C# 如何使用字典解析这个JSON？_C#_Json_Json.net_Steam_Steam Web Api

C# 如何使用字典解析这个JSON？

c# json

C# 如何使用字典解析这个JSON？,c#,json,json.net,steam,steam-web-api,C#,Json,Json.net,Steam,Steam Web Api,我正在制作一个需要解析JSON响应的程序。回复中的大部分数据都是无用的，但我需要用它做一些事情能够从rgInventory部分检索id的搜索，然后获得相应的classid 获取具有此classid的对象的market\u名称 JSON响应（代码片段，以该格式继续）：完整JSON响应：我认为，由于库存中每个项目的标识符不断变化（即从469449975_0到619638799_0），我必须将其反序列化到字典中以下是我迄今为止的代码： namespace SteamTrade { pu

我正在制作一个需要解析JSON响应的程序。回复中的大部分数据都是无用的，但我需要用它做一些事情

能够从

rgInventory

部分检索

id

的搜索，然后获得相应的

classid

获取具有此

classid的对象的market\u名称


JSON响应（代码片段，以该格式继续）：
完整JSON响应：
我认为，由于库存中每个项目的标识符不断变化（即从469449975_0
到619638799_0
），我必须将其反序列化到字典中
以下是我迄今为止的代码：
namespace SteamTrade
{
    public class CSGOInventory
    {
        public static CSGOInventory FetchInventory(string steamId)
        {
            WebClient client = new WebClient();
            var url = "http://steamcommunity.com/profiles/" + steamId + "/inventory/json/730/2/";
            string response =  client.DownloadString(url);
            Dictionary<string, Item> result = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, Item>>(response);
            return new CSGOInventory(result);
        }

        public Item[] Items { get; set; }
        public bool IsPrivate { get; private set; }
        public bool IsGood { get; private set; }

        protected CSGOInventory(Dictionary<string, Item> apiInventory)
        {
            for (int i = 0; i < apiInventory.Count; i++)
            {
                Items[i] = apiInventory.Values.ElementAt(i);
            }
        }

        /*public Item GetItem(int id)
        {
            return (Items == null ? null : Items.FirstOrDefault(item => item.instanceid == id));
        }

        public List<Item> GetItemsByDefindex(int defindex)
        {
            return Items.Where(item => item.def_index == defindex).ToList();
        }*/

        public class Item
        {
            public string AppId = "730";
            public string ContextId = "2";

            [JsonProperty("instanceid")]
            public string instanceid { get; set; }

            [JsonProperty("market_name")]
            public string market_name { get; set; }

            [JsonProperty("def_index")]
            public string def_index { get; set; }

        }

        protected class InventoryResult
        {
            public Item[] items { get; set; }
        }

        protected class InventoryResponse
        {
            public InventoryResult result;
        }

    }
}

这将返回一个错误，说明序列中没有项目。
您正试图将其反序列化到字典中，这显然失败，因为您有无法反序列化到项目的元素，并且在第一个元素上失败，即成功：true

你有两种方法可以继续
var result=（动态）Newtonsoft.Json.JsonConvert.DeserializeObject（响应）
在这种情况下，可以将结果作为动态对象进行处理

定义并使用与您尝试反序列化的json格式相对应的类
您真正要做的是查询JSON。为此，可以使用DixonD建议的动态对象对其进行反序列化，然后遍历动态对象以找到所需的信息
另一个更简单、更简洁的解决方案是使用类似于XPath for JSON的库来查询JSON。有一个例子可以说明如何做这样的事情。
根据，您在问题中发布的JSON无效。但是，JSON在上是可以的，所以让我们继续吧
您需要的信息可以建模为包含两个字典的类：
public class rgInventoryItem
{
    public string id { get; set; }
    public string classid { get; set; }
}

public class rgDescription
{
    public string classid { get; set; }
    public string market_name { get; set; }
}

public class InventoryResponse
{
    public Dictionary<string, rgInventoryItem> rgInventory { get; set; }

    public Dictionary<string, rgDescription> rgDescriptions { get; set; }
}

要从classid创建市场名称，可以执行以下操作
    var classidToDescription = response.rgDescriptions.ToLookup(pair => pair.Value.classid);

这将找到给定classid
的所有rgDescription
类
如果您确定给定的classid
只有一个rgDescription
，则可以执行以下操作：
    var classidToDescriptionDictionary = response.rgDescriptions.ToDictionary(pair => pair.Value.classid);

请注意，如果多个描述具有相同的类id，则这将抛出一个带有消息“已添加具有相同密钥的项”的ArgumentException

更新
要从market\u name
转到id
，您需要反转字典并创建反向查找表。因此：
如果您需要回复中的所有市场名称，请执行以下操作：
    var marketNames = response.rgDescriptions.Values.Select(d => d.market_name);

    var ids = response.rgInventory.Keys;


如果您需要响应中的所有ID，请执行以下操作：
    var marketNames = response.rgDescriptions.Values.Select(d => d.market_name);

    var ids = response.rgInventory.Keys;


要从market\u name
映射到id
，首先创建反向查找：
    var classIdToId = response.rgInventory.ToLookup(pair => pair.Value.classid, pair => pair.Key);
    var marketNameToId = response.rgDescriptions
        .SelectMany(pair => classIdToId[pair.Value.classid].Select(id => new KeyValuePair<string, string>(pair.Value.market_name, id)))
        .ToLookup(pair => pair.Key, pair => pair.Value);

要获取引用给定市场名称的第一个id，请执行以下操作：
    var idsForMarket = marketNameToId[name].ToList();

    var firstIdForMarket = marketNameToId[name].FirstOrDefault();


更新2
以下是您的类的修改版本：
public class rgInventoryItem
{
    public string id { get; set; }
    public string classid { get; set; }
}

public class rgDescription
{
    public string classid { get; set; }
    public string market_name { get; set; }
}

public class CSGOInventory
{
    public static CSGOInventory FetchInventory(string steamId)
    {
        var url = "http://steamcommunity.com/profiles/" + steamId + "/inventory/json/730/2/";
        return FetchInventoryFromUrl(new Uri(url));
    }

    public static CSGOInventory FetchInventoryFromUrl(Uri url)
    {
        using (WebClient client = new WebClient())
        {
            string response = client.DownloadString(url);
            var inventory = JsonConvert.DeserializeObject<InventoryResponse>(response);
            return new CSGOInventory(inventory);
        }
    }

    readonly InventoryResponse inventory;
    readonly ILookup<string, string> classIdToId;
    readonly ILookup<string, string> marketNameToId;

    CSGOInventory(InventoryResponse inventory)
    {
        if (inventory == null)
            throw new ArgumentNullException();

        this.inventory = inventory;

        this.classIdToId = inventory.rgInventory.ToLookup(pair => pair.Value.classid, pair => pair.Key);
        this.marketNameToId = inventory.rgDescriptions
            .SelectMany(pair => classIdToId[pair.Value.classid].Select(id => new KeyValuePair<string, string>(pair.Value.market_name, id)))
            .ToLookup(pair => pair.Key, pair => pair.Value);
    }


    public IDictionary<string, rgInventoryItem> InventoryItems { get { return this.inventory == null ? null : this.inventory.rgInventory; } }

    public IDictionary<string, rgDescription> InventoryDescriptions { get { return this.inventory == null ? null : this.inventory.rgDescriptions; } }

    public IEnumerable<string> MarketNames { get { return InventoryDescriptions == null ? null : InventoryDescriptions.Values.Select(d => d.market_name); } }

    public IEnumerable<string> InventoryIds { get { return InventoryItems == null ? null : InventoryItems.Keys; } }

    public string getInstanceIdFromMarketName(string name)
    {
        return marketNameToId[name].FirstOrDefault();
    }

    public IEnumerable<string> getInstanceIdsFromMarketName(string name)
    {
        return marketNameToId[name];
    }

    class InventoryResponse
    {
        public Dictionary<string, rgInventoryItem> rgInventory { get; set; }

        public Dictionary<string, rgDescription> rgDescriptions { get; set; }
    }
}

给出输出
Market SG 553 | Army Sheen (Factory New)                 : id 1482735510
Market Offer | Music Kit | Noisia, Sharpened             : id 1468698711
Market Offer | Sticker | Bomb Squad (Foil)               : id 1468698710
Market Offer | Sticker | Dinked                          : id 1468698709
Market Offer | Sticker | Kawaii Killer CT                : id 1468698708
Market Operation Breakout Weapon Case                    : id 1462270322
Market Operation Vanguard Weapon Case                    : id 1459818809
Market M4A4 | Howl (Minimal Wear)                        : id 1450750270
Market Operation Phoenix Weapon Case                     : id 1391297747
Market Negev | Army Sheen (Minimal Wear)                 : id 1370560151
Market Huntsman Weapon Case                              : id 1305163655
Market Tec-9 | Army Mesh (Minimal Wear)                  : id 1304896559
Market Galil AR | Cerberus (Well-Worn)                   : id 1214784536
Market StatTrakT Tec-9 | Sandstorm (Field-Tested)        : id 1201208194
Market G3SG1 | Contractor (Field-Tested)                 : id 1189828757
Market Campaign Vanguard                                 : id 1103736871
Market Campaign Weapons Specialist                       : id 1103736870
Market Operation Vanguard Challenge Coin                 : id 1103736869
Market StatTrakT XM1014 | Red Python (Field-Tested)      : id 957595359
Market StatTrakT CZ75-Auto | Hexane (Field-Tested)       : id 814442137
Market Negev | Army Sheen (Factory New)                  : id 623936007
Market SSG 08 | Sand Dune (Well-Worn)                    : id 616381102
Market Silver Operation Breakout Coin                    : id 612997861
Market UMP-45 | Scorched (Field-Tested)                  : id 603041123

假设我使用您建议的第一种方法，那么我如何继续获得所需的功能？（在我的帖子顶部声明）既然有了市场名称，我就可以让classid有效地反向操作？你是说你想知道我是如何创建数据模型的，如何使用字段rgInventory
，或者如何使用response.rgDescriptions.ToLookup
的返回值？我这方面的问题很糟糕。我需要创建一个方法，该方法可以从market_Names获取rgInventory部分中的“id”。如果您想从market_name
转到id，那么？@JedBoffey-更新答案。这就是你需要的吗？
public class rgInventoryItem
{
    public string id { get; set; }
    public string classid { get; set; }
}

public class rgDescription
{
    public string classid { get; set; }
    public string market_name { get; set; }
}

public class CSGOInventory
{
    public static CSGOInventory FetchInventory(string steamId)
    {
        var url = "http://steamcommunity.com/profiles/" + steamId + "/inventory/json/730/2/";
        return FetchInventoryFromUrl(new Uri(url));
    }

    public static CSGOInventory FetchInventoryFromUrl(Uri url)
    {
        using (WebClient client = new WebClient())
        {
            string response = client.DownloadString(url);
            var inventory = JsonConvert.DeserializeObject<InventoryResponse>(response);
            return new CSGOInventory(inventory);
        }
    }

    readonly InventoryResponse inventory;
    readonly ILookup<string, string> classIdToId;
    readonly ILookup<string, string> marketNameToId;

    CSGOInventory(InventoryResponse inventory)
    {
        if (inventory == null)
            throw new ArgumentNullException();

        this.inventory = inventory;

        this.classIdToId = inventory.rgInventory.ToLookup(pair => pair.Value.classid, pair => pair.Key);
        this.marketNameToId = inventory.rgDescriptions
            .SelectMany(pair => classIdToId[pair.Value.classid].Select(id => new KeyValuePair<string, string>(pair.Value.market_name, id)))
            .ToLookup(pair => pair.Key, pair => pair.Value);
    }


    public IDictionary<string, rgInventoryItem> InventoryItems { get { return this.inventory == null ? null : this.inventory.rgInventory; } }

    public IDictionary<string, rgDescription> InventoryDescriptions { get { return this.inventory == null ? null : this.inventory.rgDescriptions; } }

    public IEnumerable<string> MarketNames { get { return InventoryDescriptions == null ? null : InventoryDescriptions.Values.Select(d => d.market_name); } }

    public IEnumerable<string> InventoryIds { get { return InventoryItems == null ? null : InventoryItems.Keys; } }

    public string getInstanceIdFromMarketName(string name)
    {
        return marketNameToId[name].FirstOrDefault();
    }

    public IEnumerable<string> getInstanceIdsFromMarketName(string name)
    {
        return marketNameToId[name];
    }

    class InventoryResponse
    {
        public Dictionary<string, rgInventoryItem> rgInventory { get; set; }

        public Dictionary<string, rgDescription> rgDescriptions { get; set; }
    }
}

public static class TestClass
{
    public static void Test()
    {
        //string url = @"d:\temp\question28328432.json";
        string url = @"http://steamcommunity.com/id/Mambocsgoshack/inventory/json/730/2/";
        var inventory = CSGOInventory.FetchInventoryFromUrl(new Uri(url));
        foreach (var market in inventory.MarketNames)
        {
            Console.WriteLine(string.Format("    Market {0,-50}: id {1}", market, inventory.getInstanceIdFromMarketName(market)));
        }
    }
}

Market SG 553 | Army Sheen (Factory New)                 : id 1482735510
Market Offer | Music Kit | Noisia, Sharpened             : id 1468698711
Market Offer | Sticker | Bomb Squad (Foil)               : id 1468698710
Market Offer | Sticker | Dinked                          : id 1468698709
Market Offer | Sticker | Kawaii Killer CT                : id 1468698708
Market Operation Breakout Weapon Case                    : id 1462270322
Market Operation Vanguard Weapon Case                    : id 1459818809
Market M4A4 | Howl (Minimal Wear)                        : id 1450750270
Market Operation Phoenix Weapon Case                     : id 1391297747
Market Negev | Army Sheen (Minimal Wear)                 : id 1370560151
Market Huntsman Weapon Case                              : id 1305163655
Market Tec-9 | Army Mesh (Minimal Wear)                  : id 1304896559
Market Galil AR | Cerberus (Well-Worn)                   : id 1214784536
Market StatTrakT Tec-9 | Sandstorm (Field-Tested)        : id 1201208194
Market G3SG1 | Contractor (Field-Tested)                 : id 1189828757
Market Campaign Vanguard                                 : id 1103736871
Market Campaign Weapons Specialist                       : id 1103736870
Market Operation Vanguard Challenge Coin                 : id 1103736869
Market StatTrakT XM1014 | Red Python (Field-Tested)      : id 957595359
Market StatTrakT CZ75-Auto | Hexane (Field-Tested)       : id 814442137
Market Negev | Army Sheen (Factory New)                  : id 623936007
Market SSG 08 | Sand Dune (Well-Worn)                    : id 616381102
Market Silver Operation Breakout Coin                    : id 612997861
Market UMP-45 | Scorched (Field-Tested)                  : id 603041123