如何使用C#从FTP中读取CSV文件

Question

我可以通过身份验证，但我不确定如何读取CSV文件。链接通常从硬盘驱动器，我是这样读的。

string[] allLines = System.IO.File.ReadAllLines(@"D:\CSV\data.csv");

但是我怎么才能从ftp中读取。我的Ftp路径类似于ftp://ftp.atozfdc.com.au/data.csv，这里是我通过ftp身份验证的代码。

String ftpserver = "ftp://ftp.atozfdc.com.au/data.csv";
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpserver));
reqFTP.UsePassive = false;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential("username", "password");
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.Proxy = GlobalProxySelection.GetEmptyWebProxy();
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

Answer 1

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
//use the response like below
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
string[] allLines = reader.ReadToEnd().Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);

Answer 2

看看这个link

TextFieldParser位于Microsoft.VisualBasic.FileIO命名空间中。因此您需要添加对Microsoft.VisualBasic.dll的引用

String path = @"D:\CSV\data.csv";

using (TextFieldParser parser = new TextFieldParser(path))
{
    parser.SetDelimiters(new string[] { "," });
    parser.HasFieldsEnclosedInQuotes = true;

    // if you want to skip over header line., uncomment line below
    // parser.ReadLine();

    while (!parser.EndOfData)
    {
        string[] fields = parser.ReadFields();
        column1 = fields[0];
        column2 = fields[1];
        column3 = int.Parse(fields[2]);
        column4 = double.Parse(fields[3]);
    }
}

我建议您将文件下载到临时位置，然后使用临时文件路径来解析CSV。

但如果您不想创建临时文件，请尝试使用ResponseStream

示例：

String ftpserver = "ftp://ftp.atozfdc.com.au/data.csv";
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpserver));
reqFTP.UsePassive = false;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential("username", "password");
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.Proxy = GlobalProxySelection.GetEmptyWebProxy();
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();


Stream responseStream = response.GetResponseStream();
// use the stream to read file from remote location

using (TextFieldParser parser = new TextFieldParser(responseStream))
{
    // usual csv reader implementation
}

responseStream.Close();
response.Close(); //Closes the connection to the server

Answer 3

这是你的ftp://ftp.atozfdc.com.au/data.csv文件路径。你还在找什么？如果您想要读取该文件，则使用

StreamReader reader = new StreamReader(responseStream);
string[] allLines = reader.ReadToEnd().Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries)