[英]Download large files using ftp protocol
我知道这可能不是第一次。 但是我找不到解决问题的办法。
private void bgftpdownload_DoWork(object sender, DoWorkEventArgs e)
{
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpurl + "/" + clientlabel.Text + "/data.7z");
request.Credentials = new NetworkCredential(ftpuser, ftppass);
request.Method = WebRequestMethods.Ftp.GetFileSize;
request.Proxy = null;
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
long fileSize = response.ContentLength;
request = (FtpWebRequest)WebRequest.Create(ftpurl + "/" + clientlabel.Text + "/data.7z");
request.Credentials = new NetworkCredential(ftpuser, ftppass);
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (FtpWebResponse responseFileDownload = (FtpWebResponse)request.GetResponse())
using (Stream responseStream = responseFileDownload.GetResponseStream())
using (FileStream writeStream = new FileStream(LocationFile, FileMode.Create))
{
int Length = 2048;
Byte[] buffer = new Byte[Length];
int bytesRead = responseStream.Read(buffer, 0, Length);
int bytes = 0;
while (bytesRead > 0)
{
writeStream.Write(buffer, 0, bytesRead);
bytesRead = responseStream.Read(buffer, 0, Length);
bytes += bytesRead;
int totalSize = (int)(fileSize / 1048576);
bgftpdownload.ReportProgress((bytes / 1048576) * 100 / totalSize, totalSize);
}
}
}
private void bgftpdownload_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progresslabel.Text = e.ProgressPercentage * (int)e.UserState / 100 + " Mb / " + e.UserState + " Mb";
progressBar1.Value = e.ProgressPercentage;
}
我有这段代码,它的工作很棒..直到它在ftp服务器上命中了2 gb文件
我可以在其他论坛上阅读,(int)的值限制为= 2147483591,因此该问题已解决,原因是我的字节变得高于限制(2147483591)
System.Windows.Forms.dll中发生类型为'System.ArgumentOutOfRangeException'的异常,但未在用户代码中处理
附加信息:Værdien'-45'er ugyldig表示'Value'。 '价值'skalværemellem'最小'或'最大'。
我该怎么做才能解决此问题?
您的进度条正在触发失败,尝试将其设置为-45,这是无效的。
int totalSize = (int)(fileSize / 1048576);
bgftpdownload.ReportProgress((bytes / 1048576) * 100 / totalSize, totalSize);
您在totalSize上出现溢出,这导致负%,这将导致您看到的错误。
...至少我认为那是错的。
long bytes = 0;
和
bgftpdownload.ReportProgress((int)(bytes / 1048576) * 100 / totalSize, totalSize);
是解决方案,我将(int)放在ReportProgress的错误位置。
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