C# 使用 Newtonsoft.Json 解析 JSON 时出错
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Errors parsing JSON using Newtonsoft.Json
提问by whoacowboy
I am getting the following error when I try and parse my JSON using Newtonsoft.Json using
当我尝试使用 Newtonsoft.Json 解析我的 JSON 时出现以下错误
Response result = JsonConvert.DeserializeObject<Response>(unfilteredJSONData);
Can not add property string to Newtonsoft.Json.Linq.JObject. Property with the same name already exists on object.
无法向 Newtonsoft.Json.Linq.JObject 添加属性字符串。对象上已存在同名属性。
I have no control over the JSON feed and they just added flags1and flags2. The duplicate string seems to be causing the error, but I don't have any good idea on how to resolve it. This code was working well until the addition of the new fields.
我无法控制 JSON 提要，他们只是添加了flags1和flags2. 重复的字符串似乎导致了错误，但我对如何解决它没有任何好主意。在添加新字段之前，此代码运行良好。
Update:
更新：
The first error was caused by using an outdated version of JSON.net. There was a built-in version with the CMS system I am using and it was 3.5. When I use 4.5 I get a new error:
第一个错误是由使用过时版本的 JSON.net 引起的。我正在使用的 CMS 系统有一个内置版本，它是 3.5。当我使用 4.5 时，我收到一个新错误：
Can not add Newtonsoft.Json.Linq.JValue to Newtonsoft.Json.Linq.JObject.
无法将 Newtonsoft.Json.Linq.JValue 添加到 Newtonsoft.Json.Linq.JObject。
It turns out my JSON below was not exactly the same format as what I am dealing with. Please note the update. The error seems to be caused here:
事实证明，我下面的 JSON 格式与我正在处理的格式不完全相同。请注意更新。错误似乎是在这里引起的：
"flags1": {
"string": "text",
"string": "text"
},
The JSON is:
JSON 是：
{
"result":
{
"lookups":
[
{
"groups":
[
{
"item0": "text",
"item1": "text",
"item2": 0,
"item3": 0,
"item4": 11.5,
"item5": true
},
{
"item6": "text",
"oddName": "text"
},
{
"item7": {
"subitem0": "text",
"subitem1": 0,
"subitem2": true
},
"item8": {
"subitem0": "string",
"subitem1": 0,
"subitem2": true
}
},
{
"url": "http://google.com",
"otherurl": "http://yahoo.com",
"alturllist": [],
"altotherurl": []
},
{},
{
"flags1": {
"string": "text"
},
"flags2": {
"string": "text"
}
}
]
},
{
"groups":
[
{
"item0": "text",
"item1": "text",
"item2": 0,
"item3": 0,
"item4": 11.5,
"item5": true
},
{
"item6": "text",
"oddName": "text"
},
{
"item7": {
"subitem0": "text",
"subitem1": 0,
"subitem2": true
},
"item8": {
"subitem0": "string",
"subitem1": 0,
"subitem2": true
}
},
{
"url": "http://google.com",
"otherurl": "http://yahoo.com",
"alturllist": [],
"altotherurl": []
},
{},
{
"flags1": {
"string": "text",
"string": "text"
},
"flags2": {}
}
]
}
]
}
}
The C# classes are:
C# 类是：
// response
[DataContract]
public class Response
{
[DataMember(Name = "result")]
public Result result { get; set; }
}
[DataContract]
public class Result
{
[DataMember(Name = "lookups")]
public List<Item> lookups { get; set; }
}
[DataContract]
public class Item
{
[DataMember(Name = "groups")]
public List<Dictionary<string, object>> groups { get; set; }
}
I have simplified the JSON and code example for clarity.
为清楚起见，我简化了 JSON 和代码示例。
I included the code aspx to simplify reproducing.
我包含了代码 aspx 以简化再现。
test.aspx
测试.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<code>
<%=response %>
</code></div>
</form>
</body>
</html>
test.aspx.cs
测试文件
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Runtime.Serialization;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NLog;
public partial class Test : System.Web.UI.Page
{
public string response = string.Empty;
public static string cacheDirPath = HttpRuntime.AppDomainAppPath + "cache\";
private static Logger log = LogManager.GetLogger("productFeed");
protected void Page_Load(object sender, EventArgs e)
{
response = readDataFromFile(cacheDirPath + "test2.json");
Response masheryResult = JsonConvert.DeserializeObject<Response>(response);
}
private string readDataFromFile(string filePath)
{
string JSONData = string.Empty;
try
{
StreamReader myFile = new StreamReader(filePath);
JSONData = myFile.ReadToEnd();
myFile.Close();
}
catch (Exception e)
{
log.Warn(e.Message);
}
return JSONData;
}
}
// response
[DataContract]
public class Response
{
[DataMember(Name = "result")]
public Result result { get; set; }
}
[DataContract]
public class Result
{
[DataMember(Name = "lookups")]
public List<Item> lookups { get; set; }
}
[DataContract]
public class Item
{
[DataMember(Name = "groups")]
public List<Dictionary<string, object>> groups { get; set; }
}
采纳答案by Connie Hilarides
Both the properties in the "flags1" object are named "string", you can't define a property twice.
“flags1”对象中的两个属性都被命名为“string”，一个属性不能定义两次。
Edit: It seems that, at least in the latest nuget version, JObject.Parse skips over the error and properly parses the data! I hope you can make that work for you.
编辑：看来，至少在最新的 nuget 版本中，JObject.Parse 会跳过错误并正确解析数据！我希望你能让它为你工作。
Here's an example of how you can do it:
这是一个如何做到这一点的示例：
Response result = JObject.Parse(unfilteredJSONData).ToObject<Response>();
回答by quckly
In additional to Connor Hilarides answer, it can be used including arrays:
除了 Connor Hilarides 的回答之外，它还可以用于包括数组：
JToken resultToken = JToken.Parse(unfilteredJSONData);
