在將部分json轉換爲c＃對象時發生了類型'Newtonsoft.Json.JsonReaderException'的第一次機會異常

Question

因此，這裏我有JsonResult jr，它看起來像這樣（輸出是單行，我在此格式化）：

string jr = {"Results": 
    [ 
     {"Code":"DEMO", 
     "Id":"1285", 
     "Office":"9881", 
     "Customers": 
      [ 
      2713, 
      94204 
      ], 
     "Account":196, 
     "Appointments": 
      [ 
      14, 
      58 
      ], 
     "Role":0, 
     "UserName":"demo", 
     "UserId":3669, 
     "FirstName":"Peter", 
     "LastName":"Pan", 
     "Phones": 
      [ 
      "(888) 888-8888" 
      ], 
     "Fax":null, 
     "Email":"test@test.com", 
     "SMS":null, 
     "RecordStatus":"1"}, 


     {"Code":"DEMO", 
     "Id":"9292", 
     "Office":"9881", 
     "Customers": 
      [ 
      13, 
      904 
      ], 
     "Account":196, 
     "Appointments": 
      [ 
      14, 
      58 
      ], 
     "Role":0, 
     "UserName":"berry", 
     "UserId":302, 
     "FirstName":"Jimmy", 
     "LastName":"White", 
     "Phones": 
      [ 
      "(888) 888-8888" 
      ], 
     "Email":"test@test.com", 
     "SMS":null, 
     "RecordStatus":"1"} 
    ], 
"TotalResults":2, 
"MilliSeconds":4} 

這裏是我的對象User：

public class User 
{ 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 
    public string Id { get; set; } 
    public string Office { get; set; } 
    public string Email { get; set; } 
    public string Code { get; set; } 
} 

我試圖用反序列化JSON的部分片段與JSON映射到我的對象： http://www.newtonsoft.com/json/help/html/SerializingJSONFragments.htm

我跟着這個例子，但是我得到了一個錯誤：Newtonsoft.Json.dll異常類型'Newtonsoft.Json.JsonReaderException'的第一次機會異常發生在Newtonsoft.Json.dll。

很多人在線說它是由壞json引起的。我檢查了我自己，沒有發現任何錯誤。下面是我的代碼：

JObject response = JObject.Parse(jr); 
IList<JToken> results = response["Results"].Children().ToList(); 

IList<User> searchResults = new List<User>(); 
foreach(JToken result in results) 
{ 
    System.Diagnostics.Debug.WriteLine(result); //just to check my json data. 
    User searchResult = JsonConvert.DeserializeObject<User>(results.ToString()); //get exception on this line. 
    searchResults.Add(searchResult); 
} 

第一result輸出看起來是這樣的：

{ 
     "Code":"DEMO", 
     "Id":"1285", 
     "Office":"9881", 
     "Customers": 
      [ 
      2713, 
      94204 
      ], 
     "Account":196, 
     "Appointments": 
      [ 
      14, 
      58 
      ], 
     "Role":0, 
     "UserName":"demo", 
     "UserId":3669, 
     "FirstName":"Peter", 
     "LastName":"Pan", 
     "Phones": 
      [ 
      "(888) 888-8888" 
      ], 
     "Fax":null, 
     "Email":"test@test.com", 
     "SMS":null, 
     "RecordStatus":"1" 
} 

不知道爲什麼這發生異常時，不知道如何解決它..

Answer 1

在這一行：

User searchResult = JsonConvert.DeserializeObject<User>(result.ToString()) // result and not results 

你想反序列化一個簡單的結果而不是結果。

全碼：

JObject response = JObject.Parse(jr); 
IList<JToken> results = response["Results"].Children().ToList(); 

IList<User> searchResults = new List<User>(); 
foreach (JToken result in results) 
{ 
    System.Diagnostics.Debug.WriteLine(result); //just to check my json data. 
    User searchResult = JsonConvert.DeserializeObject<User>(result.ToString()); //get exception on this line. 
    searchResults.Add(searchResult); 
} 

順便說一句，你可以用一些基本的LINQ更換循環：

JObject response = JObject.Parse(jr); 
IList<User> searchRes = response["Results"].Select(r => JsonConvert.DeserializeObject<User>(r.ToString())).ToList();