FetchTimer Sample

This sample demonstrates some aspects of caching (prefetching) in Microsoft UI Automation and supplies comparative performance values.

After launching the sample, leave it in the foreground while moving the cursor over various elements on the desktop. Press Alt+G to retrieve the AutomationElement at the cursor. The sample performs three tests: fetching the element without caching, fetching it with caching, and updating the cache.

You can set the scope and caching mode of element retrieval by using the checkboxes.


The sample is designed to demonstrate the use of CacheRequest and related classes and methods, but does not necessarily reflect a real-world implementation of UI Automation caching as a whole.

This sample demonstrates a specific feature of the Windows Presentation Foundation (WPF) and, consequently, does not follow application development best practices. For comprehensive coverage of Windows Presentation Foundation (WPF) and Microsoft .NET Framework application development best practices, refer to the following as appropriate:

Accessibility - Accessibility Best Practices

Security - Windows Presentation Foundation Security

Localization - WPF Globalization and Localization Overview

Download sample

Building the Sample

  • Install the Windows Software Development Kit (SDK) and open its build environment command window. On the Start menu, point to All Programs, Microsoft Windows SDK, and then click CMD Shell.

  • Download the sample, usually from the software development kit (SDK) documentation, to your hard disk drive.

  • To build the sample from the build environment command window, go to the source directory of the sample. At the command prompt, type MSBUILD.

  • To build the sample in Microsoft Visual Studio, load the sample solution or project file and then press CTRL+SHIFT+B.

Running the Sample

  • To run the sample from the build environment command window, execute the .exe files in the Bin\Debug or Bin\Release folder contained in the sample source folder.

  • To run the compiled sample with debugging in Visual Studio, press F5.

See Also


Use Caching in UI Automation


Caching in UI Automation Clients

Other Resources

UI Automation Clients for Managed Code