c# - 序列化异常 : unexpected character '<'

Question

我有一个简单的方法来获取天气数据，当我调用它时发生了这个错误:

System.Runtime.Serialization.SerializationException was unhandled by user code HResult=-2146233076 Message=There was an error deserializing the object of type UWpWeather.RootObject. Encountered unexpected character '<'.

public async static Task <RootObject> GetWeather(double lat, double lng) {
    var http = new HttpClient();
    var response = await http.GetAsync("http://api.openweathermap.org/data/2.5/forecast/daily?q=leeds&type=accurate&mode=xml&units=metric&cnt=3&appid= MY AIP-KEY");
    string 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;
}

Answer 1

API 不接受您在请求中传递的任何 HTTP 内容或接受 header ，而是根据查询字符串参数设置响应的内容类型。

您的初始网址:

http://api.openweathermap.org/data/2.5/forecast/daily?q=leeds&type=accurate&mode=xml&units=metric&cnt=3&appid= MY AIP-KEY"

它应该是什么:

http://api.openweathermap.org/data/2.5/forecast/daily?q=leeds&type=accurate&mode=json&units=metric&cnt=3&appid= MY AIP-KEY"

这应该允许您将其反序列化为您的 RootObject 正确。

警告:我没有您的根对象实现，所以我只能在收到 JSON 格式的响应之前进行验证。