英文:
Cannot download blob storage file to memory stream
问题
我正在尝试从 Blob 存储中下载文件到流。下面的代码执行两个操作：下载到文件和下载到流，但只有下载到文件的部分有效。
var connectionString = "...";
var fileMetaData = await dbService.GetFileMetaDataAsync(fileId);
var storageAccount = CloudStorageAccount.Parse(connectionString);
var blobClient = storageAccount.CreateCloudBlobClient();
var container = blobClient.GetContainerReference(fileMetaData.ProjectCode);
var blobPath = "test/test.csv";
var reference = container.GetBlobReference(blobPath);
var memoryStream = new MemoryStream();
try
{
await reference.DownloadToStreamAsync(memoryStream);
await reference.DownloadToFileAsync("C:\\temp\\test.csv", FileMode.Create);
}
catch (RequestFailedException)
{
logger.LogError($"无法下载 Blob：{blobPath}");
throw;
}
当我尝试使用 StreamReader 从内存流中读取时，内存流是空的。我不太喜欢下载到临时文件然后再次读取的想法。感谢您的帮助。
英文:
I am trying to download a file from blob storage into the stream. This code below does two things: download to a file and download to stream, only the download to file part works.
var connectionString = "..."
var fileMetaData = await dbService.GetFileMetaDataAsync(fileId);
var storageAccount = CloudStorageAccount.Parse(connectionString);
var blobClient = storageAccount.CreateCloudBlobClient();
var container = blobClient.GetContainerReference(fileMetaData.ProjectCode);
var blobPath = $"test/test.csv";
var reference = container.GetBlobReference(blobPath);
var memoryStream = new MemoryStream();
try
{
await reference.DownloadToStreamAsync(memoryStream);
await reference.DownloadToFileAsync("C:\\temp\\test.csv", FileMode.Create);
}
catch (RequestFailedException)
{
logger.LogError($"Cannot download blob at {blobPath}");
throw;
}
The Memory stream is empty when I try to read from it with a StreamReader
I don't really like the idea of downloading to a temporary file and then read it again
Thanks for your help.
答案1
得分: 2
Using the method OpenReadAsync() solved my problem
使用方法 OpenReadAsync() 解决了我的问题
var stream = await reference.OpenReadAsync();
英文:
Using the method OpenReadAsync() solved my problem
var stream = await reference.OpenReadAsync();
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