网络上基本都是FTPClient类操作FTP文件，对于加密的FTPS很少，折腾了很久，记录下来分享一下。

通过FTPS操作服务器文件中的文件，下面是上传和下载的方法。

string ftpIP = "";//FTP ip
string ftpUSER = "";//FTP 用户名
string ftpPWD = "";//FTP 密码

--下载文件方法体
FTPSClient client = new FTPSClient();
client.Connect(ftpIP,
    new NetworkCredential(ftpUSER, ftpPWD),
    ESSLSupportMode.CredentialsRequired | ESSLSupportMode.Implicit,
    new RemoteCertificateValidationCallback((a, b, c, d) => { return true; }));
client.SetTransferMode(ETransferMode.Binary);
client.SetTextEncoding(ETextEncoding.UTF8);

IList<DirectoryListItem> filelist = client.GetDirectoryList("/ABC/");
for (int i = 0; i < filelist.Count; i++)
{
    client.GetFile("/ABC/" + filelist[i].Name.ToString(), AppDomain.CurrentDomain.BaseDirectory + "Download\\" + filelist[i].Name.ToString());
    
}


--上传文件方法体
string sourcePath = AppDomain.CurrentDomain.BaseDirectory + "ABC\\";
FTPSClient client = new FTPSClient();
client.Connect(ftpIP,
    new NetworkCredential(ftpUSER, ftpPWD),
    ESSLSupportMode.CredentialsRequired | ESSLSupportMode.Implicit,
    new RemoteCertificateValidationCallback((a, b, c, d) => { return true; }));
client.SetTransferMode(ETransferMode.Binary);
client.SetTextEncoding(ETextEncoding.UTF8);

DirectoryInfo di = new DirectoryInfo(sourcePath + "\\");
FileInfo[] files = di.GetFiles();
for (int i = 0; i < files.Length; i++)
{
    client.PutFile(sourcePath + "\\" + files[i].Name, "/ABC/" + files[i].Name);

    //删除原文件
    File.Copy(sourcePath + "\\" + files[i].Name, sourcePath + "_Bak\\" + files[i].Name, true);
    File.Delete(sourcePath + "\\" + files[i].Name);
}