Question

我有一个包含文件上传到Azure存储的表单。这是调用ToStream（）方法的地方：

 Image img= Image.FromStream(file.InputStream, true, true);
 if (img.Height != height || img.Width != width)
 img= img.GetThumbnailImage(width, height, null, new IntPtr());
 img.ToStream().SaveAsBlob(blobname, filename);

这是ToStream（）方法：

public static Stream ToStream(this Image image)
{
    Stream ms = new MemoryStream();
    image.Save(ms, ImageFormat.Jpeg);
    ms.Position = 0;
    return ms;
}

我得到的错误是：

  image.Save(ms, ImageFormat.Jpeg);

错误是

'ms.ReadTimeout' threw an exception of type 'System.InvalidOperationException'
'ms.WriteTimeout' threw an exception of type 'System.InvalidOperationException'

它的基础是：

Timeouts are not supported on this stream

这是SaveAsBlob（）方法：

public static void SaveAsBlob(this Stream stream, string containername, string blobname)
{
     BlobHelper helper = new BlobHelper();
     CloudBlobContainer container = helper.ContainerGet(containername);
     helper.BlobDelete(container, blobname);
     helper.BlobAdd(container, blobname, stream);
}

BlobHelper类：

public class BlobHelper
{
    private const int MaxBlockSize = 4000000;

    private CloudStorageAccount _CloudStorageAccount { get; set; }

    public BlobHelper()
    {
        this._CloudStorageAccount = CloudStorageAccount.Parse(ConfigurationManager.ConnectionStrings[StaticConfiguration.ConnectionString].ConnectionString);
    }

    public CloudBlobContainer ContainerGet(string adi)
    {
        CloudBlobClient blobClient = _CloudStorageAccount.CreateCloudBlobClient();
        CloudBlobContainer container = blobClient.GetContainerReference(adi);
        container.CreateIfNotExists();
        BlobContainerPermissions containerPermissions = new BlobContainerPermissions();
        containerPermissions.PublicAccess = BlobContainerPublicAccessType.Blob;
        container.SetPermissions(containerPermissions);
        return container;
    }

    public Uri BlobAdd(string filePath, CloudBlobContainer container)
    {
        byte[] fileContent = File.ReadAllBytes(filePath);
        string blobName = Path.GetFileName(filePath);
        return BlobAdd(fileContent, container, blobName);
    }

    public Uri BlobAdd(CloudBlobContainer container, string adi, Stream stream)
    {
        adi = adi.Replace("//", "/");
        byte[] content = new byte[stream.Length];
        stream.Read(content, 0, (int)stream.Length);
        return BlobAdd(content, container, adi);
    }

    public Uri BlobAdd(byte[] fileContent, CloudBlobContainer container, string blobName)
    {
        CloudBlockBlob blob = container.GetBlockBlobReference(blobName);

        HashSet<string> blocklist = new HashSet<string>();
        foreach (FileBlock block in GetFileBlocks(fileContent))
        {
            blob.PutBlock(
                block.Id,
                new MemoryStream(block.Content, true),
                null
                );

            blocklist.Add(block.Id);
        }
        blob.PutBlockList(blocklist);
        blob.FetchAttributes();
        blob.Properties.CacheControl = "public, max-age=31536000";
        blob.SetProperties();
        return blob.Uri;
    }

    private IEnumerable<FileBlock> GetFileBlocks(byte[] fileContent)
    {
        HashSet<FileBlock> hashSet = new HashSet<FileBlock>();
        if (fileContent.Length == 0)
            return new HashSet<FileBlock>();

        int blockId = 0;
        int ix = 0;

        int currentBlockSize = MaxBlockSize;

        while (currentBlockSize == MaxBlockSize)
        {
            if ((ix + currentBlockSize) > fileContent.Length)
                currentBlockSize = fileContent.Length - ix;

            byte[] chunk = new byte[currentBlockSize];
            Array.Copy(fileContent, ix, chunk, 0, currentBlockSize);

            hashSet.Add(
                new FileBlock()
                {
                    Content = chunk,
                    Id = Convert.ToBase64String(System.BitConverter.GetBytes(blockId))
                });

            ix += currentBlockSize;
            blockId++;
        }

        return hashSet;
    }

    public void BlobGet(CloudBlobContainer container, string adi, Stream stream)
    {
        CloudBlockBlob blob = container.GetBlockBlobReference(adi);
        blob.DownloadToStream(stream);
    }

    public IEnumerable<IListBlobItem> BlobListGet(CloudBlobContainer container)
    {
        return container.ListBlobs();
    }

    public void BlobDelete(CloudBlobContainer container, string adi)
    {
        CloudBlockBlob blob = container.GetBlockBlobReference(adi);
        blob.DeleteIfExists();
    }
}

Answer 1

如果在调用container.CreateIfNotExists或container.SetPermissions时收到403错误，请确保您使用的连接字符串包含有效的帐户密钥。您可以在Azure门户中进行检查，然后重新生成密钥并替换web / app.config中的旧密钥。

将文件上载到Azure存储会导致错误：此流不支持超时

1 个答案: