Debugging Expression Trees in Visual Studio (Visual Basic)

You can analyze the structure and content of expression trees when you debug your applications. To get a quick overview of the expression tree structure, you can use the DebugView property, which represents expression trees using a special syntax. (Note that DebugView is available only in debug mode.)

Since DebugView is a string, you can use the built-in Text Visualizer to view it across multiple lines, by selecting Text Visualizer from the magnifying glass icon next to the DebugView label.

Alternatively, you can install and use a custom visualizer for expression trees, such as:

• Readable Expressions (MIT license, available at the Visual Studio Marketplace), renders the expression tree as themeable C# code, with various rendering options:

  

• Expression Tree Visualizer (MIT license) provides a tree view of the expression tree and its individual nodes; and can render the expression tree using Visual Basic syntax:

  

To open a visualizer for an expression tree

1. Click the magnifying glass icon that appears next to the expression tree in DataTips, a Watch window, the Autos window, or the Locals window.

   A list of available visualizers is displayed.:

   

2. Click the visualizer you want to use.

See also

• Expression Trees (Visual Basic)
• Debugging in Visual Studio
• Create Custom Visualizers
• DebugView syntax