Azure GetBlobReference 属性后为空

Question

我尝试在 BlobHelper.GetBlobReference() 下载之后或之前获取属性进行日志记录，最后我尝试使用 blob.FetchAttributes();但不起作用我的属性为空。我的容器和 blob 没有权限

         public static CloudBlob GetBlobReference(string containerName,string fileName)
         {
        var blobClient = GetBlobClient();
        if (blobClient != null)
           {
            var contRef=blobClient.GetContainerReference(containerName);
            return contRef.GetBlobReference(fileName);
            }
        return null;
          }

         var blob = BlobHelper.GetBlobReference(SelectedContainer, 
         fileName);

        if (blob.Properties != null)
        {
          //I try to get Lenght of blob but it is -1
        }

Answer 1

这是预期的行为。 GetBlobReference 只是在客户端上创建一个 CloudBlob 实例，并不发出网络请求。来自文档link :

Call this method to return a reference to a blob of any type in this container. Note that this method does not make a request against Blob storage. You can return a reference to the blob whether or not it exists yet.

如果您想要填充属性，则必须调用 FetchAttributes或使用GetBlobReferenceFromServer .