我的代码有效,但ProgressBar
直接跳转到100%,下载将继续。当它完成后,会出现一个消息框来获取信息。
我已经改变了缓冲区大小,但这并不重要。
我在这里做错了什么?
这是我的代码:
void workerDOWN_DoWork(object sender, DoWorkEventArgs e)
{
string fileFullPath = e.Argument as String;
string fileName = Path.GetFileName(fileFullPath);
string fileExtension = Path.GetExtension(fileName);
label4.Invoke((MethodInvoker)delegate { label4.Text = "Downloading File.."; });
string ftpServerIP = "XXX";
string ftpUserName = "XXX";
string ftpPassword = "XXX";
try
{
//Datei vom FTP Server downloaden
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://" + ftpServerIP + "/" + fileName);
request.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(fileFullPath))
{
var buffer = new byte[32 * 1024];
int totalReadBytesCount = 0;
int readBytesCount;
while ((readBytesCount = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, readBytesCount);
totalReadBytesCount += readBytesCount;
var progress = (int)((float)totalReadBytesCount / (float)fileStream.Length * 100);
workerDOWN.ReportProgress((int)progress);
label3.Invoke((MethodInvoker)delegate { label3.Text = progress + " %"; });
}
}
}
catch (WebException ex)
{
FtpWebResponse response = (FtpWebResponse)ex.Response;
if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
{
MessageBox.Show("Datei nicht gefunden!", "Error");
}
}
e.Result = fileFullPath;
}
void workerDOWN_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
string fileFullPath = e.Result as String;
string fileName = Path.GetFileName(fileFullPath);
MessageBox.Show("Download erfolgreich!","Information");
progressBar1.Value = 0;
label3.Invoke((MethodInvoker)delegate { label3.Text = " "; });
label4.Invoke((MethodInvoker)delegate { label4.Text = " "; });
}
答案 0 :(得分:2)
使用带有WinForms进度条的FtpWebRequest
进行FTP下载的简单示例:
private void button1_Click(object sender, EventArgs e)
{
// Run Download on background thread
Task.Run(() => Download());
}
private void Download()
{
try
{
const string url = "ftp://ftp.example.com/remote/path/file.zip";
NetworkCredential credentials = new NetworkCredential("username", "password");
// Query size of the file to be downloaded
WebRequest sizeRequest = WebRequest.Create(url);
sizeRequest.Credentials = credentials;
sizeRequest.Method = WebRequestMethods.Ftp.GetFileSize;
int size = (int)sizeRequest.GetResponse().ContentLength;
progressBar1.Invoke(
(MethodInvoker)(() => progressBar1.Maximum = size));
// Download the file
WebRequest request = WebRequest.Create(url);
request.Credentials = credentials;
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\local\path\file.zip"))
{
byte[] buffer = new byte[10240];
int read;
while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, read);
int position = (int)fileStream.Position;
progressBar1.Invoke(
(MethodInvoker)(() => progressBar1.Value = position));
}
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
核心下载代码基于:
Upload and download a binary file to/from FTP server in C#/.NET
解释您的代码无效的原因:
fileStream.Length
- 它始终等于totalReadBytesCount
,因此progress
将始终为100。ftpStream.Length
,但无法阅读。 WebRequestMethods.Ftp.GetFileSize
。答案 1 :(得分:0)
如果不确切知道ProgressChanged
事件处理程序中的代码到底是什么,我认为您在* 100
之后无意中将括号放在进度计算中。
你可以试试这个:
var progress = (int)((float)totalReadBytesCount / (float)fileStream.Length) * 100;
答案 2 :(得分:0)
我现在有一个适合我的解决方案。
首先获得文件大小的想法很棒。 但是当我第一次查询文件大小时,Ftp服务器会抛出一个错误。像这样 FtpWebRequest error: 550 Size not allowed in ASCII mode
现在我首先下载一个虚拟文件来打开Connection ..见下文
感谢大家的支持。
伟大的社区。感谢。
void workerDOWN_DoWork(object sender, DoWorkEventArgs e)
{
string fileFullPath = e.Argument as String;
string fileName = Path.GetFileName(fileFullPath);
string fileExtension = Path.GetExtension(fileName);
label4.Invoke((MethodInvoker)delegate { label4.Text = "Downloading File.."; });
//FTP Download und Delete
string ftpServerIP = "XXX";
string ftpUserName = "XXXX";
string ftpPassword = "XXXXX";
try
{
// dummy download ftp connection for ftp server bug
FtpWebRequest DummyRequest = (FtpWebRequest)WebRequest.Create(("ftp://" + ftpServerIP + "/anyfile"));
DummyRequest.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
DummyRequest.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = DummyRequest.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(Path.GetDirectoryName(Application.ExecutablePath) + "\\anyfile"))
{
ftpStream.CopyTo(fileStream);
}
//delete downloaded test file
File.Delete(Path.GetDirectoryName(Application.ExecutablePath) + "\\anyfile");
// Query size of the file to be downloaded
FtpWebRequest sizeRequest = (FtpWebRequest)WebRequest.Create("ftp://" + ftpServerIP + "/" + fileName);
sizeRequest.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
sizeRequest.Method = WebRequestMethods.Ftp.GetFileSize;
var fileSize = sizeRequest.GetResponse().ContentLength;
//file download
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://" + ftpServerIP + "/" + fileName);
request.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(fileFullPath))
{
var buffer = new byte[32 * 1024];
int totalReadBytesCount = 0;
int readBytesCount;
while ((readBytesCount = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, readBytesCount);
totalReadBytesCount += readBytesCount;
var progress = (int)((float)totalReadBytesCount / (float)fileSize * 100);
workerDOWN.ReportProgress((int)progress);
label3.Invoke((MethodInvoker)delegate { label3.Text = progress + " %"; });
}
}
// delete file on ftp server
FtpWebRequest Delrequest = (FtpWebRequest)WebRequest.Create("ftp://" + ftpServerIP + "/" + fileName);
Delrequest.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
Delrequest.Method = WebRequestMethods.Ftp.DeleteFile;
FtpWebResponse Delresponse = (FtpWebResponse)Delrequest.GetResponse();
Delresponse.Close();
// message file deleted
richTextBox1.Invoke((MethodInvoker)delegate { richTextBox1.AppendText("System: " + fileName + " wurde auf dem Server gelöscht." + Environment.NewLine); });
}
catch (WebException ex)
{
FtpWebResponse response = (FtpWebResponse)ex.Response;
if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
{
MessageBox.Show("Datei nicht gefunden!", "Error");
}
}
e.Result = fileFullPath;
}
void workerDOWN_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
void workerDOWN_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
string fileFullPath = e.Result as String;
string fileName = Path.GetFileName(fileFullPath);
MessageBox.Show("Download erfolgreich!","Information");
progressBar1.Value = 0;
label3.Invoke((MethodInvoker)delegate { label3.Text = " "; });
label4.Invoke((MethodInvoker)delegate { label4.Text = " "; });
}