无法将当前的JSON对象反序列化（例如{“name”：“value”}）转换为“System.Collections.Generic.List”1类型 [英] Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1

问题描述

 使用系统; 
使用System.Collections.Generic; 
使用System.Linq; 
使用System.Text; 
使用Facebook; 
使用Newtonsoft.Json; 
 
命名空间facebook 
 {
类程序
 {
 static void Main（string [] args）
 {
 var client =新的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}]} 
列表< RootObject> datalist = JsonConvert.DeserializeObject< List< RootObject>>（jsonstring）; 
} 
 
 public class Datum 
 {
 public Int64 target_id {get;组; } 
 public string target_type {get;组; } 
} 
 
 public class RootObject 
 {
 public List< Datum>数据{get;组; } 
} 
} 
} 
  

无法反序列化当前的JSON对象（例如{name：value}）
into
'System.Collections.Generic.List`1 [facebook.Program + RootObject]'
因为类型需要一个JSON数组（例如[1,2,3]）来正确反序列化
。要修复此错误，请将JSON更改为JSON数组
（例如[1,2,3]）或更改反序列化类型，以使其成为正常的
.NET类型（例如，不是原始类型像整数，不是集合
类型像数组或列表）可以

我看了其他帖子。 / p>

我的json看起来像这样：

  {data {target_id：9503123target_type：user}}} 
  

解决方案

为了说清楚，除了@SLaks的答案，这意味着你需要改变这一行：

 列表与LT; RootObject> datalist = JsonConvert.DeserializeObject< List< RootObject>>（jsonstring）; 
  

如下所示：

  RootObject datalist = JsonConvert.DeserializeObject< RootObject>（jsonstring）; 
  

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<RootObject> datalist = JsonConvert.DeserializeObject<List<RootObject>>(jsonstring);
        }

        public class Datum
        {
            public Int64 target_id { get; set; }
            public string target_type { get; set; }
        }

        public class RootObject
        {          
            public List<Datum> 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"}]}

解决方案

To make it clear, in addition to @SLaks' answer, that meant you need to change this line :

List<RootObject> datalist = JsonConvert.DeserializeObject<List<RootObject>>(jsonstring);

to something like this :

RootObject datalist = JsonConvert.DeserializeObject<RootObject>(jsonstring);

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