如何在Azure Blob流中启用搜索 [英] How to enable seeking in Azure Blob stream

问题描述

我有一个从方法OpenWriter创建的BlobStream.

I have a BlobStream that is created from the method OpenWriter.

var blob = CloudContainer.GetBlobReference(name));
if (blob == null)
{
   return null;
}

return blob.OpenWrite();

使用此流，我想查找或设置位置，但是每次执行此操作时，我都会收到NotSupportedException.经过一些研究，我发现canSeek设置为false，这会导致此问题.但是，仅当长度未知时，CanSeek才为false.但是运行调试器时长度是已知的.

Using this stream i would like to seek or set the position, but each time i do this i get a NotSupportedException. After doing some research i found that the canSeek is set to false, which causes this problem. But, the CanSeek is false only if the length is unknown. But the length is known when i run the debugger.

为什么CanSeek是假的?我如何将其设置为true?

Why is CanSeek false? How can i make it set to true?

推荐答案

您可以在页面Blob中进行搜索-

You can seek within a page blob - there is explicit support for it in BlobWriteStreamBase class.

我认为您也可以阅读&使用HTTP Range 标头写入Block Blob的指定部分，这实际上与查找相同.但是我认为您必须自己实现.

I think you could also read & write to specified parts of a Block blob using HTTP Range headers, which would be effectively the same thing as seeking. But I think you'd have to implement that yourself.

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