# CSharp上传下载简单帮助文件FtpHelper
date: 2020-03-19 08:41:13
从网上搜了好几个，感觉这个最简单好用。
NuGet先搜到FluentFTP，加入项目，然后用此Helper。
```c#
using FluentFTP;
using System.IO;
using System.Net;
namespace ChemicalDrugs
{
class FtpHelper
{
private string ftphost;
private string user;
private string password;
private string localPath;
private string remotePath;
public FtpHelper(string loPath, string rePath)
{
ftphost = "ftp://b";
user = "";
password = "";
localPath = loPath;
remotePath = $"/htdocs/{rePath}";
}
public bool UploadFile()
{
try
{
using (FtpClient conn = new FtpClient())
{
conn.Host = ftphost;
conn.Credentials = new NetworkCredential(user, password);
using (FileStream fs = new FileStream(localPath, FileMode.Open))
{
//string path = localPath.Substring(localPath.LastIndexOf('\\') + 1);//取文件名
conn.Upload(fs, remotePath);
}
return true;
}
}
catch
{
return false;
}
}
public bool DownloadFile()
{
bool flag = false;
try
{
using (FtpClient conn = new FtpClient())
{
conn.Host = ftphost;
conn.Credentials = new NetworkCredential(user, password);
byte[] outBuffs;
flag = conn.Download(out outBuffs, remotePath);
string s = localPath.Substring(0, localPath.LastIndexOf('\\'));
Directory.CreateDirectory(s);//如果文件夹不存在就创建它
FileStream fs = new FileStream(localPath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
fs.Write(outBuffs, 0, outBuffs.Length);
//清空缓冲区、关闭流
fs.Flush();
fs.Close();
}
return flag;
}
catch
{
return false;
}
}
}
}
```