Json.NET:反序列化json数组

Question

Json.NET:反序列化json数组

我正在尝试使用Json.NET处理JSON结构并遇到一些问题:

当JSON包含未命名的数组时,我的类不起作用.

Json示例:

{
    "graph_property" : [{
            "name" : "calculation_method",
            "value" : "Arithmetic"
        }, {
            "name" : "graph_type",
            "value" : "TIME"
        }
    ],
    "measurement" : [{
            "id" : "9997666",
            "alias" : "Measurement (TxP)[IE]-Home Page - Total Time (seconds)",
            "bucket_data" : [{
                    "name" : "2013-MAR-18 12:00 AM",
                    "id" : 1,
                    "perf_data" : {
                        "value" : "2.244",
                        "unit" : "seconds"
                    },
                    "avail_data" : {
                        "value" : "99.67",
                        "unit" : "percent"
                    },
                    "data_count" : {
                        "value" : "299",
                        "unit" : "#"
                    }
                }
            ],
            "graph_option" : [{
                    "name" : "perfwarning",
                    "value" : "-",
                    "unit" : "seconds"
                }, {
                    "name" : "perfcritical",
                    "value" : "-",
                    "unit" : "seconds"
                }, {
                    "name" : "availwarning",
                    "value" : "-",
                    "unit" : "percent"
                }, {
                    "name" : "availcritical",
                    "value" : "-",
                    "unit" : "percent"
                }, {
                    "name" : "bucketsize",
                    "value" : "86400",
                    "unit" : "seconds"
                }, {
                    "name" : "rows",
                    "value" : "1",
                    "unit" : "#"
                }, {
                    "name" : "pagecomponent",
                    "value" : "Total Time",
                    "unit" : "seconds"
                }, {
                    "name" : "avg_perf",
                    "value" : "2.244",
                    "unit" : "seconds"
                }, {
                    "name" : "avg_avail",
                    "value" : "99.67",
                    "unit" : "percent"
                }, {
                    "name" : "total_datapoint_count",
                    "value" : "300",
                    "unit" : "#"
                }, {}

            ]
        }, {
            "id" : "9997666",
            "alias" : "Measurement (TxP)[IE]-Women - Total Time (seconds)",
            "bucket_data" : [{
                    "name" : "2013-MAR-18 12:00 AM",
                    "id" : 1,
                    "perf_data" : {
                        "value" : "0.979",
                        "unit" : "seconds"
                    },
                    "avail_data" : {
                        "value" : "100.00",
                        "unit" : "percent"
                    },
                    "data_count" : {
                        "value" : "299",
                        "unit" : "#"
                    }
                }
            ],
            "graph_option" : [{
                    "name" : "perfwarning",
                    "value" : "-",
                    "unit" : "seconds"
                }, {
                    "name" : "perfcritical",
                    "value" : "-",
                    "unit" : "seconds"
                }, {
                    "name" : "availwarning",
                    "value" : "-",
                    "unit" : "percent"
                }, {
                    "name" : "availcritical",
                    "value" : "-",
                    "unit" : "percent"
                }, {
                    "name" : "bucketsize",
                    "value" : "86400",
                    "unit" : "seconds"
                }, {
                    "name" : "rows",
                    "value" : "1",
                    "unit" : "#"
                }, {
                    "name" : "pagecomponent",
                    "value" : "Total Time",
                    "unit" : "seconds"
                }, {
                    "name" : "avg_perf",
                    "value" : "0.979",
                    "unit" : "seconds"
                }, {
                    "name" : "avg_avail",
                    "value" : "100.00",
                    "unit" : "percent"
                }, {
                    "name" : "total_datapoint_count",
                    "value" : "299",
                    "unit" : "#"
                }, {}

            ]
        }
    ],
    "link" : {
        "type" : "application/json",
        "href" : "http://api.website.tld?format=json",
        "rel" : "slotmetadata"
    }
}

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Json.NET类:

using System;
using System.Collections.Generic;

namespace CAKR.Graph
{
    /// <summary>
    /// Description of KN_Graph.
    /// </summary>
    public class GraphProperty
    {
        public string name { get; set; }
        public string value { get; set; }
    }

    public class PerfData
    {
        public string value { get; set; }
        public string unit { get; set; }
    }

    public class AvailData
    {
        public string value { get; set; }
        public string unit { get; set; }
    }

    public class DataCount
    {
        public string value { get; set; }
        public string unit { get; set; }
    }

    public class BucketData
    {
        public string name { get; set; }
        public int id { get; set; }
        public PerfData perf_data { get; set; }
        public AvailData avail_data { get; set; }
        public DataCount data_count { get; set; }
    }

    public class GraphOption
    {
        public string name { get; set; }
        public string value { get; set; }
        public string unit { get; set; }
    }

    public class Measurement
    {
        public string id { get; set; }
        public string alias { get; set; }
        public List<BucketData> bucket_data { get; set; }
        public List<GraphOption> graph_option { get; set; }
    }

    public class Link
    {
        public string type { get; set; }
        public string href { get; set; }
        public string rel { get; set; }
    }

    public class RootObject
    {
        public List<GraphProperty> graph_property { get; set; }
        public List<Measurement> measurement { get; set; }
        public Link link { get; set; }
    }
}

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我的代码:

var myObject = JsonConvert.DeserializeObject<CAKR.Graph.Measurement>(MyJsonString);

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我不确定为什么我没有得到包含"Measurment"子数组数据的对象.如果我插入命名值,它的工作原理......

Answer 1

小智 9

所以我在相当长的一段时间内努力让这个工作.然而,最终解决方案并不那么困难.希望通过我的回复,我会帮助一些人.

在我的案例中的解决方案是

使用nu.get将JSON.net安装到您的项目中
使你的JSON对象包括数组中的数组等.确保对象的格式是正确的!例...

{"产品明细":[

  {
      "ProjectImg"    : "http://placehold.it/400x300",
      "Category"      : "Cars",
      "ProjectTitle"  : "Cars of the future",
      "ProjectDesc"   : "Test project",
      "GenSpecList"   : ["Specs1", "Specs2", "Specs3", "Specs4"],
      "OptionList"    : [{    "OptionNr"  : "1",
                              "Options"   : ["Opt1", "Opt2", "Opt3"]
                          },
                          {   "OptionNr"  : "2",
                              "Options"   : ["Opt1", "Opt2", "Opt3"]
                          },
                          {   "OptionNr"  : "3",
                              "Options"   : ["Opt1", "Opt2", "Opt3"]
                          },
                          {   "OptionNr"  : "4",
                              "Options"   : ["Opt1", "Opt2", "Opt3"]
                          },
                          {   "OptionNr"  : "5",
                              "Options"   : ["Opt1", "Opt2", "Opt3"]
                          },
                          {   "OptionNr"  : "6",
                              "Options"   : ["Opt1", "Opt2", "Opt3"]
                          }
                        ],
      "Articles"      : [{    "tileImg" : "'Images/Project/1.jpg'",
                              "tileTit" : "Title1",
                              "tileArt" : "Article text here..."
                          },
                          {
                              "tileImg" : "'Images/Project/2.jpg'",
                              "tileTit" : "Title2",
                              "tileArt" : "Article text here..."
                          },
                          {
                              "tileImg" : "'Images/Project/3.jpg'",
                              "tileTit" : "Title3",
                              "tileArt" : "Article text here..."
                          },
                          {
                              "tileImg" : "'Images/Project/4.jpg'",
                              "tileTit"   : "Title4",
                              "tileArt"   : "Article text here..."
                          }
                         ]
  }
]
}

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转到json2csharp.com并将您的JSON对象复制到输入框中,然后单击generate按钮.复制生成到ViewModel中的csharp模型(这实际上是解决我的斗争的关键!).

在我的例子中,json2csharp.com生成的所有类的主要类是RootObject,如下所示

public class Article
{
    public string tileImg { get; set; }
    public string tileTit { get; set; }
    public string tileArt { get; set; }
}

public class OptionList
{
    public string OptionNr { get; set; }
    public List<string> Options { get; set; }
}

public class ProductDetail
{
    public string ProjectImg { get; set; }
    public string Category { get; set; }
    public string ProjectTitle { get; set; }
    public string ProjectDesc { get; set; }
    public List<string> GenSpecList { get; set; }
    public List<OptionList> OptionList { get; set; }
    public List<Article> Articles { get; set; }
}

public class RootObject
{
    public List<ProductDetail> ProductDetail { get; set; }
}

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然后在控制器中使用以下代码(这里只复制了完整的文件)

using Project.Details; //<-- this is my ViewModel namespace name
using Newtonsoft.Json;
using System.IO;
using System.Threading.Tasks;

namespace WebApplication.Controllers
{
    public class JSONController : Controller
    {
        //
        // GET: /JSON/
        public async Task<ActionResult> Index()
        {
            StreamReader file = new StreamReader("C:\\Users\\YourName\\etc\\File.json");
            String json = await file.ReadToEndAsync();

            var Project = JsonConvert.DeserializeObject<RootObject>(json);

            return View();
        }
    }
}

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现在一切都应该工作正常,数组中的数组等等.希望你发现我的解决方案很有帮助,请注意我不是一个顽固的程序员,所以如果我错过效率方面的东西,我希望收到一些提示来改进这些代码......

最好的问候,雷蒙德

Answer 2

Jev*_*sov 2

首先，您实际上并不需要Measurement完全按照MyJsonString. 您可以使用JsonProperty属性并装饰您的类属性。

另一件事是，如果您想反序列化您的部分内容MyJsonString并仅提取的数组Measurement，您应该为Deserialize方法提供正确的 T 类型（在您的情况下，它是IEnumerable<Measurement>.

以下代码应该有所帮助：

    dynamic context = JObject.Parse(MyJsonString);
    var myObject = JsonConvert.DeserializeObject<IEnumerable<Measurement>>(context.measurement.ToString());

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