FTP上传时检查文件是否存在,是否在C#中重命名

Question

我有一个关于使用C#上传到FTP的问题.

我想要做的是,如果文件存在,那么我想添加像文件名后面的复制或1,所以它不会替换文件.有任何想法吗？

var request = (FtpWebRequest)WebRequest.Create(""+destination+file);
request.Credentials = new NetworkCredential("", "");
request.Method = WebRequestMethods.Ftp.GetFileSize;

try
{
    FtpWebResponse response = (FtpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
    FtpWebResponse response = (FtpWebResponse)ex.Response;
    if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
    {

    }
}

Answer 1

我把它扔在一起并不是特别优雅,但我想这几乎是你所需要的？

你只是想继续尝试你的请求,直到你得到一个"ActionNotTakenFileUnavailable",所以你知道你的文件名是好的,然后只需上传它.

        string destination = "ftp://something.com/";
        string file = "test.jpg";
        string extention = Path.GetExtension(file);
        string fileName = file.Remove(file.Length - extention.Length);
        string fileNameCopy = fileName;
        int attempt = 1;

        while (!CheckFileExists(GetRequest(destination + "//" + fileNameCopy + extention)))
        {
            fileNameCopy = fileName + " (" + attempt.ToString() + ")";
            attempt++;
        }

        // do your upload, we've got a name that's OK
    }

    private static FtpWebRequest GetRequest(string uriString)
    {
        var request = (FtpWebRequest)WebRequest.Create(uriString);
        request.Credentials = new NetworkCredential("", "");
        request.Method = WebRequestMethods.Ftp.GetFileSize;

        return request;
    }

    private static bool checkFileExists(WebRequest request)
    {
        try
        {
            request.GetResponse();
            return true;
        }
        catch
        {
            return false;
        }
    }

编辑:已更新,因此这适用于任何类型的Web请求,并且稍微有点苗条.