将文件从FTP直接传输到C#中的Azure Blob存储 [英] Transferring files from FTP directly to Azure Blob storage in C#
问题描述
我编写了一个将文件从FTP服务器移动到Azure Blob存储的功能.我想将流从FTP传递到Blob,以便可以上传文件.我正在为每个文件运行while循环,并尝试使用 UploadFromStreamAsync()
将文件移至Blob存储.但是,当我进行此调用时,我的流对象被处置了,因为哪个文件正在传输到blob,但是没有任何内容.在所有文件传输完毕之前,我不希望处置流对象.谁能告诉我怎么了吗?
I have written a function which move files from FTP server to Azure Blob storage. I want to pass the stream from FTP to blob so that I can upload the files. I am running a while loop for every file and trying to move the file to blob storage using UploadFromStreamAsync()
. But when I came to this call, my stream object gets disposed because of which file is getting transfer to blob but without any content. I do not want to dispose my stream object till all files are transfer. Can anyone tell me what's wrong going on??
public static async Task FTP_TO_BLOB_TRANSFER()
{
string ftpPath = ConfigurationSettings.AppSettings.Get("ftpPath");
string ftpUserName = ConfigurationSettings.AppSettings.Get("ftpUserName");
string ftpPassword = ConfigurationSettings.AppSettings.Get("ftpPassword");
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpPath);
request.Method = WebRequestMethods.Ftp.ListDirectory;
request.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
string connectionString = ConfigurationSettings.AppSettings.Get("connectionString");
string folderName = "Inbox/";
string file = reader.ReadLine();
while (!string.IsNullOrEmpty(file))
{
string fileName = Path.GetFileNameWithoutExtension(file);
string guid = Guid.NewGuid().ToString();
string extension = Path.GetExtension(file);
try
{
Stream fileForBlobStorage = reader.BaseStream;
if (CloudStorageAccount.TryParse(connectionString, out storageAccount))
{
CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("falcon");
BlobContainerPermissions permissions = new BlobContainerPermissions
{
PublicAccess = BlobContainerPublicAccessType.Blob
};
await cloudBlobContainer.SetPermissionsAsync(permissions);
CloudBlockBlob cloudBlockBlob = cloudBlobContainer.GetBlockBlobReference(folderName + fileName + "-" + '[' + guid + ']' + guid + extension.ToString());
await cloudBlockBlob.UploadFromStreamAsync((Stream )fileForBlobStorage);
}
else
{
Console.WriteLine("Connection string not defined.");
}
}
catch (Exception e)
{
string message = e.Message;
Console.WriteLine(message);
}
file = reader.ReadLine();
}
}
推荐答案
您正在请求FTP服务器上的文件夹的目录列表.而与此同时,您也可以使用列表:
You are requesting directory listing of a folder on FTP server. And with the listing you are, at the same time:
- 逐行读取列表(逐个文件)–以某种方式尝试处理各个行/文件.
- 但是,您正在尝试将列表(相同的流)上传到Blob.
那永远都行不通.而且这没有任何意义.
That can never work. And moreover it makes no sense.
我假设您实际上是要上传文件,而不是列表.
I assume that you actually want to upload the files, not the listing.
为此,您需要开始从循环中的FTP服务器下载单个文件:
For that you need to start downloading the individual files from the FTP server in your loop:
FtpWebRequest fileRequest = (FtpWebRequest)WebRequest.Create(ftpPath + file);
fileRequest.Method = WebRequestMethods.Ftp.DownloadFile;
fileRequest.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
FtpWebResponse fileResponse = (FtpWebResponse)fileRequest.GetResponse();
Stream fileStream = fileResponse.GetResponseStream();
await cloudBlockBlob.UploadFromStreamAsync(fileStream);
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