private async Task LoadJson()
{
if (Connectivity.NetworkAccess != NetworkAccess.Internet)
{
await Application.Current.MainPage.DisplayAlert("Benötige Internetverbindung", "Zum Laden der Dateien wird eine Internetverbindung benötigt.", "Okay");
}
else
{
try
{
DataStatus = "Lade Artinformationen …";
//load version file from internet
//json / bodentier_app_json
var versions = await _fileHelper.DownloadFileAsync(ServiceUrl + VersionsFile);
//get last time updated
var versionJsonString = System.Text.Encoding.UTF8.GetString(versions, 0, versions.Length);
JObject versionJson = JObject.Parse(versionJsonString);
var versionDate = versionJson["Versions.json"].Value <string>();
if (_fileHelper.FileExists(VersionsFile))
{
//if internet files not already loaded (== _oldVersionDate not set) and more up to date
if (!String.IsNullOrEmpty(_oldVersionDate) && versionDate != _oldVersionDate)
{
//update all files out of date
foreach (var file in versionJson)
{
var fileName = file.Key;
if (versionJson[fileName].Value <string>() != _oldVersionJson[fileName].Value <string>())
{
var jsonFile = await _fileHelper.DownloadFileAsync(ServiceUrl + fileName);
_fileHelper.CopyFileToLocal(jsonFile, fileName);
}
}
}
}
//load all files for the first time
else
{
foreach (var firstFile in versionJson)
{
var firstFileName = firstFile.Key;
var firstJsonFile = await _fileHelper.DownloadFileAsync(ServiceUrl + firstFileName);
_fileHelper.CopyFileToLocal(firstJsonFile, firstFileName);
}
}
//reload the Data in App
((App)App.Current).LoadData();
}
catch (Exception e)
{
var msg = e.InnerException;
Result = "Beim Laden der Artinformationen ist ein Problem aufgetreten.";
}
}
}