c#如何上传大文件到ftp站点

本文关键字：文件 ftp 站点 | 更新日期: 2023-09-27 18:09:42

我正在开发一个windows应用程序备份(文件和sql server数据库)。现在我需要把这些文件(.rar文件)上传到我的ftp站点。对于上传，我使用以下代码:

string file = "D:''RP-3160-driver.zip";
//opening the file for read.
string uploadFileName = "", uploadUrl = "";
uploadFileName = new FileInfo(file).Name;
uploadUrl = "ftp://ftp.Sitename.com/tempFiles/";
FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read);
try
{
   long FileSize = new FileInfo(file).Length; // File size of file being uploaded.
   Byte[] buffer = new Byte[FileSize];
   fs.Read(buffer, 0, buffer.Length);
   fs.Close();
   fs = null;
   string ftpUrl = string.Format("{0}/{1}", uploadUrl, uploadFileName);
   FtpWebRequest requestObj = FtpWebRequest.Create(ftpUrl) as FtpWebRequest;
   requestObj.Method = WebRequestMethods.Ftp.UploadFile;
   requestObj.Credentials = new NetworkCredential("usernam", "password");
   Stream requestStream = requestObj.GetRequestStream();
   requestStream.Write(buffer, 0, buffer.Length);
   requestStream.Flush();
   requestStream.Close();
   requestObj = null;
   MessageBox.Show("File upload/transfer Successed.", "Successed", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
   if (fs != null)
   {
      fs.Close();
   }
   MessageBox.Show("File upload/transfer Failed.'r'nError Message:'r'n" + ex.Message, "Successed", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

此代码只上传大小为<5 Mb。但是我需要上传大于500Mb到1Gb的文件。有谁能帮我吗?

c#如何上传大文件到ftp站点

对于较大的文件，您可以选择读取文件流并在读取时将其写入输出流。

FileStream fs = null;
Stream rs = null;
try 
{
    string file = "D:''RP-3160-driver.zip";
    string uploadFileName = new FileInfo(file).Name;
    string uploadUrl = "ftp://ftp.Sitename.com/tempFiles/";
    fs = new FileStream(file, FileMode.Open, FileAccess.Read);
    string ftpUrl = string.Format("{0}/{1}", uploadUrl, uploadFileName);
    FtpWebRequest requestObj = FtpWebRequest.Create(ftpUrl) as FtpWebRequest;
    requestObj.Method = WebRequestMethods.Ftp.UploadFile;
    requestObj.Credentials = new NetworkCredential("usernam", "password");
    rs = requestObj.GetRequestStream();
    byte[] buffer = new byte[8092];
    int read = 0;
    while ((read = fs.Read(buffer, 0, buffer.Length)) != 0)
    {
       rs.Write(buffer, 0, read);
    }
    rs.Flush();
}
catch (Exception exception) 
{
    MessageBox.Show("File upload/transfer Failed.'r'nError Message:'r'n" + exception.Message, "Succeeded", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally 
{
    if (fs != null)
    {
        fs.Close();
        fs.Dispose();
    }
    if (rs != null)
    {
        rs.Close();
        rs.Dispose();
    }
}

Stream类有一个很好的方法CopyTo

你不需要从/到流读写。只用fs.CopyTo(requestStream);

使用此方法，您不必声明像new Byte[FileSize];

这样的大型数组。
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