关于c#：Azure云存储SDK UploadFromStreamAsync不起作用

Azure Cloud storage SDK UploadFromStreamAsync not working

我正在尝试将文件上传到.Net Core 2.1中的Azure blob存储。以下是我的代码。

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IFormFileCollection files = formCollection.Files;

foreach (var file in files)
{
if (file.Length > 0)
{
_azureCloudStorage.UploadContent(cloudBlobContainer, file.OpenReadStream(), file.FileName);
}
}

UploadContent实现-

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public async void UploadContent(CloudBlobContainer containerReference, Stream contentStream, string blobName)
{
try
{
using (contentStream)
{
var blockBlobRef = containerReference.GetBlockBlobReference(blobName);
//await containerReference.SetPermissionsAsync(new BlobContainerPermissions
//{
// PublicAccess = BlobContainerPublicAccessType.Blob
//});
await blockBlobRef.UploadFromStreamAsync(contentStream);
}
}
catch(Exception ex)
{
//Error here
}
}

代码执行时出现以下错误-

{System.ObjectDisposedException: Cannot access a closed file. at
System.IO.FileStream.get_Position() at
Microsoft.AspNetCore.WebUtilities.FileBufferingReadStream.get_Position()
at
Microsoft.AspNetCore.Http.Internal.ReferenceReadStream.VerifyPosition()
at
Microsoft.AspNetCore.Http.Internal.ReferenceReadStream.ReadAsync(Byte[]
buffer, Int32 offset, Int32 count, CancellationToken
cancellationToken) at
Microsoft.WindowsAzure.Storage.Core.Util.StreamExtensions.WriteToAsync[T](Stream
stream, Stream toStream, IBufferManager bufferManager, Nullable1
copyLength, Nullable1 maxLength, Boolean calculateMd5,
ExecutionState1 executionState, StreamDescriptor streamCopyState,
CancellationToken token) in C:\\Program Files
(x86)\\Jenkins\\workspace\
elease_dotnet_master\\Lib\\Common\\Core\\Util\\StreamExtensions.cs:line
301 at
Microsoft.WindowsAzure.Storage.Blob.CloudBlockBlob.UploadFromStreamAsyncHelper(Stream
source, Nullable1 length, AccessCondition accessCondition,
BlobRequestOptions options, OperationContext operationContext,
IProgress1 progressHandler, CancellationToken cancellationToken) in
C:\\Program Files
(x86)\\Jenkins\\workspace\
elease_dotnet_master\\Lib\\WindowsRuntime\\Blob\\CloudBlockBlob.cs:line
352 at
Microsoft.WindowsAzure.Storage.Blob.CloudBlockBlob.UploadFromStreamAsyncHelper(Stream
source, Nullable1 length, AccessCondition accessCondition,
BlobRequestOptions options, OperationContext operationContext,
CancellationToken cancellationToken) in C:\\Program Files
(x86)\\Jenkins\\workspace\
elease_dotnet_master\\Lib\\WindowsRuntime\\Blob\\CloudBlockBlob.cs:line
290 at Common.AzureCloudStorage.UploadContent(CloudBlobContainer
containerReference, Stream contentStream, String blobName)

对我有用的替代解决方案：使用流添加到天蓝色的blob存储中

对此有任何帮助吗？如果可以提供更多详细信息，请告诉我。

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我的解决方案是包括文件长度并将位置设置为0。

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MemoryStream outStr = new MemoryStream();
CloudBlockBlob myBlob = container.GetBlockBlobReference(name);
outStr.Position = 0;
await myBlob.UploadFromStreamAsync(outStr, outStr.Length);

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几年后，出现相同问题(WindowsAzure.Storage版本3.0.3.0，targetFramework net45)。
Synchonous UploadFromStream有效，UploadFromStreamAsync不起作用。
我会投票怀疑Azure SDK不会磨练异步版本，而不是sdk使用不足。而且，我还是一位经验丰富的开发人员-经验丰富，不时会偶然发现已声明的Microsoft功能，但在仔细检查后无法使用。
对于其他异步方法(例如SetPropertiesAsync)，此处也是如此。我一直在调试我的方法(如下)，并且在每个* Async方法之后都失去了断点-这就是我弄清楚的方式。出于好奇，更改了UploadFromStreamAsync => UploadFromStream，然后将SetPropertiesAsync更改为SetProperties。

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public async Task StoreItem(string filename, MemoryStream content, string contentType, ICloudBlob cloudBlob)
{
cloudBlob.UploadFromStream(content); //this line works
//await cloudBlob.UploadFromStreamAsync(content); //doesn't work
cloudBlob.Properties.ContentType = contentType;
cloudBlob.SetProperties();
//await cloudBlob.SetPropertiesAsync(); //doesn't work either
}

我的解决方案是等到任务完成后再继续，例如

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private async void SaveAsync(IFormFile file)
{
CloudBlockBlob blob = this.blobContainer.GetBlockBlobReference(file.FileName);
var task = blob.UploadFromStreamAsync(file.OpenReadStream(), file.Length);

while (task.IsCompleted == false) {
Thread.Sleep(1000);
}

}

也许传递长度也有帮助吗？

相关讨论

我已经测试了您的方法UploadContent，效果很好。

我想您的问题可能是您收到的文件集合。

这是我的代码供您参考：

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using ConsoleAppCore.DAL;
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Blob;
using System;
using System.IO;

namespace ConsoleAppCore
{
class Program
{
static void Main(string[] args)
{
Run();
Console.WriteLine("Success");
Console.ReadLine();
}

public static void Run()
{
CloudStorageAccount storageAccount = CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=xxxxx;AccountKey=O7xB6ebGq8e86XQSy2vkvSi/x/exxxxxxxxxxkly1DsQPYY5dF2JrAVHtBozbJo29ZrrGJA==;BlobEndpoint=https://xxxx.blob.core.windows.net/;QueueEndpoint=https://xxxx.queue.core.windows.net/;TableEndpoint=https://xxxx.table.core.windows.net/;FileEndpoint=https://xxxx.file.core.windows.net/;");

CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = cloudBlobClient.GetContainerReference("containertest");

container.CreateIfNotExists();
DirectoryInfo dir = new DirectoryInfo("E://Test");

foreach (FileInfo file in dir.GetFiles())
{

BlobStorage.UploadContent(container, file.OpenRead(), file.Name);

}
}

}
}

以及我的BlobStorage类中的UploadContent方法：

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using Microsoft.Azure.Storage.Blob;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace ConsoleAppCore.DAL
{
public class BlobStorage
{
public static async void UploadContent(CloudBlobContainer containerReference, Stream contentStream, string blobName)
{
try
{
using (contentStream)
{

var blockBlobRef = containerReference.GetBlockBlobReference(blobName);
//await containerReference.SetPermissionsAsync(new BlobContainerPermissions
//{
// PublicAccess = BlobContainerPublicAccessType.Blob
//});
await blockBlobRef.UploadFromStreamAsync(contentStream);
}
}
catch (Exception ex)
{
//Error here
}
}
}
}

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