使用 C#：如何使用 Newtonsoft.JSON 遍历嵌套的 JSON？答案

【问题标题】：Working with C#: How do I iterate through a nested JSON using Newtonsoft.JSON?使用 C#：如何使用 Newtonsoft.JSON 遍历嵌套的 JSON？
【发布时间】：2017-08-01 04:44:11
【问题描述】：

我正在为项目提取大量 JSON 数据。每个项目都有一组我想要抓取并放在列表中的特定数据。

这是 JSON 数据中包含的 700 多个项目中的两个的示例。我需要能够使用 Newtonsoft.JSON 遍历 JSON 数据，并在“fieldName”的“items”、“values”、“value”中提取数据：“Item ID”。我需要对 JSON 数据中返回的所有 700 个项目执行此操作。如何遍历这些数据并仅访问该特定数据？

{
items: [    
    {
      "createDate": 1468872878834,
      "updateDate": 1498075185297,
      "deleted": 0,
      "allListsItemCount": 0,
      "assets": [
        {
          "createDate": 1469129652323,
          "updateDate": 1471625094427,
          "deleted": 0,
          "url": "A_O_Smith_SQ1032_lg.jpg",
          "parentId": 10270308,
          "typeId": 4000014573,
          "filename": "A_O_Smith_SQ1032_lg.jpg",
          "seqOrder": 1,
          "printActive": 1,
          "webActive": 1,
          "thumbnail": 1,
          "flag1": 1,
          "typeName": "Web Thumbnail Image",
          "typeGroupCode": "PRIM",
          "id": 4063212155,
          "transformationSource": false,
          "primaryAsset": false
        },
        {
          "createDate": 1469129652323,
          "updateDate": 1471625094427,
          "deleted": 0,
          "url": "A_O_Smith_SQ1032.tif",
          "parentId": 10270308,
          "typeId": 4000014572,
          "filename": "A_O_Smith_SQ1032.tif",
          "seqOrder": 2,
          "printActive": 1,
          "webActive": 0,
          "typeName": "Print Image",
          "typeGroupCode": "PRIM",
          "id": 4063212156,
          "transformationSource": false,
          "primaryAsset": false
        }
      ],
      "masterCategoryId": 4000593879,
      "listsCount": 0,
      "advTablesCount": 0,
      "id": 10270308,
      "values": [
        {
          "languageId": 1,
          "fieldId": 20002078,
          "fieldName": "Amps",
          "value": "19.20/9.60"
        },
        {
          "languageId": 1,
          "fieldId": 20000921,
          "fieldKey": "Item_ID",
          "fieldName": "Item ID",
          "value": "USQ1152"
        },
        {
          "languageId": 1,
          "fieldId": 20002075,
          "fieldKey": "Inv_Mast_UID",
          "fieldName": "Inv_Mast_UID",
          "value": "6736"
        },
        {
          "languageId": 1,
          "fieldId": 20002081,
          "fieldName": "Bearings",
          "value": "Sealed Ball"
        },
        {
          "languageId": 1,
          "fieldId": 20002141,
          "fieldKey": "Web_Description",
          "fieldName": "Web&UPC Description",
          "value": "CENTURY MOTOR                     NS"
        },
        {
          "languageId": 1,
          "fieldId": 20002190,
          "fieldKey": "Web_Image",
          "fieldName": "Image Name LR",
          "value": "A_O_Smith_SQ1032_lg"
        },
        {
          "languageId": 1,
          "fieldId": 20002191,
          "fieldName": "Image Name HR",
          "value": "A_O_Smith_SQ1032"
        },
        {
          "languageId": 1,
          "fieldId": 20002089,
          "fieldName": "Features",
          "value": "Used on many Sta-Rite - Red Jacket, Pac Fab & American pprojets and Sears jet and pool pumps,High & low service factors, 303 Stainless steel threaded shaft, 50 Degrees C ambient, Capacitor sart"
        },
        {
          "languageId": 1,
          "fieldId": 20002088,
          "fieldName": "Enclosure",
          "value": "Open Drip Proof"
        },
        {
          "languageId": 1,
          "fieldId": 20002091,
          "fieldName": "Frame"
        },
        {
          "languageId": 1,
          "fieldId": 20002092,
          "fieldName": "H.P.",
          "value": "1-1/2"
        },
        {
          "languageId": 1,
          "fieldId": 20002093,
          "fieldName": "Hertz",
          "value": "60"
        },
        {
          "languageId": 1,
          "fieldId": 20002524,
          "fieldName": "Mounting Option",
          "value": "Square Flange"
        },
        {
          "languageId": 1,
          "fieldId": 20002104,
          "fieldName": "Overload",
          "value": "Automatic"
        },
        {
          "languageId": 1,
          "fieldId": 20002105,
          "fieldName": "Phase",
          "value": "Single"
        },
        {
          "languageId": 1,
          "fieldId": 20002109,
          "fieldName": "RPM",
          "value": "3450"
        },
        {
          "languageId": 1,
          "fieldId": 20002110,
          "fieldName": "Service Factor",
          "value": "1.1"
        },
        {
          "languageId": 1,
          "fieldId": 20002112,
          "fieldName": "Speeds",
          "value": "Single"
        },
        {
          "languageId": 1,
          "fieldId": 20002114,
          "fieldName": "Voltage",
          "value": "115/230"
        },
        {
          "languageId": 1,
          "fieldId": 20002108,
          "fieldName": "Rotation",
          "value": "CCW Pump End"
        }
      ],
      "number": "USQ1152",
      "type": "item",
      "statusId": 4000004050
    },
    {
      "createDate": 1468872878845,
      "updateDate": 1495111010291,
      "deleted": 0,
      "allListsItemCount": 0,
      "assets": [
        {
          "createDate": 1469129652335,
          "updateDate": 1471625094427,
          "deleted": 0,
          "url": "A_O_Smith_SQ1032_lg.jpg",
          "parentId": 10270309,
          "typeId": 4000014573,
          "filename": "A_O_Smith_SQ1032_lg.jpg",
          "seqOrder": 1,
          "printActive": 1,
          "webActive": 1,
          "thumbnail": 1,
          "flag1": 1,
          "typeName": "Web Thumbnail Image",
          "typeGroupCode": "PRIM",
          "id": 4063212157,
          "transformationSource": false,
          "primaryAsset": false
        },
        {
          "createDate": 1469129652335,
          "updateDate": 1471625094427,
          "deleted": 0,
          "url": "A_O_Smith_SQ1032.tif",
          "parentId": 10270309,
          "typeId": 4000014572,
          "filename": "A_O_Smith_SQ1032.tif",
          "seqOrder": 2,
          "printActive": 1,
          "webActive": 0,
          "typeName": "Print Image",
          "typeGroupCode": "PRIM",
          "id": 4063212158,
          "transformationSource": false,
          "primaryAsset": false
        }
      ],
      "masterCategoryId": 4000593879,
      "listsCount": 0,
      "advTablesCount": 0,
      "id": 10270309,
      "values": [
        {
          "languageId": 1,
          "fieldId": 20002078,
          "fieldName": "Amps",
          "value": "10.4"
        },
        {
          "languageId": 1,
          "fieldId": 20000921,
          "fieldKey": "Item_ID",
          "fieldName": "Item ID",
          "value": "USQ1202"
        },
        {
          "languageId": 1,
          "fieldId": 20002075,
          "fieldKey": "Inv_Mast_UID",
          "fieldName": "Inv_Mast_UID",
          "value": "6737"
        },
        {
          "languageId": 1,
          "fieldId": 20002141,
          "fieldKey": "Web_Description",
          "fieldName": "Web&UPC Description",
          "value": "CENTURY MOTOR                     NS"
        },
        {
          "languageId": 1,
          "fieldId": 20002190,
          "fieldKey": "Web_Image",
          "fieldName": "Image Name LR",
          "value": "A_O_Smith_SQ1032_lg"
        },
        {
          "languageId": 1,
          "fieldId": 20002191,
          "fieldName": "Image Name HR",
          "value": "A_O_Smith_SQ1032"
        },
        {
          "languageId": 1,
          "fieldId": 20002089,
          "fieldName": "Features",
          "value": "Used on many Sta-Rite - Red Jacket, Pac Fab & American pprojets and Sears jet and pool pumps,High & low service factors, 303 Stainless steel threaded shaft, 50 Degrees C ambient, Capacitor sart"
        },
        {
          "languageId": 1,
          "fieldId": 20002102,
          "fieldName": "Notes",
          "value": "199"
        },
        {
          "languageId": 1,
          "fieldId": 20002088,
          "fieldName": "Enclosure",
          "value": "Open Drip Proof"
        },
        {
          "languageId": 1,
          "fieldId": 20002091,
          "fieldName": "Frame"
        },
        {
          "languageId": 1,
          "fieldId": 20002092,
          "fieldName": "H.P.",
          "value": "2"
        },
        {
          "languageId": 1,
          "fieldId": 20002093,
          "fieldName": "Hertz",
          "value": "60"
        },
        {
          "languageId": 1,
          "fieldId": 20002524,
          "fieldName": "Mounting Option",
          "value": "NEMA 56C Face"
        },
        {
          "languageId": 1,
          "fieldId": 20002104,
          "fieldName": "Overload",
          "value": "Automatic"
        },
        {
          "languageId": 1,
          "fieldId": 20002105,
          "fieldName": "Phase",
          "value": "Single"
        },
        {
          "languageId": 1,
          "fieldId": 20002109,
          "fieldName": "RPM",
          "value": "3450"
        },
        {
          "languageId": 1,
          "fieldId": 20002110,
          "fieldName": "Service Factor",
          "value": "1.1"
        },
        {
          "languageId": 1,
          "fieldId": 20002112,
          "fieldName": "Speeds",
          "value": "Single"
        },
        {
          "languageId": 1,
          "fieldId": 20002114,
          "fieldName": "Voltage",
          "value": "230"
        },
        {
          "languageId": 1,
          "fieldId": 20002108,
          "fieldName": "Rotation",
          "value": "CCWPE-Not Reversible"
        }
      ],
      "number": "USQ1202",
      "type": "item",
      "statusId": 4000004050
    }
]

}

这是我开始的：

string itemJson = await response.Content.ReadAsStringAsync();
JObject rss = JObject.Parse(itemJson);

【问题讨论】：

标签： c# json

【解决方案1】：

以下是hacky但有效：

using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

public class Program
{
    public static void Main()
    {
        string itemJson = @"{'items':[{'createDate':1468872878834,'updateDate':1498075185297,'deleted':0,'allListsItemCount':0,'assets':[{'createDate':1469129652323,'updateDate':1471625094427,'deleted':0,'url':'A_O_Smith_SQ1032_lg.jpg','parentId':10270308,'typeId':4000014573,'filename':'A_O_Smith_SQ1032_lg.jpg','seqOrder':1,'printActive':1,'webActive':1,'thumbnail':1,'flag1':1,'typeName':'Web Thumbnail Image','typeGroupCode':'PRIM','id':4063212155,'transformationSource':false,'primaryAsset':false},{'createDate':1469129652323,'updateDate':1471625094427,'deleted':0,'url':'A_O_Smith_SQ1032.tif','parentId':10270308,'typeId':4000014572,'filename':'A_O_Smith_SQ1032.tif','seqOrder':2,'printActive':1,'webActive':0,'typeName':'Print Image','typeGroupCode':'PRIM','id':4063212156,'transformationSource':false,'primaryAsset':false}],'masterCategoryId':4000593879,'listsCount':0,'advTablesCount':0,'id':10270308,'values':[{'languageId':1,'fieldId':20002078,'fieldName':'Amps','value':'19.20/9.60'},{'languageId':1,'fieldId':20000921,'fieldKey':'Item_ID','fieldName':'Item ID','value':'USQ1152'},{'languageId':1,'fieldId':20002075,'fieldKey':'Inv_Mast_UID','fieldName':'Inv_Mast_UID','value':'6736'},{'languageId':1,'fieldId':20002081,'fieldName':'Bearings','value':'Sealed Ball'},{'languageId':1,'fieldId':20002141,'fieldKey':'Web_Description','fieldName':'Web&UPC Description','value':'CENTURY MOTOR                     NS'},{'languageId':1,'fieldId':20002190,'fieldKey':'Web_Image','fieldName':'Image Name LR','value':'A_O_Smith_SQ1032_lg'},{'languageId':1,'fieldId':20002191,'fieldName':'Image Name HR','value':'A_O_Smith_SQ1032'},{'languageId':1,'fieldId':20002089,'fieldName':'Features','value':'Used on many Sta-Rite - Red Jacket, Pac Fab & American pprojets and Sears jet and pool pumps,High & low service factors, 303 Stainless steel threaded shaft, 50 Degrees C ambient, Capacitor sart'},{'languageId':1,'fieldId':20002088,'fieldName':'Enclosure','value':'Open Drip Proof'},{'languageId':1,'fieldId':20002091,'fieldName':'Frame'},{'languageId':1,'fieldId':20002092,'fieldName':'H.P.','value':'1-1/2'},{'languageId':1,'fieldId':20002093,'fieldName':'Hertz','value':'60'},{'languageId':1,'fieldId':20002524,'fieldName':'Mounting Option','value':'Square Flange'},{'languageId':1,'fieldId':20002104,'fieldName':'Overload','value':'Automatic'},{'languageId':1,'fieldId':20002105,'fieldName':'Phase','value':'Single'},{'languageId':1,'fieldId':20002109,'fieldName':'RPM','value':'3450'},{'languageId':1,'fieldId':20002110,'fieldName':'Service Factor','value':'1.1'},{'languageId':1,'fieldId':20002112,'fieldName':'Speeds','value':'Single'},{'languageId':1,'fieldId':20002114,'fieldName':'Voltage','value':'115/230'},{'languageId':1,'fieldId':20002108,'fieldName':'Rotation','value':'CCW Pump End'}],'number':'USQ1152','type':'item','statusId':4000004050},{'createDate':1468872878845,'updateDate':1495111010291,'deleted':0,'allListsItemCount':0,'assets':[{'createDate':1469129652335,'updateDate':1471625094427,'deleted':0,'url':'A_O_Smith_SQ1032_lg.jpg','parentId':10270309,'typeId':4000014573,'filename':'A_O_Smith_SQ1032_lg.jpg','seqOrder':1,'printActive':1,'webActive':1,'thumbnail':1,'flag1':1,'typeName':'Web Thumbnail Image','typeGroupCode':'PRIM','id':4063212157,'transformationSource':false,'primaryAsset':false},{'createDate':1469129652335,'updateDate':1471625094427,'deleted':0,'url':'A_O_Smith_SQ1032.tif','parentId':10270309,'typeId':4000014572,'filename':'A_O_Smith_SQ1032.tif','seqOrder':2,'printActive':1,'webActive':0,'typeName':'Print Image','typeGroupCode':'PRIM','id':4063212158,'transformationSource':false,'primaryAsset':false}],'masterCategoryId':4000593879,'listsCount':0,'advTablesCount':0,'id':10270309,'values':[{'languageId':1,'fieldId':20002078,'fieldName':'Amps','value':'10.4'},{'languageId':1,'fieldId':20000921,'fieldKey':'Item_ID','fieldName':'Item ID','value':'USQ1202'},{'languageId':1,'fieldId':20002075,'fieldKey':'Inv_Mast_UID','fieldName':'Inv_Mast_UID','value':'6737'},{'languageId':1,'fieldId':20002141,'fieldKey':'Web_Description','fieldName':'Web&UPC Description','value':'CENTURY MOTOR                     NS'},{'languageId':1,'fieldId':20002190,'fieldKey':'Web_Image','fieldName':'Image Name LR','value':'A_O_Smith_SQ1032_lg'},{'languageId':1,'fieldId':20002191,'fieldName':'Image Name HR','value':'A_O_Smith_SQ1032'},{'languageId':1,'fieldId':20002089,'fieldName':'Features','value':'Used on many Sta-Rite - Red Jacket, Pac Fab & American pprojets and Sears jet and pool pumps,High & low service factors, 303 Stainless steel threaded shaft, 50 Degrees C ambient, Capacitor sart'},{'languageId':1,'fieldId':20002102,'fieldName':'Notes','value':'199'},{'languageId':1,'fieldId':20002088,'fieldName':'Enclosure','value':'Open Drip Proof'},{'languageId':1,'fieldId':20002091,'fieldName':'Frame'},{'languageId':1,'fieldId':20002092,'fieldName':'H.P.','value':'2'},{'languageId':1,'fieldId':20002093,'fieldName':'Hertz','value':'60'},{'languageId':1,'fieldId':20002524,'fieldName':'Mounting Option','value':'NEMA 56C Face'},{'languageId':1,'fieldId':20002104,'fieldName':'Overload','value':'Automatic'},{'languageId':1,'fieldId':20002105,'fieldName':'Phase','value':'Single'},{'languageId':1,'fieldId':20002109,'fieldName':'RPM','value':'3450'},{'languageId':1,'fieldId':20002110,'fieldName':'Service Factor','value':'1.1'},{'languageId':1,'fieldId':20002112,'fieldName':'Speeds','value':'Single'},{'languageId':1,'fieldId':20002114,'fieldName':'Voltage','value':'230'},{'languageId':1,'fieldId':20002108,'fieldName':'Rotation','value':'CCWPE-Not Reversible'}],'number':'USQ1202','type':'item','statusId':4000004050}]}";
        dynamic rss = JObject.Parse(itemJson);
        dynamic items = rss.items;
        foreach (dynamic item in items)
        {
            dynamic values = item.values;
            foreach (dynamic val in values)
            {
                //Console.WriteLine(val);
                if (val.fieldName == "Item ID")
                {
                    Console.WriteLine(val.value);
                }
            }
        }
    }
}

【讨论】：

谢谢。而其他解决方案也非常好。这个解决方案让我深入了解了如何准确地处理复杂的嵌套 JSON。

【解决方案2】：

这样的？

foreach (var item in items)
{
    Console.WriteLine("{0}", item.id);
    foreach (var val in item.values)
    {
        Console.WriteLine("{0}", val.fieldName);
    }
}

【讨论】：

【解决方案3】：

一种方法是使用 http://json2csharp.com/ 从您的 json 生成类。

一旦有了类，就可以将它们添加到项目中并使用 JSON.net 反序列化整个结构。一旦你将 json 反序列化为 c# POCO 之类的

var  yourObject = JsonConvert.DeserializeObject<'your c# wrapper class'>(<your json>);

您可以使用 Linq 来查询对象。

【讨论】：