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我正在尝试为 Windows Phone 应用程序解析 JSON 文件,我当前的代码是:

 private void Button1_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        Button1.FontSize = 15;
        Button1.Content = "Fetching...";
        var client = new WebClient();
        client.OpenReadCompleted +=
            (s, eargs) =>
            {
                var serializer = new DataContractJsonSerializer(typeof(RootObject));
                if (eargs.Error != null)
                {
                    if (eargs.Error.Message.Contains("NotFound"))
                    {
                        MessageBox.Show("Could not retrieve playlist", "Error", MessageBoxButton.OK);
                        Button1.Content = "Could not retrieve playlist";
                    }
                    else
                    {
                        MessageBox.Show("Could not retrieve playlist", "Error", MessageBoxButton.OK);
                        Button1.Content = "Could not retrieve playlist";
                    }
                }
                else
                {
                    var songHistory = (station1)serializer.ReadObject(eargs.Result);
                    Button1.Content = songHistory.text;
                }
            };
        var uri = new Uri("<JSONGOESHERE>");
        client.OpenReadAsync(uri);
    }

    public class station1
    {
        public string station { get; set; }
        public string title { get; set; }
        public string artist { get; set; }
        public string text { get; set; }
    }

    public class station2
    {
        public string station { get; set; }
        public int listeners { get; set; }
        public string title { get; set; }
        public string artist { get; set; }
        public string text { get; set; }
    }

    public class station3
    {
        public string station { get; set; }
        public int listeners { get; set; }
        public string title { get; set; }
        public string artist { get; set; }
        public string text { get; set; }
    }

    public class RootObject
    {
        public station1 station1 { get; set; }
        public station2 station2 { get; set; }
        public station3 station3 { get; set; }
    }

稍后我也需要为“station2”和“station3”获取相同的文本,这就是我将它们留在里面的原因。

目前,当我在线运行时出现以下错误

var songHistory = (station1)serializer.ReadObject(eargs.Result);

用户代码未处理 InvalidCastException 在 APP.DLL 中发生“System.InvalidCastException”类型的异常,但未在用户代码中处理 无法将“RootObject”类型的对象转换为“station1”类型。

我已经使用 json2csharp 生成器来创建上述内容,所以我不确定出了什么问题。

任何帮助都是极好的。

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2 回答 2

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您为 type 创建了一个序列化程序RootObject。所以输出ReadObject就是那个类型。只需正确转换(没有通用重载ReadObject):

var root = (RootObject)serializer.ReadObject(eargs.Result);
var songHistory = root.station1;
于 2013-01-03T08:50:43.993 回答
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您确定该方法也不必将 Type 作为反序列化的参数吗?

var songHistory = (station1)serializer.ReadObject(eargs.Result, typeof(station1));

或者它有一个通用的重载,可以进行反序列化并直接返回一个 T ?

var songHistory = serializer.ReadObject<station1>(eargs.Result);
于 2013-01-03T08:39:38.000 回答