升级至Visual Studio 17后，Unreal Engine项目Intellisense识别异常求助

Let’s work through this step by step—this is a super common hiccup when upgrading VS versions with Unreal projects, and there are a few reliable fixes to get those annoying red squiggles gone:

1. Regenerate Unreal Project Files #

Unreal’s project files are tightly tied to your VS version, so upgrading usually breaks the old ones. Here’s how to refresh them:

• Right-click your .uproject file
• Select Generate Visual Studio project files
• Wait for the process to finish, then reopen the project in VS 17. This forces Unreal to create new files optimized for the newer VS version, which often fixes IntelliSense’s inability to find core Unreal types like FName, FString, and AActor.

2. Reset Visual Studio’s IntelliSense Cache #

Sometimes VS hangs onto old cache data from the previous version, which can block it from recognizing new or updated Unreal references:

• In VS 17, go to Tools > Options > Text Editor > C/C++ > Advanced
• Scroll down to the IntelliSense section
• Find Reset IntelliSense Database and click it
• Restart VS and let IntelliSense rebuild the cache from scratch. Note: This might take 10-20 minutes depending on your project size, but it’s way faster than waiting hours with no progress!

3. Verify Unreal Engine’s VS Version Association #

Make sure Unreal is actually set to use VS 17 for your project:

• Open the Unreal Engine Launcher
• Go to Library > Engine Versions, right-click the engine version your project uses
• Select Options and confirm that Visual Studio 2022 (17) is set as the default editor for C++ projects. If not, switch it here and regenerate project files again.

4. Check for Missing Include Paths (Manual Fix) #

If the above steps don’t work, double-check that VS is pulling in Unreal’s core include directories:

• Right-click your project in VS’s Solution Explorer > Properties
• Go to Configuration Properties > C/C++ > General
• Under Additional Include Directories, ensure paths like $(EngineDir)/Source/Runtime/Core/Public and $(EngineDir)/Source/Runtime/Engine/Public are present. If they’re missing, add them manually (using the $(EngineDir) macro avoids typing long absolute paths).

5. Disable Unnecessary VS Extensions #

Occasionally, third-party extensions can interfere with Unreal’s IntelliSense. Try temporarily disabling all non-essential extensions:

• Go to Extensions > Manage Extensions
• Disable any extensions that aren’t directly related to Unreal or C++ development
• Restart VS and see if the issue resolves. You can re-enable them one by one later to pinpoint the culprit if needed.

I’ve seen most folks fix this with the first two steps—regenerating project files and resetting the IntelliSense cache usually does the trick. Give them a shot in order, and you should have those Unreal types recognized properly in no time!

内容的提问来源于stack exchange，提问作者Koni GTA