public async Task GetDistrictData()
{
if (this.DistrictList.Count != 0)
{
return;
}
StorageFolder folder = ApplicationData.Current.LocalFolder;
// var file = await folder.GetFileAsync("DistrictDataBackup.json");
var file = await folder.GetFileAsync("DistrictData.json");
string districtJsonText = await FileIO.ReadTextAsync(file);
JsonObject districtJsonObject = JsonObject.Parse(districtJsonText);
// New DistrictData object
foreach (var districtName in districtJsonObject.Keys)
{
JsonObject postcodeAddressJsonObj = districtJsonObject[districtName].GetObject();
List<string> postcodeList = new List<string>(postcodeAddressJsonObj.Keys);
District district = new District(districtName, postcodeList);
this.DistrictList.Add(district);
// List for all Postcode items
List<PostCodeItem> postcodeItemList = (from postcode in postcodeList let addressListJsonArray = postcodeAddressJsonObj[postcode].GetArray() let addressList = addressListJsonArray.Select(address => address.GetString()).ToList() select new PostCodeItem(postcode, addressList)).ToList();
this.PostCodeLibrary.Add(district, postcodeItemList);
}
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>.
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
// TODO: Create an appropriate data model for your problem domain to replace the sample data.
_currentDistrict = (District)e.NavigationParameter;
this.DefaultViewModel[DistrictDataName] = _currentDistrict;
}