics of the WPF (designers will use this software). So, while WPF does not require it, it allows for the most versatile way to edit it and for collaboration with developers and designers.

XAML is a very light, portable, but not very compact. In VS, WPF will compile into Binary Application Markup Language (BAML), which is a binary representation of the XAML file.

What you need to know:

  • 1. Every element in a XAML maps to an instance of a .NET class and the names must match exactly. A Button element will cause a Button object in .NET.
  • 2. Elements are nested, usually to show containment. If the syntax has is a button nested inside a grid, then on the UI there should be a button inside a grid element.
  • 3. Properties of each class is set through attributes,

XAML Namespaces are declared by using attributes because we need to know the namespace where the class resides. By convention you should declare the namespace in the first tag.

The XAML "code behind" handles what happens after you interact with the User Interface and makes a functioning application.

Source: Apress Pro WPF 4.5 in C# (4th Edition)