C# 在C中迭代JSON数组

我试图弄清楚如何循环一些JSON数据，将其插入数据网格，作为事件日志。然而，试图解析JSON让我头疼

我正在尝试使用Newtonsoft提供的JSON.NET

JSON字符串如下所示：

{
    "result" : "ok",
    "response" : {
    "first" : 0,
    "count" : 190,
    "now" : 1509822169,
    "events" : [
    {
        "index" : 0,
        "time" : 1509815973,
        "name" : "SessionCreated",
        "attributes" : {}
    },
    {
        "index" : 1,
        "time" : 1509815973,
        "name" : "PlayerJoined",
        "refid" : 32896,
        "attributes" : {}
        "Name" : "Dealman",
        "SteamId" : "76561197986562417"
    },
    {
        "index" : 2,
        "time" : 1509815973,
        "name" : "Authenticated",
        "refid" : 32896,
        "attributes" : {}
    },
    {
        "index" : 3,
        "time" : 1509815973,
        "name" : "StateChanged",
        "attributes" : {}
        "PreviousState" : "None",
        "NewState" : "Lobby"
    },
    {
        "index" : 4,
        "time" : 1509815998,
        "name" : "PlayerChat",
        "refid" : 32896,
        "attributes" : {
            "Message" : "This is a message"
        }
    },
    {
        "index" : 5,
        "time" : 1509816030,
        "name" : "StateChanged",
        "attributes" : {}
        "PreviousState" : "Lobby",
        "NewState" : "Loading"
    },
    {
        "index" : 6,
        "time" : 1509816030,
        "name" : "SessionSetup",
        "attributes" : {}
        "GridSize" : 22,
        "MaxPlayers" : 22,
        "PracticeLength" : 0,
        "QualifyLength" : 15,
        "RaceLength" : 6,
        "Flags" : -1316224232,
        "TrackId" : -52972612,
        "GameMode" : -1958878043
    },
    {
        "index" : 7,
        "time" : 1509816030,
        "name" : "StageChanged",
        "attributes" : {
            "PreviousStage" : "Practice1",
            "NewStage" : "Qualifying1",
            "Length" : 15
        }
    },
    {
        "index" : 8,
        "time" : 1509816046,
        "name" : "StateChanged",
        "attributes" : {
            "PreviousState" : "Loading",
            "NewState" : "Race"
        }
    },
    {
        "index" : 9,
        "time" : 1509816046,
        "name" : "ParticipantCreated",
        "refid" : 32896,
        "participantid" : 0,
        "attributes" : {
            "Name" : "Dealman",
            "IsPlayer" : 1,
            "VehicleId" : 1764851930,
            "LiveryId" : 54
        }
    }]}
}

dynamic jsonObj = JsonConvert.DeserializeObject(messageContent);
foreach(var item in jsonObj)
{
    Trace.WriteLine(item.result);
}

我一直在尝试做这样的事情

{
    "result" : "ok",
    "response" : {
    "first" : 0,
    "count" : 190,
    "now" : 1509822169,
    "events" : [
    {
        "index" : 0,
        "time" : 1509815973,
        "name" : "SessionCreated",
        "attributes" : {}
    },
    {
        "index" : 1,
        "time" : 1509815973,
        "name" : "PlayerJoined",
        "refid" : 32896,
        "attributes" : {}
        "Name" : "Dealman",
        "SteamId" : "76561197986562417"
    },
    {
        "index" : 2,
        "time" : 1509815973,
        "name" : "Authenticated",
        "refid" : 32896,
        "attributes" : {}
    },
    {
        "index" : 3,
        "time" : 1509815973,
        "name" : "StateChanged",
        "attributes" : {}
        "PreviousState" : "None",
        "NewState" : "Lobby"
    },
    {
        "index" : 4,
        "time" : 1509815998,
        "name" : "PlayerChat",
        "refid" : 32896,
        "attributes" : {
            "Message" : "This is a message"
        }
    },
    {
        "index" : 5,
        "time" : 1509816030,
        "name" : "StateChanged",
        "attributes" : {}
        "PreviousState" : "Lobby",
        "NewState" : "Loading"
    },
    {
        "index" : 6,
        "time" : 1509816030,
        "name" : "SessionSetup",
        "attributes" : {}
        "GridSize" : 22,
        "MaxPlayers" : 22,
        "PracticeLength" : 0,
        "QualifyLength" : 15,
        "RaceLength" : 6,
        "Flags" : -1316224232,
        "TrackId" : -52972612,
        "GameMode" : -1958878043
    },
    {
        "index" : 7,
        "time" : 1509816030,
        "name" : "StageChanged",
        "attributes" : {
            "PreviousStage" : "Practice1",
            "NewStage" : "Qualifying1",
            "Length" : 15
        }
    },
    {
        "index" : 8,
        "time" : 1509816046,
        "name" : "StateChanged",
        "attributes" : {
            "PreviousState" : "Loading",
            "NewState" : "Race"
        }
    },
    {
        "index" : 9,
        "time" : 1509816046,
        "name" : "ParticipantCreated",
        "refid" : 32896,
        "participantid" : 0,
        "attributes" : {
            "Name" : "Dealman",
            "IsPlayer" : 1,
            "VehicleId" : 1764851930,
            "LiveryId" : 54
        }
    }]}
}

dynamic jsonObj = JsonConvert.DeserializeObject(messageContent);
foreach(var item in jsonObj)
{
    Trace.WriteLine(item.result);
}

我也尝试过一些其他方法，比如使用列表，但我就是无法让它工作，我一直得到RuntimeBinderException。我已经被困了这么长时间了，现在我开始考虑只使用ReEX，因为这似乎比它的价值更大。

我在这里遗漏了什么和/或误解了什么

    var json = @"...";

    var obj = ToObject(json) as IDictionary<string, object>;
    var resp = obj["response"] as IDictionary<string, object>;
    var events = resp["events"];

    public static object ToObject(string json)
    {
        if (string.IsNullOrEmpty(json))
            return null;
        return ToObject(JToken.Parse(json));
    }

    private static object ToObject(JToken token)
    {
        switch (token.Type)
        {
            case JTokenType.Object:
                return token.Children<JProperty>()
                            .ToDictionary(prop => prop.Name,
                                          prop => ToObject(prop.Value),
                                          StringComparer.OrdinalIgnoreCase);

            case JTokenType.Array:
                return token.Select(ToObject).ToList();

            default:
                return ((JValue)token).Value;
        }
    }

json字符串被转换为字典，其中的项是简单值、列表或嵌套字典。在字典上迭代要比使用反射容易得多

---

顺便说一句，json中有一个错误-属性之后缺少逗号：{}。另外，将名称和名称同时作为属性不是一个好主意

您遇到的问题是，因为result是一个顶级属性，它不是集合的一部分，所以尝试使用循环访问它没有任何意义。这将按预期打印正常：

using Newtonsoft.Json;
using System;
using System.IO;

namespace SO47114632Core
{
    class Program
    {
        static void Main(string[] args)
        {
            var content = File.ReadAllText("test.json");
            dynamic json = JsonConvert.DeserializeObject(content);
            Console.WriteLine(json.result);
        }
    }
}

我在项目的根文件夹中添加了test.json和您问题中的json，将Copy to Output Directory设置为始终位于文件属性中：

---

更易于使用的动态版本。

谢谢！至于缺少的逗号，因为它是数组中的最后一个条目，所以有必要吗？此外，返回此数据的HTTP API也嵌入到游戏中。因此，很遗憾，我无法对其进行任何更改。我已经添加了你的代码，我正试图弄清楚它是如何工作的。通过resp[events]循环给了我这个；[first，0][count，302][now，1509826920][events，System.Collections.Generic.List`1[System.Object]]对我来说，它返回了2个错误，我是否缺少一些引用或什么？引发异常：System.Core.dll中的“Microsoft.CSharp.RuntimeBinder.RuntimeBinderException”引发异常：mscorlib中的“Microsoft.CSharp.RuntimeBinder.RuntimeBinderException”。dll@Dealman我试过使用普通的控制台应用程序和.NET核心控制台应用程序，这两种应用程序都能正常工作。事实上，代码是相同的，所以我将编辑我的答案以提供完整的程序。@Dealman Done。如果您仍然有问题，我建议您创建一个新的解决方案并尝试上述方法。如果这样做行得通，你知道这与你当前的项目有关。我肯定它行得通，我只是不太确定RuntimeBinderException的意思——它并没有告诉我太多。您认为这可能是因为我在异步任务中执行此操作？或者在using语句中？string test=json.result；Trace.WriteLinetest；这样做很有效。我猜Trace.WriteLine的工作原理与Console.WriteLine在引擎盖下的工作原理有点不同？哦，非常好！在这里，我想我会用SelectToken以最残忍的方式。。。将做一些更多的测试，但它似乎工作得很好，迄今为止！非常感谢