JSON反序列化列表<SomeObject>不起作用

Question

我們使用C＃System.Runtime.Serialization.Json.DataContractJsonSerializer反序列化JSON。它適用於普通對象，但不適用於List。

例如，如果JSON字符串低於然後正常工作：

{"CacheInsertDateTime":"\/Date(1360761324878)\/","Data":{"__type":"SomeObject:#ConsoleApplication1","Symbol":"some string"}} 

但如果josn低於：

{"CacheInsertDateTime":"\/Date(1360761324878)\/","Data":[{"__type":"SomeObject:#ConsoleApplication1","Symbol":"some string"},{"__type":"SomeObject:#ConsoleApplication1","Symbol":"some other string"}]} 

的數據來作爲List<Object>不List<SomeObject>。我附上了樣品解決方案，顯示了同樣的問題。任何幫助或方向表示讚賞。

編輯：添加的代碼

{

命名空間ConsoleApplication1 { 類節目 { /* Someobject類*/ [DataContract] 公共類SomeObject { 公共SomeObject（字符串符號） { this.Symbol = sym; } [DataMember] public string Symbol {get;組; }

} 
    /* Cahe Data */ 
    [DataContract()] 
    [KnownType("GetKnownTypes")] 
    class CacheData 
    { 
     [DataMember()] 
     public object Data { get; set; } 

     [DataMember()] 
     public DateTime CacheInsertDateTime { get; set; } 

     public static IEnumerable<Type> GetKnownTypes(ICustomAttributeProvider provider) 
     { 
      return GetKnownTypes(); 
     } 
     public static IEnumerable<Type> GetKnownTypes() 
     { 
      if (knownTypes == null) 
      { 
       // Since reflection is costly, we will do the lookup once for the known types and persist the data in knownTypes variable 
       knownTypes = new List<Type>(); 

       // first add types from DataModel assembly get types which are marked with DataContract attribute 
       var typesInCurrentAssembly = Assembly.GetExecutingAssembly().GetTypes().Where 
        (t => t.GetCustomAttributes(false).Any(attrib => attrib is DataContractAttribute)); 
       foreach (var type in typesInCurrentAssembly) 
       { 
        // add type and list<type> also to the known types list 
        knownTypes.Add(type); 
        knownTypes.Add(typeof(List<>).MakeGenericType(type)); 
       } 

       knownTypes.Add(typeof(DataTable)); 
      } 
      return knownTypes; 
     } 
     private static List<Type> knownTypes = null; 
    } 

    /*Cache Response Class*/ 
    class CacheResponse<T> where T : class 
    { 
     public CacheData CacheData { get; set; } 
     public T Data 
     { 
      get{return (CacheData != null && CacheData.Data.GetType() == typeof(T)) ? CacheData.Data as T: null;} 
     } 
    } 
    /* Main class */ 
    static void Main(string[] args) 
    { 
     //1. first with someobject, it works same as above 
     string jsonString = "{\"CacheInsertDateTime\":\"\\/Date(1360761324878)\\/\",\"Data\":{\"__type\":\"SomeObject:#ConsoleApplication1\",\"Symbol\":\"some object 1\"}}"; 
     CacheData obj = null; 
     byte[] byteData = Encoding.UTF8.GetBytes(jsonString); 
     using (MemoryStream stream = new MemoryStream(byteData)) 
     { 
      var serializer = new DataContractJsonSerializer(typeof(CacheData)); 
      obj = serializer.ReadObject(stream) as CacheData; 
     } 
     CacheResponse<SomeObject> response1 = new CacheResponse<SomeObject>(); 
     response1.CacheData = obj; 
     SomeObject responseObj = response1.Data; //this response object is fine    

     //2. with list<someobject>, it does not work 
     jsonString = "{\"CacheInsertDateTime\":\"\\/Date(1360761324878)\\/\",\"Data\":[{\"__type\":\"SomeObject:#ConsoleApplication1\",\"Symbol\":\"some object 1\"},{\"__type\":\"SomeObject:#ConsoleApplication1\",\"Symbol\":\"some object 2\"}]}"; 
     byteData = Encoding.UTF8.GetBytes(jsonString); 
     using (MemoryStream stream = new MemoryStream(byteData)) 
     { 
      var serializer = new DataContractJsonSerializer(typeof(CacheData)); 
      obj = serializer.ReadObject(stream) as CacheData; 
     } 
     CacheResponse<List<SomeObject>> response2 = new CacheResponse<List<SomeObject>>(); 
     response2.CacheData = obj; 
     List<SomeObject> responseList = response2.Data;//this is null    
    } 
} 

}