C# json反序列化itunes搜索api

Question

我只是无法让这种反序列化工作发挥作用。它没有给出错误，但 ArtistName 仍为空。

有人可以帮忙吗？

Json 字符串：

{ “结果计数”：1， “结果”： [ {“wrapperType”：“track”，“kind”：“song”，“artistId”：414401，“collectionId”：6666512，“trackId”：6666508，“artistName”：“自动驾驶关闭”，“collectionName”：“Make a Sound", "trackName":"Byron Black", "collectionCensoredName":"发出声音", [...]"

HttpWebRequest webRequest;

    void StartWebRequest(string itunesUrl)
    {
        webRequest = (HttpWebRequest)WebRequest.Create(itunesUrl); 
        webRequest.Method = "GET";
        webRequest.BeginGetResponse(new AsyncCallback(FinishWebRequest), null);

    }

    void FinishWebRequest(IAsyncResult result)
    {

        StreamReader sr = new StreamReader(webRequest.EndGetResponse(result).GetResponseStream());
        string json = sr.ReadToEnd();

        Log.debugToVS("json: " + json);


        iTunesResult itunesObj = new iTunesResult();

        itunesObj = JSONHelper.Deserialise<iTunesResult>(json);

        Log.debugToVS("artistId: " + itunesObj.artistName);

    }

    public void iTunesSearch(string artist, string album, string title)
    {

        if(artist == "" && album == "" && title == "") return;

        string query = "http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/wa/wsSearch?";

        query += "term=" + HttpUtility.UrlEncode(artist + " " + album + " " + title);

        query += "&media=music";
        query += "&limit=20";

        Log.debugToVS("url: " + query);

        StartWebRequest(query); 
    }

}

public class JSONHelper
{
    public static T Deserialise<T>(string json)
    {
        T obj = Activator.CreateInstance<T>();

        MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json));

            DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
            obj = (T)serializer.ReadObject(ms); // <== Your missing line



            return obj;

    }
}

[DataContract]
public class iTunesResult
{
    [DataMember]
    public string artistName { get; set; }
}

Answer 1

我认为您的数据合同有问题。查看 Json 数据契约应该是这样的。

[DataContract]
public class iTunesResult
{
    [DataMember]
    public iTuneJsonResults[] results { get; set; }
}


[DataContract]
public class iTuneJsonResults
{
    [DataMember]
    public string artistName { get; set; }
}

FinishWebrequest 中的 Log.xxxx 行应变为：

foreach(var item in itunesObj.results)
     Log.debugToVS("artistId: " + item.artistName);