Question

我有像这样的JSON结果

{
   "authenticationResultCode":"ValidCredentials",
   "brandLogoUri":"http:\/\/dev.virtualearth.net\/Branding\/logo_powered_by.png",
   "copyright":"Copyright © 2011 Microsoft and its suppliers. All rights reserved. This API cannot be accessed and the content and any results may not be used, reproduced or transmitted in any manner without express written permission from Microsoft Corporation.",
   "resourceSets":[
      {
         "estimatedTotal":1,
         "resources":[
            {
               "__type":"Location:http:\/\/schemas.microsoft.com\/search\/local\/ws\/rest\/v1",
               "bbox":[
                  47.636257744012461,
                  -122.13735364288299,
                  47.643983179153814,
                  -122.12206713944467
               ],
               "name":"1 Microsoft Way, Redmond, WA 98052",
               "point":{
                  "type":"Point",
                  "coordinates":[
                     47.640120461583138,
                     -122.12971039116383
                  ]
               },
               "address":{
                  "addressLine":"1 Microsoft Way",
                  "adminDistrict":"WA",
                  "adminDistrict2":"King Co.",
                  "countryRegion":"United States",
                  "formattedAddress":"1 Microsoft Way, Redmond, WA 98052",
                  "locality":"Redmond",
                  "postalCode":"98052"
               },
               "confidence":"High",
               "entityType":"Address",
               "geocodePoints":[
                  {
                     "type":"Point",
                     "coordinates":[
                        47.640120461583138,
                        -122.12971039116383
                     ],
                     "calculationMethod":"InterpolationOffset",
                     "usageTypes":[
                        "Display"
                     ]
                  },
                  {
                     "type":"Point",
                     "coordinates":[
                        47.640144601464272,
                        -122.12976671755314
                     ],
                     "calculationMethod":"Interpolation",
                     "usageTypes":[
                        "Route"
                     ]
                  }
               ],
               "matchCodes":[
                  "Good"
               ]
            }
         ]
      }
   ],
   "statusCode":200,
   "statusDescription":"OK",
   "traceId":"b0b1286504404eafa7e7dad3e749d570"
}

我想得到一个对象列表，每个对象都包含坐标值

那么如何通过名称访问这些元素呢？

我使用C＃作为代码。

Answer 1

您可以使用Json.NET这样的包来完成此任务。

很容易通过从http://json2csharp.com/

提供json字符串来生成类

然后您可以访问项目的属性，如下所示

RootObject obj = JsonConvert.DeserializeObject<RootObject>(jsonText);

下面的

是从json2csharp为给定的json

生成的类

public class Point
{
    public string type { get; set; }
    public List<double> coordinates { get; set; }
}

public class Address
{
    public string addressLine { get; set; }
    public string adminDistrict { get; set; }
    public string adminDistrict2 { get; set; }
    public string countryRegion { get; set; }
    public string formattedAddress { get; set; }
    public string locality { get; set; }
    public string postalCode { get; set; }
}

public class GeocodePoint
{
    public string type { get; set; }
    public List<double> coordinates { get; set; }
    public string calculationMethod { get; set; }
    public List<string> usageTypes { get; set; }
}

public class Resource
{
    public string __type { get; set; }
    public List<double> bbox { get; set; }
    public string name { get; set; }
    public Point point { get; set; }
    public Address address { get; set; }
    public string confidence { get; set; }
    public string entityType { get; set; }
    public List<GeocodePoint> geocodePoints { get; set; }
    public List<string> matchCodes { get; set; }
}

public class ResourceSet
{
    public int estimatedTotal { get; set; }
    public List<Resource> resources { get; set; }
}

public class RootObject
{
    public string authenticationResultCode { get; set; }
    public string brandLogoUri { get; set; }
    public string copyright { get; set; }
    public List<ResourceSet> resourceSets { get; set; }
    public int statusCode { get; set; }
    public string statusDescription { get; set; }
    public string traceId { get; set; }
}

Answer 2

由于您似乎已经在使用DataContractJsonSerializer，因此请坚持下去。反序列化json的最佳方法是首先定义一个捕获相关数据的模型，例如

public class JsonModel
{
    public int StatusCode { get; set; }
    public string StatusDescription { get; set; }
    public string TraceId { get; set; }
    ...
}

接下来，装饰模型，使其适合反序列化

[DataContract]
public class JsonModel
{
    [DataMember(Name = "statusCode")]
    public int StatusCode { get; set; }
    [DataMember(Name = "statusDescription")]
    public string StatusDescription { get; set; }
    [DataMember(Name = "traceId")]
    public string TraceId { get; set; }
    ...
}

最后，执行反序列化

using (var memoryStream = new MemoryStream(Encoding.Unicode.GetBytes(jsonData))) 
{    
    var serializer = new DataContractJsonSerializer(typeof(JsonModel));
    var model = (JsonModel) serializer.ReadObject(memoryStream);  
    Console.WriteLine(model.StatusCode);
}

那么如何通过名称访问这些元素呢？

反序列化的另一个选项是让你能够通过名称引用属性，例如使用dynamic对象。

var model = new JavaScriptSerializer().Deserialize<dynamic>(jsonData);
Console.WriteLine(model["statusCode"]);

Answer 3

将以下网址中的所有Bing Maps REST服务的类添加到您的项目中：

JSON Data Contracts

然后，确保添加using指令：

using BingMapsRESTService.Common.JSON;

并按如下方式读取字符串（其中stream是json的流）：

var d = new DataContractJsonSerializer(typeof(Response));
var o = d.ReadObject(stream);

使用C＃访问JSON文件中的元素

3 个答案: