Visual Studio 2017 Enterprise中Xamarin.Forms Previewer消失问题求助

Hey there, sorry to hear the Xamarin.Forms Previewer suddenly vanished on you—let’s walk through some common fixes to get it back up and running:

• Check if the Previewer was accidentally disabled

  1. Go to Tools > Extensions and Updates
  2. Switch to the Installed > All category, then search for "Xamarin.Forms Previewer"
  3. If it shows as "Disabled", right-click it and select Enable, then restart Visual Studio

• Reset your Visual Studio window layout
  Sometimes a messed-up window layout can hide tools you know are there. Try:
  Window > Reset Window Layout
  After restarting VS, navigate back to View > Other Windows to see if the Previewer reappears.

• Repair your Visual Studio installation
  Corrupted components might be the culprit:

  1. Open the Visual Studio Installer, find your VS2017 Enterprise instance, and click Modify
  2. Under the Mobile development with .NET workload, make sure the Xamarin.Forms Previewer option is checked. If it’s not, check it and click Modify to complete the repair.

• Clear Visual Studio’s cache
  Stale cache can cause odd UI glitches. Close VS first, then delete these folders:

  • %LOCALAPPDATA%\Microsoft\VisualStudio\15.0_*\ComponentModelCache
  • %LOCALAPPDATA%\Microsoft\VisualStudio\15.0_*\Temp
    Reopen VS afterward and check for the Previewer.

If none of these work, you could also try updating your Xamarin components to the latest version compatible with VS2017, or check the Visual Studio Activity Log (Help > About Microsoft Visual Studio > View Log) for error messages that might point to the root cause.

内容的提问来源于stack exchange，提问作者NBDKhoa