c# - 访问 blob uri 时出现 ResourceNotFound

Question

我尝试通过 Azure Blob 存储中的 URL 检索图像，但找不到它，这就是我得到的结果:

我的代码如下:

public async Task<bool> UploadFileAsync(string containerReference, string blobReference, string route)
    {
        CloudBlobContainer container = blobClient.GetContainerReference(containerReference);
        container.CreateIfNotExists();
        CloudBlockBlob blob = container.GetBlockBlobReference(blobReference);

        try
        {
            using (var fileStream = System.IO.File.OpenRead(route))
            {
                await blob.UploadFromStreamAsync(fileStream);
            }
        }
        catch (System.Exception)
        {
            return false;
        }

        return true;
    }

成功将文件上传到 blob:

然后我尝试检索其 URL 以直接访问它:

public string GetBlobUrl(string containerReference, string blobReference)
    {
        CloudBlobContainer container = blobClient.GetContainerReference(containerReference);
        CloudBlockBlob blob = container.GetBlockBlobReference(blobReference);

        return blob.Uri.ToString();
    }

我做错了什么？

Answer 1

默认情况下，容器及其 ​​Blob 只能由存储帐户所有者访问。如果您希望私有(private)容器中的 blob 可以通过匿名请求读取，您可以 grant public read access for blobs 。此外，正如 David Makogon 在评论中提到的，您还可以 grant temporary public access to a private blob via shared access signature .

CloudBlobContainer container = cloudBlobClient.GetContainerReference("mycontainer");   
CloudBlockBlob blob = container.GetBlockBlobReference("testimg.PNG");

SharedAccessBlobPolicy sasConstraints = new SharedAccessBlobPolicy();
sasConstraints.SharedAccessStartTime = DateTimeOffset.UtcNow.AddMinutes(-5);
sasConstraints.SharedAccessExpiryTime = DateTimeOffset.UtcNow.AddDays(7);
sasConstraints.Permissions = SharedAccessBlobPermissions.Read;


string sasBlobToken = blob.GetSharedAccessSignature(sasConstraints);
string URL = blob.Uri + sasBlobToken;