TFS忽略规则不生效与连接频繁中断问题咨询

Let's break down your two issues one by one, with actionable fixes for each:

1. Why isn't my .tfignore file taking effect? #

The most common reasons your .tfignore rules (like \Build\Scripts*.sum) aren't working, plus the "temporary fix via VS UI" behavior you're seeing, usually boil down to these factors:

• The files are already tracked by TFS
  .tfignore only applies to files that haven't been added to version control yet. If those .sum files were previously checked in or added to TFS's pending changes, the ignore rule won't override that. When you use the VS UI to "exclude" files, it just hides them temporarily in your workspace—but since they're still in TFS's tracked list, the setting resets when your connection drops.
  Fix: Run tf undo /recursive $/YourProject/Build/Scripts/*.sum to remove pending adds, then use tf delete /keeplocal $/YourProject/Build/Scripts/*.sum to remove them from TFS while keeping local copies. After that, your .tfignore rule will stick.

• Incorrect path formatting in .tfignore
  Your rule \Build\Scripts*.sum has two issues: it starts with a backslash (which makes it an absolute path relative to the server root, not your workspace root) and is missing a slash between Scripts and *.sum. Use relative paths instead—for example:

  Build/Scripts/*.sum
  

  If the Build folder could be anywhere in your workspace, use a wildcard to match nested paths:

  **/Build/Scripts/*.sum
  

• Problems with the .tfignore file itself
  Double-check:

  • The filename is exactly .tfignore (no .txt extension, no extra characters—Windows might hide the extension by default, so enable "Show hidden files" to verify).
  • The file is saved as UTF-8 without BOM encoding. TFS can fail to parse files with BOM markers.

• Stale TFS workspace cache
  Sometimes cached workspace data prevents new .tfignore rules from applying. Clear the cache by running this command in Developer Command Prompt for Visual Studio:

  tf workspaces /remove:*
  

  Then re-map your workspace and refresh pending changes.

2. Why does TFS keep disconnecting, and why does restarting VS fix it temporarily? #

This intermittent connection issue with permission errors is typically related to cached sessions, network quirks, or workspace configuration:

• Corrupted Team Explorer cache
  Visual Studio's Team Explorer stores temporary connection data that can get corrupted over time. Restarting VS clears this cache temporarily, but it builds up again. To fix it permanently:

  1. Close all VS instances.
  2. Delete the cache folder (path varies by VS version—for VS 2022, it's %LOCALAPPDATA%\Microsoft\Team Foundation\17.0\Cache).
  3. Restart VS and reconnect to TFS.

• Server-side session timeout
  Your TFS server might be configured to drop idle sessions after a short period. VS might not automatically re-authenticate when the session expires, leading to "no access permission" errors. Ask your TFS admin to check the session timeout settings, or enable auto-reconnection in VS: Go to Team Explorer > Settings > Source Control > Environment and make sure "Auto-reconnect to Team Foundation Server" is checked.

• Unstable network or proxy/firewall interference
  Fluctuating network connectivity or a firewall/proxy that blocks persistent connections can cause TFS to drop. Try:

  • Pinging your TFS server continuously to check for packet loss.
  • Adding VS and the tf.exe command-line tool to your firewall's allowed list.
  • If using a proxy, verify the proxy settings in VS are correct (Tools > Options > Environment > Web Browser > Proxy Settings).

• Workspace mapping corruption
  A corrupted workspace mapping can cause connection inconsistencies. Try creating a new workspace, re-mapping your project folders, and abandoning the old workspace. This often resolves persistent connection glitches.

• VS version incompatibility
  If you're using an older VS version with a newer TFS server, compatibility issues can cause unstable connections. Make sure your VS version is supported by your TFS server and install the latest updates for VS.

内容的提问来源于stack exchange，提问作者Ethan Schofer