[英]How to get child objects from a JArray into an ObservableCollection
I am developing an app for Windows Phone, where a ListBox shows data from a JSON file. 我正在为Windows Phone开发一个应用程序,其中的ListBox显示来自JSON文件的数据。 I'm using a JArray
and I can display data according to an array position. 我正在使用JArray
并且可以根据数组位置显示数据。 But what if I want to display all data from my JSON file (the file doesn't have static data, and the data may be modified later)? 但是,如果我想显示JSON文件中的所有数据(该文件没有静态数据,并且以后可能会修改数据)怎么办?
My JSON: 我的JSON:
[
{
"xId": "52",
"result": {
"type": "Basico.Bean.MunicipioClass.TMunicipio",
"id": 1,
"fields": {
"FRefCount": 0,
"FId": 52,
"FNome": "Sumare",
"FEstado": "SP",
"FPais": "Brasil"
}
}
},
{
"xId": "52",
"result": {
"type": "Basico.Bean.MunicipioClass.TMunicipio",
"id": 1,
"fields": {
"FRefCount": 0,
"FId": 52,
"FNome": "Indaiatuba",
"FEstado": "SP",
"FPais": "Brasil"
}
}
}
]
My Code: 我的代码:
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
JArray jObj = JArray.Parse(json);
// Extract what you need, the "fields" property
JToken jToken = jObj[0]["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; }
}
When i used "[0]" the return is Sumare SP
: 当我使用“ [0]”时,返回的是Sumare SP
:
JToken jToken = jObj[0]["result"]["fields"];
When i used "[1]" the return is Indaiatuba SP
: 当我使用“ [1]”时,返回的是Indaiatuba SP
:
JToken jToken = jObj[1]["result"]["fields"];
I need it like this: 我需要这样:
Sumare SP Indaiatuba SP
If I understand your question correctly, you are trying to get all of the "fields" objects from the JSON into your ObservableCollection<Fields>
. 如果我正确理解了您的问题,则您正在尝试将JSON中的所有“字段”对象放入您的ObservableCollection<Fields>
。 Here is how you can do that: 这是您可以执行的操作:
JArray jObj = JArray.Parse(json);
Items = new ObservableCollection<Fields>(
jObj.Children().Select(jo => jo["result"]["fields"].ToObject<Fields>()));
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