我不了解JSON.NET，但
JavascriptSerializer在
System.Web.Extensions.dll（.NET 3.5
SP1）中可以正常使用：
using System.Collections.Generic;using System.Web.script.Serialization;public class NameTypePair{ public string OBJECT_NAME { get; set; } public string OBJECT_TYPE { get; set; }}public enum PositionType { none, point }public class Ref{ public int id { get; set; }}public class SubObject{ public NameTypePair attributes { get; set; } public Position position { get; set; }}public class Position{ public int x { get; set; } public int y { get; set; }}public class Foo{ public Foo() { objects = new List<SubObject>(); } public string displayFieldName { get; set; } public NameTypePair fieldAliases { get; set; } public PositionType positionType { get; set; } public Ref reference { get; set; } public List<SubObject> objects { get; set; }}static class Program{ const string json = @"{ ""displayFieldName"" : ""OBJECT_NAME"", ""fieldAliases"" : { ""OBJECT_NAME"" : ""OBJECT_NAME"", ""OBJECT_TYPE"" : ""OBJECT_TYPE"" }, ""positionType"" : ""point"", ""reference"" : { ""id"" : 1111 }, ""objects"" : [ { ""attributes"" : { ""OBJECT_NAME"" : ""test name"", ""OBJECT_TYPE"" : ""test type"" }, ""position"" : { ""x"" : 5, ""y"" : 7 } } ]}"; static void Main() { JavascriptSerializer ser = new JavascriptSerializer(); Foo foo = ser.Deserialize<Foo>(json); }}编辑：
Json.NET使用相同的JSON和类进行工作。
Foo foo = JsonConvert.DeserializeObject<Foo>(json);
链接：使用Json.NET序列化和反序列化JSON
