我有用于从Web服务器下载的图像下面的代码:下载并在窗口中显示的图像8
private async void Test_Click(object sender, RoutedEventArgs e)
{
HttpClient httpClient = new HttpClient();
HttpRequestMessage request = new HttpRequestMessage(
HttpMethod.Get, "http://www.reignofcomputer.com/imgdump/sample.png");
HttpResponseMessage response = await httpClient.SendAsync(request,
HttpCompletionOption.ResponseHeadersRead);
var imageFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(
"sample.png", CreationCollisionOption.ReplaceExisting);
var fs = await imageFile.OpenAsync(FileAccessMode.ReadWrite);
DataWriter writer = new DataWriter(fs.GetOutputStreamAt(0));
writer.WriteBytes(await response.Content.ReadAsByteArrayAsync());
await writer.StoreAsync();
writer.DetachStream();
await fs.FlushAsync();
displayImage();
}
private void displayImage()
{
image1.Source = new BitmapImage(
new Uri("ms-appdata:///local/sample.png", UriKind.Absolute));
}
当我运行代码,图像无法显示,尽管出现在文件夹中(在
C:\用户\用户\应用程序数据\本地\套餐\ XXXXX \ LocalState)。
如果我再次运行它,我得到UnauthorizedAccessException was unhandled by user code
,Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
在CreateFileAsync
。
任何想法?
可能是其中之一“是它插好”的答案,但你有权限设置正确的文件夹? – AngryDuck 2013-05-01 15:23:02