按照 Microsoft AZ-204 学习路径，遇到错误“未处理的异常。System.NotSupportedException：Stream 不支持读取。”

Question

我正在关注 AZ-204：开发使用 Blob 存储的解决方案/使用位于此处的 Azure Blob 存储教程。

代码是复制/粘贴的，但我遇到了错误。 我不是 .net 开发人员，我不知道如何解决这个问题。 Microsoft 不为这种自学材料提供故障排除资源。 我希望找到解决此错误的帮助。

我试图运行的文件：

using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;

Console.WriteLine("Azure Blob Storage exercise\n");

// Run the examples asynchronously, wait for the results before proceeding
ProcessAsync().GetAwaiter().GetResult();

Console.WriteLine("Press enter to exit the sample application.");
Console.ReadLine();

static async Task ProcessAsync()
{
    // Copy the connection string from the portal in the variable below.
    string storageConnectionString = "[redacted]";

    // Create a client that can authenticate with a connection string
    BlobServiceClient blobServiceClient = new BlobServiceClient(storageConnectionString);

    // COPY EXAMPLE CODE BELOW HERE
    
    // CREATE A CONTAINER
    //Create a unique name for the container
    string containerName = "wtblob" + Guid.NewGuid().ToString();

    // Create the container and return a container client object
    BlobContainerClient containerClient = await blobServiceClient.CreateBlobContainerAsync(containerName);
    Console.WriteLine("A container named '" + containerName + "' has been created. " +
        "\nTake a minute and verify in the portal." + 
        "\nNext a file will be created and uploaded to the container.");
    Console.WriteLine("Press 'Enter' to continue.");
    Console.ReadLine();
    
    // UPLOAD BLOBS TO A CONTAINER
    // Create a local file in the ./data/ directory for uploading and downloading
    string localPath = "./data/";
    string fileName = "wtfile" + Guid.NewGuid().ToString() + ".txt";
    string localFilePath = Path.Combine(localPath, fileName);

    // Write text to the file
    await File.WriteAllTextAsync(localFilePath, "Hello, World!");

    // Get a reference to the blob
    BlobClient blobClient = containerClient.GetBlobClient(fileName);

    Console.WriteLine("Uploading to Blob storage as blob:\n\t {0}\n", blobClient.Uri);

    // Open the file and upload its data
    using (FileStream uploadFileStream = File.OpenWrite(localFilePath))
        {
    await blobClient.UploadAsync(uploadFileStream);
    uploadFileStream.Close();
        }

    Console.WriteLine("\nThe file was uploaded. We'll verify by listing" + 
            " the blobs next.");
    Console.WriteLine("Press 'Enter' to continue.");
    Console.ReadLine();
    
    // LIST THE BLOBS IN A CONTAINER
    // List blobs in the container
    Console.WriteLine("Listing blobs...");
    await foreach (BlobItem blobItem in containerClient.GetBlobsAsync())
    {
        Console.WriteLine("\t" + blobItem.Name);
    }

    Console.WriteLine("\nYou can also verify by looking inside the " + 
            "container in the portal." +
            "\nNext the blob will be downloaded with an altered file name.");
    Console.WriteLine("Press 'Enter' to continue.");
    Console.ReadLine();
    
    // DOWNLOAD BLOBS
    // Download the blob to a local file
    // Append the string "DOWNLOADED" before the .txt extension 
    string downloadFilePath = localFilePath.Replace(".txt", "DOWNLOADED.txt");

    Console.WriteLine("\nDownloading blob to\n\t{0}\n", downloadFilePath);

    // Download the blob's contents and save it to a file
    BlobDownloadInfo download = await blobClient.DownloadAsync();

    using (FileStream downloadFileStream = File.OpenWrite(downloadFilePath))
    {
        await download.Content.CopyToAsync(downloadFileStream);
    }
    Console.WriteLine("\nLocate the local file in the data directory created earlier to verify it was downloaded.");
    Console.WriteLine("The next step is to delete the container and local files.");
    Console.WriteLine("Press 'Enter' to continue.");
    Console.ReadLine();
    
    // DELETE A CONTAINER
    // Delete the container and clean up local files created
    Console.WriteLine("\n\nDeleting blob container...");
    await containerClient.DeleteAsync();

    Console.WriteLine("Deleting the local source and downloaded files...");
    File.Delete(localFilePath);
    File.Delete(downloadFilePath);

    Console.WriteLine("Finished cleaning up.");
    
    
}

我能够验证容器是在 azure 门户中创建的，然后代码运行到第 46 行，其中记录了“作为 blob 上传到 Blob 存储：”，然后遇到错误。 控制台output（包括报错之前）：

Azure Blob Storage exercise

A container named 'wtblob167d9a9b-d4c0-4b2c-9ea3-21d2c90fd386' has been created. 
Take a minute and verify in the portal.
Next a file will be created and uploaded to the container.
Press 'Enter' to continue.

Uploading to Blob storage as blob:
         https://[redacted].blob.core.windows.net/wtblob167d9a9b-d4c0-4b2c-9ea3-21d2c90fd386/wtfilebfbd8b5e-d5b3-487c-885b-364db2fe126a.txt

Unhandled exception. System.NotSupportedException: Stream does not support reading.
   at System.IO.Strategies.BufferedFileStreamStrategy.CopyToAsync(Stream destination, Int32 bufferSize, CancellationToken cancellationToken)
   at System.IO.FileStream.CopyToAsync(Stream destination, Int32 bufferSize, CancellationToken cancellationToken)
   at Azure.Storage.NonDisposingStream.CopyToAsync(Stream destination, Int32 bufferSize, CancellationToken cancellationToken)
   at Azure.Core.RequestContent.StreamContent.WriteToAsync(Stream stream, CancellationToken cancellation)
   at Azure.Core.Pipeline.HttpClientTransport.PipelineRequest.PipelineContentAdapter.SerializeToStreamAsync(Stream stream, TransportContext context, CancellationToken cancellationToken)
   at System.Net.Http.HttpContent.<CopyToAsync>g__WaitAsync|56_0(ValueTask copyTask)
   at System.Net.Http.HttpConnection.SendRequestContentAsync(HttpRequestMessage request, HttpContentWriteStream stream, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
   at Azure.Core.Pipeline.HttpClientTransport.ProcessAsync(HttpMessage message, Boolean async)
   at Azure.Core.Pipeline.HttpPipelineTransportPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline)
   at Azure.Core.Pipeline.ResponseBodyPolicy.ProcessAsync(HttpMessage message, ReadOnlyMemory`1 pipeline, Boolean async)    
   at Azure.Core.Pipeline.HttpPipelineSynchronousPolicy.<ProcessAsync>g__ProcessAsyncInner|4_0(HttpMessage message, ReadOnlyMemory`1 pipeline)
onary`2 metadata, IDictionary`2 tags, BlobRequestConditions conditions, Nullable`1 accessTier, BlobImmutabilityPolicy immutabilityPolicy, Nullable`1 legalHold, IProgress`1 progressHandler, UploadTransferValidationOptions transferValidationOverride, String operationName, Boolean async, CancellationToken cancellationToken)
   at Azure.Storage.Blobs.Specialized.BlockBlobClient.<>c__DisplayClass64_0.<<GetPartitionedUploaderBehaviors>b__0>d.MoveNext()
--- End of stack trace from previous location ---   at Azure.Storage.PartitionedUploader`2.UploadInternal(Stream content, Nullable`1 expectedContentLength, TServiceSpecificData args, IProgress`1 progressHandler, Boolean async, CancellationToken cancellationToken)   at Azure.Storage.Blobs.BlobClient.StagedUploadInternal(Stream content, BlobUploadOptions options, Boolean async, CancellationToken cancellationToken)
   at Azure.Storage.Blobs.BlobClient.UploadAsync(Stream content)   at Program.<<Main>$>g__ProcessAsync|0_0() in C:\Users\[redacted]\Documents\devops\working with blob storage module\az204-blob\Program.cs:line 51
   at Program.<Main>$(String[] args) in C:\Users\[redacted]\Documents\devops\working with blob storage module\az204-blob\Program.cs:line 7

我从教程中复制了代码并尝试按照给定的说明运行它。 它开始时很好，但在尝试将新文件上传到 blob 时抛出错误。 我希望将新文件写入 blob，并执行其余指令。

Answer 1

我能够使用相同的代码在本地重现该问题，并且在进行以下更改后我能够成功上传它：

旧代码：

// 打开文件并上传数据

using (FileStream uploadFileStream = File.OpenWrite(localFilePath))
    {
await blobClient.UploadAsync(uploadFileStream);
uploadFileStream.Close();
    }

//修改代码

FileStream uploadFileStream = File.Open(localFilePath, FileMode.Open);
blobClient.Upload(uploadFileStream);

uploadFileStream.Close();

让我知道是否有帮助！