如何将BitmapImage转换为StorageFile？

Question

虽然拖放的图像，我需要转换为StorageFile的BitmapImage上传它。

       DataPackageView dataPackageView = Clipboard.GetContent();
       if (dataPackageView.Contains(StandardDataFormats.Bitmap))
       {
                    RandomAccessStreamReference img = await dataPackageView.GetBitmapAsync();
                    var imgstream = await img.OpenReadAsync();
                    BitmapImage bitmap = new BitmapImage();
                    bitmap.SetSource(imgstream);
                    StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(new Uri(bitmap.UriSource.ToString()));

                    IUploadFileModel   _uploadModel = ObjFactory.Instance.CreateUploadFileModel();
                  _uploadModel.UploadFileAsync(file, user, OpenChatData.TeamID.ToString(), _isReadReceiptEnabled);
           }

Answer 1

您不必将从剪贴板获取的数据转换为BitmapImage，您可以直接操作获取的RandomAccessStreamReference，并将其保存为本地文件，然后上传文件

var data = Clipboard.GetContent();
if (data.Contains(StandardDataFormats.Bitmap))
{
    var img = await data.GetBitmapAsync();
    var imgstream = await img.OpenReadAsync();
    string type = imgstream.ContentType;
    string extension = type.Replace("image/", "");
    var file = await ApplicationData.Current.LocalFolder.CreateFileAsync($"temp.{extension}", CreationCollisionOption.ReplaceExisting);
    byte[] buffer = new byte[imgstream.Size];
    await imgstream.ReadAsync(buffer.AsBuffer(), (uint)imgstream.Size, InputStreamOptions.None);
    await FileIO.WriteBytesAsync(file, buffer);
    // upload file
}

谢谢。