// Extract a single zip archive entry to the given folder
private async Task ExtractZipEntryAsync(ZipArchiveEntry entry, StorageFolder folder)
{
try
{
using (Stream entryStream = entry.Open())
{
byte[] buffer = new byte[entry.Length];
entryStream.Read(buffer, 0, buffer.Length);
string filePath = entry.FullName.Replace('/', '\\');
StorageFile uncompressedFile = await folder.CreateFileAsync(filePath, CreationCollisionOption.ReplaceExisting);
using (var uncompressedFileStream = await uncompressedFile.OpenAsync(FileAccessMode.ReadWrite))
{
using (Stream outstream = uncompressedFileStream.AsStreamForWrite())
{
outstream.Write(buffer, 0, buffer.Length);
outstream.Flush();
}
}
}
}
catch (Exception ex)
{
DownloadErrors.Add(ex.ToString());
RaisePropertyChanged("HasDownloadErrors");
}
}
/// <summary>Downloads a .zip file from online URL and extracts it to the App Local Foilder</summary>
public async Task DownloadLocalDataAsync()
{
try
{
IsDownloading = true;
CurrentFileName = string.Empty;
DownloadErrors.Clear();
CurrentAction = "Downloading...";
var client = new HttpClient();
var response = await client.GetAsync(SampleDataUrl);
CurrentAction = "Reading Archive...";
var zipStream = await response.Content.ReadAsStreamAsync();
CurrentAction = "Extracting Files...";
await ExtractZipArchive(zipStream, ApplicationData.Current.LocalFolder);
LastDownloadDate = DateTime.Now.ToString();
ApplicationData.Current.LocalSettings.Values["LastDataDownloadDate"] = LastDownloadDate;
}
catch (Exception ex)
{
DownloadErrors.Add(ex.Message);
RaisePropertyChanged("HasDownloadErrors");
}
finally
{
IsDownloading = false;
}
}