主题：[求助]文件需要从FTP与本地目录比对并下载文件

Dim ftp1 As New FtpClient

Dim fls As List(of String)

ftp1.Host="FTP地址"

ftp1.Account = "用户名"

ftp1.Password = "密码"

fls = ftp1.GetFileList("\gaoshengde\dingdan\")

For Each fl As String In fls

    Output.Show(FileSys.GetName(fl))

Next

我的问题是如何让这两个数组进行对比出本地文件没有的.则下载它;