如何在Windows应用商店应用程序中将数据上载到azure blob时显示进度条

我已经按照下面的帖子做了分块上传到blob的工作

但这在windows应用商店应用程序或windows 8.1应用程序中不起作用，因为win 8.1应用程序中不支持MemoryStream

无论如何，我已经在上面的线程中修改了代码，并提出了如下内容

        CloudBlobClient myBlobClient = storageAccount.CreateCloudBlobClient();
        var filePicker = new FileOpenPicker();

        filePicker.FileTypeFilter.Add("*");
        var file = await filePicker.PickSingleFileAsync();
        string output = string.Empty;

            var fileName = file.Name;


        myBlobClient.SingleBlobUploadThresholdInBytes = 1024 * 1024;
        CloudBlobContainer container = myBlobClient.GetContainerReference("files");
        //container.CreateIfNotExists();
        CloudBlockBlob myBlob = container.GetBlockBlobReference(fileName);
        var blockSize = 256 * 1024;
        myBlob.StreamWriteSizeInBytes = blockSize;

        var fileProp = await file.GetBasicPropertiesAsync();
        var bytesToUpload = fileProp.Size;
        var fileSize = bytesToUpload;



        if (bytesToUpload < Convert.ToUInt64(blockSize))
        {
            CancellationToken ca = new CancellationToken();
            var ado = myBlob.UploadFromFileAsync(file).AsTask();
            await
                            //Console.WriteLine(ado.Status); //Does Not Help Much
                            ado.ContinueWith(t =>
                            {
                                //Console.WriteLine("Status = " + t.Status);
                                //Console.WriteLine("It is over"); //this is working OK
                            });
        }
        else
        {
            List<string> blockIds = new List<string>();
            int index = 1;
            ulong startPosition = 0;
            ulong bytesUploaded = 0;
            do
            {
                var bytesToRead = Math.Min(Convert.ToUInt64(blockSize), bytesToUpload);
                var blobContents = new byte[bytesToRead];




                using (Stream fs = await file.OpenStreamForWriteAsync())
                {
                    fs.Position = Convert.ToInt64(startPosition);
                    fs.Read(blobContents, 0, (int)bytesToRead);
                    //var iStream = fs.AsInputStream();



                    ManualResetEvent mre = new ManualResetEvent(false);
                    var blockId = Convert.ToBase64String(Encoding.UTF8.GetBytes(index.ToString("d6")));
                    //Console.WriteLine("Now uploading block # " + index.ToString("d6"));
                    blockIds.Add(blockId);
                    var ado = myBlob.PutBlockAsync(blockId, fs.AsRandomAccessStream(), null).AsTask();
                    await ado.ContinueWith(t =>
                              {
                                  bytesUploaded += bytesToRead;
                                  bytesToUpload -= bytesToRead;
                                  startPosition += bytesToRead;
                                  index++;
                                  double percentComplete = (double)bytesUploaded / (double)fileSize;
                                  output += (percentComplete * 100).ToString() + ",";
                        // AppModel.TasksFormObj.SetProgress(percentComplete * 100);
                        // Console.WriteLine("Percent complete = " + percentComplete.ToString("P"));
                        mre.Set();
                              });

                mre.WaitOne();
                }
            }
            while (bytesToUpload > 0);
            //Console.WriteLine("Now committing block list");
            var pbl = myBlob.PutBlockListAsync(blockIds).AsTask();
             pbl.ContinueWith(t =>
            {
                //Console.WriteLine("Blob uploaded completely.");
            });
        }
    }

然后，在最后一次提交时，在myBlob.PutBlockListAsync（blockIds）之后引发的错误指定的块列表无效

因此，请有人帮助我找出我做错了什么，或者什么可能的解决方案可以让它100%工作。

像这样使用

AsTask（）

 CancellationTokenSource _cts;

 _cts = new CancellationTokenSource();//<--In Constructor 

 var progress = new Progress<double>(TranscodeProgress); 
 await var ado = myBlob.UploadFromFileAsync(file).AsTask(_cts.Token, progress); 

CancellationTokenSource\u；
_cts=新的CancellationTokenSource（）// 像这样使用AsTask（）

 CancellationTokenSource _cts;

 _cts = new CancellationTokenSource();//<--In Constructor 

 var progress = new Progress<double>(TranscodeProgress); 
 await var ado = myBlob.UploadFromFileAsync(file).AsTask(_cts.Token, progress); 

CancellationTokenSource\u；
_cts=新的CancellationTokenSource（）//我刚刚尝试在Visual Studio 2013中创建一个Windows应用商店应用程序，MemoryStream对我可用。这是我尝试创建的：。我刚刚尝试在Visual Studio 2013中创建一个Windows应用商店应用程序，我可以使用MemoryStream。这就是我试图创建的内容：。