System.TypeLoadException使用Newtonsoft JSON反序列化

Question

我真的很难过这里。这里是我的JSON返回：

{"ResponseData":[{"ClusterID":"c02f1f5c-c61b-4f2c-ab5a-249966b3cdef","ClusterName":"Northeast","Courses":[{"CourseID":"8ab4f2b3-8160-4d7e-b79f-8d8b58926cc0","CourseName":"Home Course","SubCourses":[{"SubCourseName":"SubCourse1","SubCourseNumber":18}]},{"CourseID":"b3223464-333b-4c54-89c2-23908e0510c9","CourseName":"Away Course","SubCourses":[{"SubCourseName":"SubCourse1","SubCourseNumber":19}]}],"IsHomeCluster":true},"ResponseErrors":[]} 

这是我的代码进行反序列化：

 JArray jArr = (JArray)JsonConvert.DeserializeObject(json); 
     foreach (var item in jArr) { 
      foreach (var subitem in item["ResponseData"]) { 
       Console.WriteLine (subitem ["ClusterID"]); 
      } 
     } 

项目编译罚款，但是当我在模拟器中运行它，我得到这个错误：

System.TypeLoadException: A type load exception has occurred. at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType, Boolean checkAdditionalContent) [0x00000] in :0 at Newtonsoft.Json.JsonSerializer.DeserializeInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in :0 at Newtonsoft.Json.JsonSerializer.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in :0 at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in :0 at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value) [0x00000] in :0 at AppMultiView.CourseInformationScreen.ViewDidLoad() [0x00029] in /Users/Dan/Desktop/AppTouch_dev /Screens/CourseInformationScreen.cs:48 at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSend_IntPtr_bool (intptr,intptr,intptr,bool) at MonoTouch.UIKit.UINavigationController.PushViewController (MonoTouch.UIKit.UIViewController viewController, Boolean animated) [0x00021] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UINavigationController.g.cs:176 at AppMultiView.HomeScreen.m__2 (System.Object sender, System.EventArgs e) [0x00016] in /Users/Dan/Desktop/AppTouch_dev /Screens/HomeScreen.cs:75 at MonoTouch.UIKit.UIControlEventProxy.Activated() [0x00000] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIControl.cs:30 at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr) at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
at AppMultiView.Application.Main (System.String[] args) [0x00000] in /Users/Dan/Desktop/AppTouch_dev /Main.cs:18

我想反序列化错误的东西？

任何指针将不胜感激。

Answer 1

我不完全确定你看到的是什么问题。这可能只是因为你的json格式不正确。

它有帮助，我通常解决这个问题的方法是：

1. 使用像http://chris.photobooks.com/json/的工具来验证JSON - 在这种情况下，这透露给我一个错误 - 你的“ResponseData “阵列没有终止。固定的代码是：

   {"ResponseData":[ 
       {"ClusterID":"c02f1f5c-c61b-4f2c-ab5a-249966b3cdef","ClusterName":"Northeast", 
       "Courses": 
       [ 
       {"CourseID":"8ab4f2b3-8160-4d7e-b79f-8d8b58926cc0","CourseName":"Home Course","SubCourses": 
        [{"SubCourseName":"SubCourse1","SubCourseNumber":18}]}, 
       {"CourseID":"b3223464-333b-4c54-89c2-23908e0510c9","CourseName":"Away Course","SubCourses": 
        [{"SubCourseName":"SubCourse1","SubCourseNumber":19}]} 
       ], 
       "IsHomeCluster":true} 
   ] 
   ,"ResponseErrors":[]} 
   

2. 复制修正JSON到http://json2csharp.com/

   这给了我类，如：

   public class SubCours 
   { 
       public string SubCourseName { get; set; } 
       public int SubCourseNumber { get; set; } 
   } 
   
   public class Cours 
   { 
       public string CourseID { get; set; } 
       public string CourseName { get; set; } 
       public List<SubCours> SubCourses { get; set; } 
   } 
   
   public class ResponseData 
   { 
       public string ClusterID { get; set; } 
       public string ClusterName { get; set; } 
       public List<Cours> Courses { get; set; } 
       public bool IsHomeCluster { get; set; } 
   } 
   
   public class RootObject 
   { 
       public List<ResponseData> ResponseData { get; set; } 
       public List<object> ResponseErrors { get; set; } 
   } 
   

3. 使用JsonConvert.DeserializeObject<RootObject>(json)获得反序列化RootObject

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还有一个新的粘贴为类功能的JSON可供选择：http://blogs.msdn.com/b/webdev/archive/2012/12/18/paste-json-as-classes-in-asp-net-and-web-tools-2012-2-rc.aspx