C# JSON对象抛出空响应，但它不是'；t空

尝试使用

JavaScriptSerializer（）解析JSON对象。反序列化

，但在

foreach（getRoute.results中的var项）

处抛出空错误，其中

Route getRoute=new JavaScriptSerializer（）。反序列化（strresulttest）

问题是，当我通过打印内容调试strresulttest时，我能够看到预期的JSON输出，如图所示

解析JSON的代码：

     public class Route
    {
        public List<GetRoute> results { get; set; }
    }

    public class GetRoute
    {
        public string status_message { get; set; }
        public string viaRoute { get; set; }
        public string subtitle { get; set; }
        public int totalTime { get; set; }
        public int totalDistance { get; set; }
    }

    private void GetInstructions()
    {
        //GET METHOD for route query
        string strurltest = String.Format("https://developers.onemap.sg/privateapi/routingsvc/route?start="+
            startLat+","+ startLon +"&end="+ destinationLat +","+ destinationLon+"&"+
            "routeType="+ transportType + "&token="+token);
        WebRequest requestObjGet = WebRequest.Create(strurltest);
        requestObjGet.Method = "GET";
        HttpWebResponse responseObjGet = null;
        responseObjGet = (HttpWebResponse)requestObjGet.GetResponse();
        string strresulttest = null;
        using (Stream stream = responseObjGet.GetResponseStream())
        {
            StreamReader sr = new StreamReader(stream);
            strresulttest = sr.ReadToEnd();
            //reminder: remove after prod. GET is working.
            System.Diagnostics.Debug.WriteLine(strresulttest);
            sr.Close();
        }

        //display search recommendations
        Route getRoute = new JavaScriptSerializer().Deserialize<Route>(strresulttest);
        foreach (var item in getRoute.results)
        {
                //reminder: remove after prod. 
                System.Diagnostics.Debug.WriteLine("Route via: " + item.viaRoute + "\n");
                System.Diagnostics.Debug.WriteLine("Description: " + item.subtitle + "\n");
        }
    }

由于反序列化到的类结构与JSON不匹配，因此
结果中的值为空。您在问题中链接的JSON对应于此类结构：

public class Route
{
    public string status_message { get; set; }
    public string route_geometry { get; set; }
    public int status { get; set; }
    public List<List<object>> route_instructions { get; set; }
    public List<string> route_name { get; set; }
    public RouteSummary route_summary { get; set; }
    public string viaRoute { get; set; }
    public string subtitle { get; set; }
    public Phyroute phyroute { get; set; }
}

public class RouteSummary
{
    public string start_point { get; set; }
    public string end_point { get; set; }
    public int total_time { get; set; }
    public int total_distance { get; set; }
}

public class Phyroute
{
    public string status_message { get; set; }
    public string route_geometry { get; set; }
    public int status { get; set; }
    public List<List<object>> route_instructions { get; set; }
    public List<string> route_name { get; set; }
    public RouteSummary route_summary { get; set; }
    public string viaRoute { get; set; }
    public string subtitle { get; set; }
}

“我能够看到我预期的JSON输出，如图所示”您的整个问题（包括任何必要的代码）必须在您的问题中，而不仅仅是链接。原因有两个：人们不应该非得去场外帮助你；链接腐烂，使问题及其答案对未来的人们毫无用处。请将所有相关信息，包括JSON结构的一部分，放在问题中。更多：您的响应是
对象
而不是
数组
so
GetRoute route=JavaScriptSerializer（）。反序列化（strresulttest）
public class Route
{
    public string status_message { get; set; }
    public string route_geometry { get; set; }
    public int status { get; set; }
    public List<List<object>> route_instructions { get; set; }
    public List<string> route_name { get; set; }
    public RouteSummary route_summary { get; set; }
    public string viaRoute { get; set; }
    public string subtitle { get; set; }
    public Phyroute phyroute { get; set; }
}

public class RouteSummary
{
    public string start_point { get; set; }
    public string end_point { get; set; }
    public int total_time { get; set; }
    public int total_distance { get; set; }
}

public class Phyroute
{
    public string status_message { get; set; }
    public string route_geometry { get; set; }
    public int status { get; set; }
    public List<List<object>> route_instructions { get; set; }
    public List<string> route_name { get; set; }
    public RouteSummary route_summary { get; set; }
    public string viaRoute { get; set; }
    public string subtitle { get; set; }
}

Route route = new JavaScriptSerializer().Deserialize<Route>(strresulttest);
System.Diagnostics.Debug.WriteLine("Route via: " + route.viaRoute);
System.Diagnostics.Debug.WriteLine("Description: " + route.subtitle);