To clean up, remove the variable when you are finished debugging. In the dialog box that opens, choose Environment Variables, then add it as a user variable, and set the value to 1. To set an environment variable, use the Start button to search for environment variable and choose Edit the system environment variables. ![]() If you want to use XAML Hot Reload with the Debug > Attach to Process command instead, then set the environment variable yourself. Visual Studio sets the value automatically as part of the Debug > Start Debugging (or F5) command. XAML Hot Reload requires that the environment variable ENABLE_XAML_DIAGNOSTICS_SOURCE_INFO is set to 1 at the time application starts. Verify that you use Start Debugging rather than Attach to Process Next, in the Options dialog box, make sure that the Enable XAML Hot Reload option is selected. If you don't see the in-app toolbar, then select Debug > Options > XAML Hot Reload from the Visual Studio menu bar. When you start debugging your app, make sure you see the in-app toolbar, which confirms that XAML Hot Reload is available. The feature is enabled by default in Visual Studio 2019 and later versions. If you see the message Hot Reload is not available in the in-app toolbar while debugging your app, follow the instructions described in this article to resolve the issue. For details on operating system and tooling requirements, see Write and debug running XAML code with XAML Hot Reload. ![]() XAML Hot Reload is supported for WPF and UWP apps. This troubleshooting guide includes detailed instructions that should resolve most issues that prevent XAML Hot Reload from working correctly. Applies to: Visual Studio 2019 and later versions
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