在做了更多研究之后，我发现了问题所在.我们的 TFS 的结构类似于以下内容:

After doing some more research I figured out the problem. Our TFS is structured similarly to the following:

$/Root
$/Root/Folder
$/Root/Folder/Branch

向下的第一级不会返回任何分支，因为没有任何分支.因此，我使用了一种更简单的方法来获取所有分支.

The first level down would not return any Branches because there aren't any. So Instead I used a simpler approach that gets all of the Branches.

var branchObjects = vcs.QueryRootBranchObjects(RecursionType.Full);

        foreach (var branch in branchObjects)
        {           
            var branchName = branch.Properties.RootItem.Item;
            var parentFolder = branchName.Substring(0, branchName.LastIndexOf('/'));

            if (!_listOfBranches.Contains(parentFolder))
            {
                _listOfBranches.Add(parentFolder);
            }
            _listOfBranches.Add(branchName);
        }
        _listOfBranches.Sort();

目前这不是最干净的方法.但它能够检索指定项目的所有分支，以及父文件夹(目前不包括根).

It's not the cleanest approach at the moment. But it's able to retrieve all the Branches for the specified project, as well as the Parent Folders (excluding the Root, for now).