使用流添加到 azure blob 存储

Question

我正在尝试将通过 .net 核心网络 API 收到的 IFormFile 添加到 azure blob 存储。这些是我设置的属性：

static internal CloudStorageAccount StorageAccount => 
    new CloudStorageAccount(new StorageCredentials(AccountName, AccessKey, AccessKeyName), true);

// Create a blob client.
static internal CloudBlobClient BlobClient => StorageAccount.CreateCloudBlobClient();

// Get a reference to a container 
static internal CloudBlobContainer Container(string ContainerName) 
                        => BlobClient.GetContainerReference(ContainerName);

static internal CloudBlobContainer ProfilePicContainer 
        => Container(ProfilePicContainerName);

现在我这样使用ProfilePicContainer：

var Container = BlobStorage.ProfilePicContainer;
string fileName = Guid.NewGuid().ToString("N") + Path.GetExtension(ProfileImage.FileName);
var blockBlob = Container.GetBlockBlobReference(fileName);
var fileStream = ProfileImage.OpenReadStream();
fileStream.Position = 0;
await blockBlob.UploadFromStreamAsync(fileStream);

这给了我以下错误：

Microsoft.WindowsAzure.Storage.StorageException: 'Cannot access a closed Stream.'

Inner Exception ObjectDisposedException: Cannot access a closed Stream.

调试时，我什至在 fileStream.Position = 0 之前就注意到它的位置已经是 0。但是我添加了这一行，因为我收到了这个错误。同样在 await 行，fileStream 的 _disposed 设置为 false。

此外，关于 blob 连接，我尝试为字符串常量 AccessKey 设置无效值，但它显示完全相同的错误。这意味着我不知道它是否是偶数连接。我已经在调试器中检查了 blobBlock 内的所有值，但我不知道如何验证它是否已连接。

Answer 1

尝试直接从流写入时似乎出现了一些问题。通过将流转换为字节数组，我能够运行代码。

await blockBlob.UploadFromByteArrayAsync(ReadFully(fileStream, blockBlob.StreamWriteSizeInBytes),
                            0, (int)fileStream.Length);

ReadFully 是对这个答案的修改

static byte[] ReadFully(Stream input, int size)
{
    byte[] buffer = new byte[size];
    using (MemoryStream ms = new MemoryStream())
    {
        int read;
        while ((read = input.Read(buffer, 0, size)) > 0)
        {
            ms.Write(buffer, 0, read);
        }
        return ms.ToArray();
    }
}

使用流添加到 azure blob 存储

adding to azure blob storage with stream

c#

asynchronous

filestream

azure-storage

asp.net-core-webapi