将DataTable上载到Azure Blob存储 [英] Uploading DataTable to Azure blob storage

问题描述

我正在尝试将DataTable序列化为XML，然后将其上传到Azure blob存储.

I am trying to serialize a DataTable to XML and then upload it to Azure blob storage.

下面的代码可以工作，但是看起来很笨拙并且占用大量内存.有一个更好的方法吗?我特别指的是我将内存流转储到字节数组，然后从中创建新的内存流的事实.

The below code works, but seems clunky and memory hungry. Is there a better way to do this? I'm especially referring to the fact that I am dumping a memory stream to a byte array and then creating a new memory stream from it.

        var container = blobClient.GetContainerReference("container");
        var blockBlob = container.GetBlockBlobReference("blob");

        byte[] blobBytes;
        using (var writeStream = new MemoryStream())
        {
            using (var writer = new StreamWriter(writeStream))
            {
                table.WriteXml(writer, XmlWriteMode.WriteSchema);

            }
            blobBytes = writeStream.ToArray();
        }
        using (var readStream = new MemoryStream(blobBytes))
        {
            blockBlob.UploadFromStream(readStream);
        }

推荐答案

新答案:

我已经了解了一种更好的方法，该方法是直接向blob打开写流.例如:

I've learned of a better approach, which is to open a write stream directly to the blob. For example:

        using (var writeStream = blockBlob.OpenWrite())
        {
            using (var writer = new StreamWriter(writeStream))
            {
                table.WriteXml(writer, XmlWriteMode.WriteSchema);

            }
        }

对于我们的开发人员而言，这不需要将整个表都缓存在内存中，并且可能会遇到较少的数据复制.

Per our developer, this does not require the entire table to be buffered in-memory, and will probably encounter less copying around of data.

原始答案:

您可以使用CloudBlockBlob.UploadFromByteArray方法，并直接上传字节数组，而不用创建第二个流.

You can use the CloudBlockBlob.UploadFromByteArray method, and upload the byte array directly, instead of creating the second stream.

请参见 https://msdn .microsoft.com/en-us/library/microsoft.windowsazure.storage.blob.cloudblockblob.uploadfrombytearray.aspx 获取方法语法.

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