我有一个C＃列表，看起来像这样：

var reqUsers = from user in users
    select new
    {
        username = user.username,
        firstName = user.firstName,
        lastName = user.lastName,
        email = user.email
    };

我使用以下代码将JSON转换/序列化为（Newtonsoft.JSON）：

var json = JsonConvert.SerializeObject(reqUsers);

使用上面的代码，我得到一个像这样的json字符串：

[{ username: "alan", firstName: "Alan", lastName: "Johnson", email: "alan@test.com" },
 { username: "allison", firstName: "Allison", lastName: "House", email: "al@test.com" },
 { username: "ryan", firstName: "Ryan", lastName: "Carson", email: "ryan@test.com" } ]

但是，这就是我需要得到的：由于我正在使用把手模板-

var testdata = {
  users: [
  { username: "alan", firstName: "Alan", lastName: "Johnson", email: "alan@test.com" },
  { username: "allison", firstName: "Allison", lastName: "House", email: "al@test.com" },
  { username: "ryan", firstName: "Ryan", lastName: "Carson", email: "ryan@test.com" } ]

如何使用序列化器如上所述命名JSON数组？