UWP Json to C# conversion

Question

我想序列化一些我从网络上获得的JSON数据并使用数据，因此我转到http://json2csharp.com/，然后将JSON转到下面的

json: [{"line_descr":"u03a0u0395u0399u03a1u0391u0399u0391u03a3 - 
u0392u039fu03a5u039bu0391","line_descr_eng":"PEIRAIAS - VOYLA"}]

到此类别：

    public class RootObject
    {
        public string line_descr { get; set; }
        public string line_descr_eng { get; set; }
    }

这是我的代码：

class LineName
{
    public async static Task<RootObject> GetLineName(int linecode)
    {
        var http = new HttpClient();
        var response = await http.GetAsync("http://telematics.oasa.gr/api/?act=getLineName&p1=962");
        var result = await response.Content.ReadAsStringAsync();
        var serializer = new DataContractJsonSerializer(typeof(RootObject));
        var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
        var data = (RootObject)serializer.ReadObject(ms);
        return data;
    }
}
[DataContract]
public class RootObject
{
    [DataMember]
    public string line_descr { get; set; }
    [DataMember]
    public string line_descr_eng { get; set; }
}

    private async void Button_Click(object sender, RoutedEventArgs e)
    {
        RootObject myLine = await LineName.GetLineName(92);
        ResultTextBlock.Text = myLine.line_descr_eng;
    }

所以当我尝试获取数据并在文本块中显示它时，我会收到错误：line_descr_eng为null。

有人可以指向故障在哪里吗？因为line_descr_eng应该是 peiraias- voyla，但我的是无效的，经过大量搜索，我找不到错误的位置。

Answer 1

您的JSON是一个数组，而不是对象，您应该将其列为数组。

public async static Task<RootObject[]> GetLineName(int linecode)
{
    var http = new HttpClient();
    var response = await http.GetAsync("http://telematics.oasa.gr/api/?act=getLineName&p1=962");
    var result = await response.Content.ReadAsStringAsync();
    var serializer = new DataContractJsonSerializer(typeof(RootObject[]));
    var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
    var data = (RootObject[])serializer.ReadObject(ms);
    return data;
}
//...

 var myLines = await LineName.GetLineName(92);
 var myLine = myLines.FirstOrDefault();

您也不需要内存流，您可以从HTTP响应中读取流

var result = await response.Content.ReadAsStreamAsync();

Answer 2

您可以简单地使用JavaScriptSerializer类，而不是Datacontractjsonserialializer类似：

替换：

var serializer = new DataContractJsonSerializer(typeof(RootObject));
var ms = new MemoryStream(Encoding.UTF8.GetBytes(result));
var data = (RootObject)serializer.ReadObject(ms);

与此：

var ser = new JavaScriptSerializer();
var test = ser.Deserialize<List<RootObject>>(json);

---

如果找不到JavaScriptSerializer，则必须执行以下步骤：

1. 右键单击引用，然后添加参考，然后从汇编 ->框架select select seless.web.extensions。

2. 现在您应该能够将以下内容添加到类文件中：

   using System.Web.Script.Serialization;
   

引用：https：//stackoverflow.com/a/15391388/5056173