如何在返回相同对象类型的列表时显示json对象名称/标签?

Here are my Class

这里是我的类

[DataContract(Name="Test")]
public class Test
{
  [DataMember]
  public string Name { get; set; }    
  [DataMember]
  public string Type { get; set; }
}

[DataContract(Name="Root")]
public static class Root
{
   [DataMember(Name="TestList")]
   public static List<Test> TestList { get; set; }
}


Expected Json To be returned 
  {
   "Test":[
    {
    "Name": "MyApp",      
    "Type": "web"
    },
    {
    "Name": "MyDatabase",      
    "Type": "db"
    }
     ]
  }

Actual Json Returned 

 [
  {
    "Name": "MyApp",      
    "Type": "web"
  },
  {
    "Name": "MyDatabase",      
    "Type": "db"
  }
]
[DataContract(Nam