TFS扩展开发中遇到的坑

本码农最近开发一个VS扩展，其中有些功能涉及到文件的签出。我们公司用的是TFS，遇到了一些奇特的现象，将解决过程记录如下。

一、明明在线的连接却Offline属性等于True

 public static Workspace GetWorkspace(string slnDir)
        {

            var projectCollections = new List<RegisteredProjectCollection>((RegisteredTfsConnections.GetProjectCollections()));
            var onlineCollections = projectCollections.Where(c => !c.Offline).ToList();

            // fail if there are no registered collections that are currently on-line
            if (!onlineCollections.Any())
            {
                return null;
            }
            Workspace workspace = null;
            // find a project collection with at least one team project
            foreach (var registeredProjectCollection in onlineCollections)
            {
                var projectCollection = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(registeredProjectCollection);
                projectCollection.EnsureAuthenticated();
                var versionControl = (VersionControlServer)projectCollection.GetService(typeof(VersionControlServer));
                var teamProjects = new List<TeamProject>(versionControl.GetAllTeamProjects(false));
                // if there are no team projects in this collection, skip it
                if (teamProjects.Count < 1) continue;

                var dir = new DirectoryInfo(slnDir);
                while (workspace == null)
                {
                    workspace = versionControl.TryGetWorkspace(dir.FullName);
                    if (dir.Parent == null)
                        break;
                    dir = dir.Parent;
                }

                if (workspace != null && workspace.HasUsePermission)
                    break;
            }
            return workspace;
        }

　现象就是上面这段代码中

var onlineCollections = projectCollections.Where(c => !c.Offline).ToList();

一句找不到想要的在线的TFS Server

首先尝试了删除Local AppData中(C:Users*AppDataLocalMicrosoftTeam Foundation)的Cache，不起作用。

然后找到注册表

HKEY_USERSS-1-5-21-2532103873-3336248781-2863026242-1503SoftwareMicrosoftVisualStudio11.0TeamFoundationInstances fs.yintai.orgCollectionsPlatformCollection
将此节点下Offline改为0

可以了。

原因不明，可能跟连接了多个TFS有关。

二、TryGetWorkspace方法找不到对应的Workspace

然后又遇到

workspace = versionControl.TryGetWorkspace(dir.FullName);

总是返回null

后改为使用QueryWorkspaces方法遍历所有workspace解决

将这段

 var dir = new DirectoryInfo(slnDir);
                while (workspace == null)
                {
                    workspace = versionControl.TryGetWorkspace(dir.FullName);
                    if (dir.Parent == null)
                        break;
                    dir = dir.Parent;
                }

替换为

  try
                {
                    Workspace[] workspaces = versionControl.QueryWorkspaces(null, Environment.UserName,
                        Environment.MachineName);
                    foreach (var ws in workspaces)
                    {
                        foreach (var folder in ws.Folders)
                        {
                            if (slnDir.StartsWith(folder.LocalItem))
                            {
                                workspace = ws;
                                break;
                            }
                        }
                        if (workspace != null && workspace.HasUsePermission)
                            break;
                    }
                }
                catch
                {
                    continue;
                }