Azure download blob part
本文关键字:part blob download Azure | 更新日期: 2023-09-27 17:55:36
如果有人有DownloadRangeToStream功能的经验,我将不胜感激。
在这里他们说参数"长度"是数据的长度,但根据我的经验,它是要下载的段的上部位置,例如"长度"-"偏移量"=数据的实际长度。
如果有人能给我一些代码来分块下载 blob,我也将不胜感激,因为前面提到的函数似乎不起作用。
感谢您的任何帮助
试试这段代码。它通过将大型 blob 拆分为 1 MB 块来下载该块。
static void DownloadRangeExample()
{
var cloudStorageAccount = CloudStorageAccount.DevelopmentStorageAccount;
var containerName = "container";
var blobName = "myfile.zip";
int segmentSize = 1 * 1024 * 1024;//1 MB chunk
var blobContainer = cloudStorageAccount.CreateCloudBlobClient().GetContainerReference(containerName);
var blob = blobContainer.GetBlockBlobReference(blobName);
blob.FetchAttributes();
var blobLengthRemaining = blob.Properties.Length;
long startPosition = 0;
string saveFileName = @"D:'myfile.zip";
do
{
long blockSize = Math.Min(segmentSize, blobLengthRemaining);
byte[] blobContents = new byte[blockSize];
using (MemoryStream ms = new MemoryStream())
{
blob.DownloadRangeToStream(ms, startPosition, blockSize);
ms.Position = 0;
ms.Read(blobContents, 0, blobContents.Length);
using (FileStream fs = new FileStream(saveFileName, FileMode.OpenOrCreate))
{
fs.Position = startPosition;
fs.Write(blobContents, 0, blobContents.Length);
}
}
startPosition += blockSize;
blobLengthRemaining -= blockSize;
}
while (blobLengthRemaining > 0);
}