1

我最难反序列化一个 json 字符串。

我使用的是 RestSharp api，如果我在请求中指定了 RootElement，它会很好用。然后我转移到 Hammock 以获取 OAuth 功能，但反序列化并不那么容易。

我试过使用 DataContractJsonSerializer

DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(List)); var member = (List)ser.ReadObject(response.ContentStream);

但这给了我一个 InvalidCastException。

我试过 JsonConvert

var members = JsonConvert.DeserializeObject<List<Member>>(response.Content);

但我得到了例外：无法将 JSON 对象反序列化为“System.Collections.Generic.List`1[Member]”类型。

RestSharp 在调用 ExecuteAsync 时轻松解决了这个问题。 Client.ExecuteAsync<List<Member>>(request, (response) =>

我无计可施。也许我需要一个等同于 RestSharp 的 RootElement 属性的吊床？ 只是我的Json很难转换吗？

这是我的会员对象

public partial class Member 
{
    public string State { get; set; }
    public string Joined { get; set; }
    public string lat { get; set; }
    public string Zip { get; set; }
    public string Bio { get; set; }
    public string Name { get; set; }
    public string City { get; set; }
    public string Id { get; set; }
    public string Link { get; set; }
    public string Country { get; set; }
    public string Visited { get; set; }
    public string Photo_url { get; set; }
    public string lon { get; set; }
}

这是Json：

{
    "results": [
        {
            "zip": "11111",
            "lon": "-122.22000122070312",
            "photo_url": "http: //photos1.aaaaa.com/photos/member/1/6/c/e/member_4469838.jpeg",
            "link": "http: //www.aaaa.com/members/7804365",
            "state": "AA",
            "lang": "en_US",
            "city": "MyCity",
            "country": "us",
            "id": "7804365",
            "visited": "Sat Feb 19 02: 36: 40 EST 2011",
            "topics": [
                {
                    "id": 3340,
                    "urlkey": "pickupsoccer",
                    "name": "Pick-up Soccer"
                },
                {
                    "id": 468,
                    "urlkey": "dads",
                    "name": "Dads"
                },
                {
                    "id": 20557,
                    "urlkey": "coed-soccer",
                    "name": "Coed Soccer"
                },
                {
                    "id": 148421,
                    "urlkey": "windowsphone",
                    "name": "Windows Phone"
                }
            ],
            "joined": "Thu Aug 07 15: 32: 06 EDT 2008",
            "bio": "",
            "name": "aaa bbbb",
            "other_services": {
                "linkedin": {
                    "identifier": "http: //www.bbb.com/in/zzzzz"
                }
            },
            "lat": "47.790000915527344"
        }
    ],
    "meta": {
        "lon": "",
        "count": 1,
        "link": "https: //api.aaaaa.com/members",
        "next": "",
        "total_count": 1,
        "url": "https: //api.aaaaa.com/members?relation=self&order=name&offset=0&format=json&page=800",
        "id": "",
        "title": "Members",
        "updated": "Fri Sep 10 13: 08: 07 EDT 2010",
        "description": "API method",
        "method": "Members",
        "lat": ""
    }
}

更新 为我的成员类添加一个封装整个 json 结果的包装器对象解决了这个问题。

public partial class Members
{
    public List<Member> results { get; set; }
    public object meta { get; set; }
}

然后我可以使用以下命令反序列化：

var members = JsonConvert.DeserializeObject<Members>(jsonstring);
4

3 回答 3

3

JSON 数据中大约存在三个问题区域：

  1. 它在这里呈现的方式，它包含很多在 JSON 中不起作用的开头和结尾的反斜杠和双引号。从您的问题中很难判断这是从 VisualStudio 调试器复制它的工件还是数据中的真正问题。

  2. 传输的数据不是成员实例列表，而是包含成员实例列表和一些附加元信息的对象。因此，您需要引入一个包含两个成员results和meta的附加类。

  3. 您的类成员使用以大写字母开头的属性，而 JSON 数据使用所有小写字母。您可以更改属性名称或使用数据DataMember注释：

所以解决方案可能是：

DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(JsonResponse));
JsonResponse jsonResponse = (JsonResponse)ser.ReadObject(response.ContentStream);

具有以下类定义：

[DataContract]
public partial class Member 
{
    [DataMember(Name = "state")]
    public string State { get; set; }
    [DataMember(Name = "joined")]
    public string Joined { get; set; }
    [DataMember(Name = "lat")]
    public string Lat { get; set; }
    [DataMember(Name = "zip")]
    public string Zip { get; set; }
    [DataMember(Name = "bio")]
    public string Bio { get; set; }
    [DataMember(Name = "name")]
    public string Name { get; set; }
    [DataMember(Name = "state")]
    public string City { get; set; }
    [DataMember(Name = "city")]
    public string Id { get; set; }
    [DataMember(Name = "link")]
    public string Link { get; set; }
    [DataMember(Name = "country")]
    public string Country { get; set; }
    [DataMember(Name = "visited")]
    public string Visited { get; set; }
    [DataMember(Name = "photo_url")]
    public string PhotoUrl { get; set; }
    [DataMember(Name = "lon")]
    public string Lon { get; set; }
}

[DataContract]
public class Meta
{
    [DataMember(Name = "lon")]
    public string Lon { get; set; }
    [DataMember(Name = "count")]
    public int Count { get; set; }
    [DataMember(Name = "link")]
    public string Link { get; set; }
    [DataMember(Name = "next")]
    public string Next { get; set; }
    [DataMember(Name = "total_count")]
    public int TotalCount { get; set; }
}

[DataContract]
public class JsonResponse
{
    [DataMember(Name = "results")]
    public List<Member> Results { get; set; }
    [DataMember(Name = "meta")]
    public Meta Meta { get; set; }
}
于 2011-02-20T12:37:29.797 回答
2

在我们的项目中，我们为此使用 Hammok，您可以尝试像这样修改您的类：

[DataContract]
public partial class Member 
{
   [DataMember(Name="zip")]
   public string Zip { get; set; }
   [DataMember(Name="photo_url")]
   public string Photo_url { get; set; }
   //Etc.
}
于 2011-02-20T10:03:35.340 回答
0

尝试使用 Json.net。我发现 DataContractJsonSerializer 太无能了。json.net 提供了强大的功能。可以在此链接中找到

http://json.codeplex.com/

它还包含 .dll 文件和文档。网页文档 http://james.newtonking.com/projects/json/help/

于 2011-02-20T09:11:00.430 回答