I am trying to create a user interface using XAML. However, the file is quickly becoming very large and difficult to work with. What is the best way for splitting it across
Use styles and user controls. Divide your interface on smaller parts and code them in another xaml files. Example:
...
..
divide it into three xaml files:
Window.xaml - this will be Window
VeryBigControl.xaml - this will be UserControl
VeryBigControlStyle.xaml - this will be resource dictionary
and so on :)