我必须将文件从FTP传输到Azure文件存储。我的代码工作正常，但我在内存中传输这些文件并不是最佳做法。首先，我将流读取到内存中的Byte数组。然后我将输出上传到Azure文件存储。
现在我知道最好这样做是异步的。但我不知道这是否可能，以及如何做到这一点。
我的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.WindowsAzure.Storage;
using System.Configuration;
using Microsoft.WindowsAzure.Storage.File;
using System.IO;
using Microsoft.Azure;
using System.Net;
namespace TransferFtpToAzure
{
class Program
{
public static void Main(string[] args)
{
List<FileName> sourceFileList = new List<FileName>();
List<FileName> targetFileList = new List<FileName>();
string targetShareReference = ConfigurationManager.AppSettings["AzureShare"];
string targetDirectoryReference = ConfigurationManager.AppSettings["Environment"] + "/" + Enums.AzureFolders.Mos + "/" + Enums.AzureFolders.In;
string sourceURI = (ConfigurationManager.AppSettings["FtpConnectionString"] + ConfigurationManager.AppSettings["Environment"].ToUpper() +"/"+ Enums.FtpFolders.Mos + "/").Replace("\\","/");
string sourceUser = ConfigurationManager.AppSettings["FtpServerUserName"];
string sourcePass = ConfigurationManager.AppSettings["FtpServerPassword"];
getFileLists(sourceURI, sourceUser, sourcePass, sourceFileList, targetShareReference, targetDirectoryReference, targetFileList);
Console.WriteLine(sourceFileList.Count + " files found!");
CheckLists(sourceFileList, targetFileList);
targetFileList.Sort();
Console.WriteLine(sourceFileList.Count + " unique files on sourceURI" + Environment.NewLine + "Attempting to move them.");
foreach (var file in sourceFileList)
{
try
{
CopyFile(file.fName, sourceURI, sourceUser, sourcePass, targetShareReference, targetDirectoryReference);
}
catch
{
Console.WriteLine("There was move error with : " + file.fName);
}
}
}
public class FileName : IComparable<FileName>
{
public string fName { get; set; }
public int CompareTo(FileName other)
{
return fName.CompareTo(other.fName);
}
}
public static void CheckLists(List<FileName> sourceFileList, List<FileName> targetFileList)
{
for (int i = 0; i < sourceFileList.Count; i++)
{
if (targetFileList.BinarySearch(sourceFileList[i]) > 0)
{
sourceFileList.RemoveAt(i);
i--;
}
}
}
public static void getFileLists(string sourceURI, string sourceUser, string sourcePass, List<FileName> sourceFileList, string targetShareReference, string targetDirectoryReference, List<FileName> targetFileList)
{
string line = "";
/////////Source FileList
FtpWebRequest sourceRequest;
sourceRequest = (FtpWebRequest)WebRequest.Create(sourceURI);
sourceRequest.Credentials = new NetworkCredential(sourceUser, sourcePass);
sourceRequest.Method = WebRequestMethods.Ftp.ListDirectory;
sourceRequest.UseBinary = true;
sourceRequest.KeepAlive = false;
sourceRequest.Timeout = -1;
sourceRequest.UsePassive = true;
FtpWebResponse sourceRespone = (FtpWebResponse)sourceRequest.GetResponse();
//Creates a list(fileList) of the file names
using (Stream responseStream = sourceRespone.GetResponseStream())
{
using (StreamReader reader = new StreamReader(responseStream))
{
line = reader.ReadLine();
while (line != null)
{
var fileName = new FileName
{
fName = line
};
sourceFileList.Add(fileName);
line = reader.ReadLine();
}
}
}
/////////////Target FileList
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
CloudFileClient fileClient = storageAccount.CreateCloudFileClient();
//var test = fileClient.ListShares();
CloudFileShare fileShare = fileClient.GetShareReference(targetShareReference);
if (fileShare.Exists())
{
CloudFileDirectory rootDirectory = fileShare.GetRootDirectoryReference();
if (rootDirectory.Exists())
{
CloudFileDirectory customDirectory = rootDirectory.GetDirectoryReference(targetDirectoryReference);
if (customDirectory.Exists())
{
var fileCollection = customDirectory.ListFilesAndDirectories().OfType<CloudFile>();
foreach (var item in fileCollection)
{
var fileName = new FileName
{
fName = item.Name
};
targetFileList.Add(fileName);
}
}
}
}
}
public static void CopyFile(string fileName, string sourceURI, string sourceUser, string sourcePass, string targetShareReference, string targetDirectoryReference)
{
try
{
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(sourceURI + fileName);
request.Method = WebRequestMethods.Ftp.DownloadFile;
request.Credentials = new NetworkCredential(sourceUser, sourcePass);
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
Upload(fileName, ToByteArray(responseStream), targetShareReference, targetDirectoryReference);
responseStream.Close();
}
catch
{
Console.WriteLine("There was an error with :" + fileName);
}
}
public static Byte[] ToByteArray(Stream stream)
{
MemoryStream ms = new MemoryStream();
byte[] chunk = new byte[4096];
int bytesRead;
while ((bytesRead = stream.Read(chunk, 0, chunk.Length)) > 0)
{
ms.Write(chunk, 0, bytesRead);
}
return ms.ToArray();
}
public static bool Upload(string FileName, byte[] Image, string targetShareReference, string targetDirectoryReference)
{
try
{
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
CloudFileClient fileClient = storageAccount.CreateCloudFileClient();
//var test = fileClient.ListShares();
CloudFileShare fileShare = fileClient.GetShareReference(targetShareReference);
if (fileShare.Exists())
{
CloudFileDirectory rootDirectory = fileShare.GetRootDirectoryReference();
if (rootDirectory.Exists())
{
CloudFileDirectory customDirectory = rootDirectory.GetDirectoryReference(targetDirectoryReference);
if (customDirectory.Exists())
{
var cloudFile = customDirectory.GetFileReference(FileName);
using (var stream = new MemoryStream(Image, writable: false))
{
cloudFile.UploadFromStream(stream);
}
}
}
}
return true;
}
catch
{
return false;
}
}
}
}
答案 0 :(得分：1)
如果我理解正确，您希望避免在下载和上传之间将文件存储在内存中。
我不认为这是可能的。虽然CloudFile.UploadFromStream需要Stream，但它需要一个可搜索的流，FtpWebResponse.GetResponseStream返回的流不是。
有可能使用＆＃34;追加blob＆＃34;用块来上传文件。
答案 1 :(得分：0)
使用Azure存储文件共享，这是它对我有用的唯一方式，无需将整个ZIP加载到内存中。我使用3GB ZIP文件（包含数千个文件或一个大文件）进行了测试，并且内存/ CPU较低且稳定。希望对您有所帮助！
var zipFiles = _directory.ListFilesAndDirectories()
.OfType<CloudFile>()
.Where(x => x.Name.ToLower().Contains(".zip"))
.ToList();
foreach (var zipFile in zipFiles)
{
using (var zipArchive = new ZipArchive(zipFile.OpenRead()))
{
foreach (var entry in zipArchive.Entries)
{
if (entry.Length > 0)
{
CloudFile extractedFile = _directory.GetFileReference(entry.Name);
using (var entryStream = entry.Open())
{
byte[] buffer = new byte[16 * 1024];
using (var ms = extractedFile.OpenWrite(entry.Length))
{
int read;
while ((read = entryStream.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
}
}
}
}
}
}