Cannot deserialize the current JSON object e g name value into type System Collections Generic List 1

Question

using System  using System Collections Generic  using System Linq  using System Text  using Facebook  using Newtonsoft Json   namespace facebook       class Program               static void Main string   args                        var client   new FacebookClient acc ess               dynamic result   client Get  fql   new   q    select target id target type from connection where source id   me                   string jsonstring   JsonConvert SerializeObject result                  jsonstring   data     target id  9503123  target type   user                 List lt RootObject gt  datalist   JsonConvert DeserializeObject lt List lt RootObject gt  gt  jsonstring                      public class Datum                       public Int64 target id   get  set                public string target type   get  set                       public class RootObject                                 public List lt Datum gt  data   get  set                           Cannot deserialize the current JSON object  e g    name   value      into type    System Collections Generic List 1 facebook Program RootObject     because the type requires a JSON array  e g   1 2 3   to deserialize   correctly  To fix this error either change the JSON to a JSON array    e g   1 2 3   or change the deserialized type so that it is a normal    NET type  e g  not a primitive type like integer  not a collection   type like an array or List  that can be   I looked at other posts   My json looks like this     data     target id  9503123  target type   user

User · Answer

As the error message is trying very hard to tell you  you can t deserialize a single object into a collection  List lt  gt     You want to deserialize into a single RootObject

User · Answer

Can you try to change your json without data key like below     quot target id quot  9503123  quot target type quot   quot user quot

User · Answer

To make it clear  in addition to  SLaks  answer  that meant you need to change this line    List lt RootObject gt  datalist   JsonConvert DeserializeObject lt List lt RootObject gt  gt  jsonstring     to something like this    RootObject datalist   JsonConvert DeserializeObject lt RootObject gt  jsonstring

User · Answer

The real problem is that you are using dynamic return type in the FacebookClient Get method  And although you use a method for serializing  the JSON converter cannot deserialize this Object after that    Use insted of   dynamic result   client Get  fql   new   q    select target id target type from connection where source id   me        string jsonstring   JsonConvert SerializeObject result     something like that   string result   client Get  fql   new   q    select target id target type from connection where source id   me      ToString      Then you can use DeserializeObject method   var datalist   JsonConvert DeserializeObject lt List lt RootObject gt  gt  result     Hope this helps

User · Answer

That happened to me too  because I was trying to get an IEnumerable but the response had a single value  Please try to make sure it s a list of data in your response  The lines I used  for api url get  to solve the problem are like these   HttpResponseMessage response   await client GetAsync  api yourUrl     if  response IsSuccessStatusCode        IEnumerable lt RootObject gt  rootObjects           awaitresponse Content ReadAsAsync lt IEnumerable lt RootObject gt  gt          foreach  var rootObject in rootObjects                Console WriteLine                0  t  1  t 2                rootObject Data1  rootObject Data2  rootObject Data3              Console ReadLine        Hope It helps

[c#] Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1

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