使用 TFS 2012 API，如何获取用户的电子邮件地址?

我正在尝试使用 API 获取 TFS 2012 中特定用户的电子邮件地址.我已经在个人资料"部分设置了用户首选电子邮件地址.我在网上做了很多搜索，得到了以下代码.

I am trying to get the email address of a particular user in TFS 2012 using the API. I have set the users Preferred Email address in the Profile section. I have done plenty of searching online and have the following code.

var userId = "myUserId";
var collection = new TfsTeamProjectCollection(tfsUri, tfsCerd);
var managementService = collection.GetService<IIdentityManagementService>();

var member =
    managementService
        .ReadIdentity(
            IdentitySearchFactor.AccountName,
            userId,
            MembershipQuery.Direct,
            ReadIdentityOptions.ExtendedProperties);

var emailAddress = member.GetAttribute("Mail", null)

这段代码既成功又失败.成功检索到指定用户即为成功；但是，问题是 Email 属性为空.当我分析成员变量时，我注意到Mail"属性列在那里并且是空的.然后我注意到还有另外两个名为ConfirmedNotificationAddress"和CustomNotificationAddress"的属性，它们正确地包含了我的首选电子邮件地址.

This code is both a success and a failure. It is a success in that it successfully retrieves the specified user; however, the problem is that the Email attribute is blank. When I analyzed the member variable, I noticed the "Mail" attribute was listed there and it was empty. I then noticed there were two other attributes called "ConfirmedNotificationAddress" and "CustomNotificationAddress" that had my preferred email address correctly in there.

我想知道为什么我似乎无法使用首选电子邮件地址正确加载Mail"变量，因为我需要此代码才能在很多人的服务器上工作.

I am wondering why I can't seem to get the "Mail" variable to load properly with the preferred email address as I will need this code to work on a lot of peoples servers.