Question

我正在为Windows Phone开发一个应用程序，其中ListBox显示来自Json文件的数据。当我的Json文件有一个项目时，我的代码工作正常，但是当更多的时候，例外是

＆＃34;从JsonReader读取JObject时出错。当前的JsonReader项目不是 object：StartArray。路径＆＃34;，第1行，第1位。＆＃34;

Json1工作正常时：

{"xId":"52","result":{"type":"Basico.Bean.MunicipioClass.TMunicipio","id":1,"fields":{"FRefCount":0,"FId":52,"FNome":"Sumare","FEstado":"SP","FPais":"Brasil"}}}

Json2工作不好时：

[{"xId":"52","result":{"type":"Basico.Bean.MunicipioClass.TMunicipio","id":1,"fields":{"FRefCount":0,"FId":52,"FNome":"Sumare","FEstado":"SP","FPais":"Brasil"}}},{"xId":"53","result":{"type":"Basico.Bean.MunicipioClass.TMunicipio","id":2,"fields":{"FRefCount":0,"FId":53,"FNome":"Paulinia","FEstado":"SP","FPais":"Brasil"}}}]

我的代码：

 public PivotPage1()
    {
        InitializeComponent()
        String text;

        using (var store = IsolatedStorageFile.GetUserStoreForApplication())
        using (var readStream = new IsolatedStorageFileStream("json.html", FileMode.Open, FileAccess.Read, FileShare.Read, store))
        using (var reader = new StreamReader(readStream))
        {
            text = reader.ReadToEnd();
        }
        {
            try
            {
                DataContext = this;

                // Your JSON string
                string json = text;

                // Parse as JObject
                JObject jObj = JObject.Parse(json);

                // Extract what you need, the "fields" property
                JToken jToken = jObj["result"]["fields"];

                // Convert as Fields class instance
                Fields fields = jToken.ToObject<Fields>();

                Items = new ObservableCollection<Fields>() { fields };
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

    }
    public ObservableCollection<Fields> Items { get; set; }

    public class Fields
    {
        [JsonProperty(PropertyName = "FId")]
        public int FId { get; set; }

        public string FNome { get; set; }
        public string FEstado { get; set; }
        public string FPais { get; set; }
    }
        private void AddProd(object sender, RoutedEventArgs e)
    {

        if (ListBoxx.SelectedItem != null)
        {
            Fields fi = (Fields)this.ListBoxx.SelectedItem;


            ListBoxx2.Items.Add(fi);



        }
        else
        {
            MessageBox.Show("Selecione um item para adicionar!");
        }
    }

Answer 1

您应该将json解析为数组而不是对象。你最好的选择是让json保持一致，即总是有一个集合，即使你只有一个项目。

然后你可以解析你的json：

JArray arr = JArray.Parse(json);

foreach (JObject obj in arr.Children<JObject>())
{
...
}

使用Json的Windows Phone - 从JsonReader读取JObject时出错

1 个答案: