从ftp目录读取xml文件-C＃

我想从ftp远程目录中读取文件。每天我都将FTP文件夹放入100个文件之类的文件中，并且每天要读取所有文件并将数据推送到数据库。

但是，当我尝试读取文件时，出现错误：

System.NotSupportedException：'给定路径的格式不是   支持的。'

我的文件存储在ftp中，我尝试访问完整路径以读取文件，如示例所示：

ftp://dmo.someftpurl.ie:311/Directory-Test/in/demofile_measurement2020.xml

这是我到目前为止所做的（请阅读代码注释）：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Xml;

namespace FtpReader
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> ftpFiles = new List<string>(); // List where I will store all file names

            #region Credentials & Connection // Accessing FTP folder

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://dmo.someftpurl.ie:311/Directory-Test/in/");
            request.Method = WebRequestMethods.Ftp.ListDirectory;
            request.Credentials = new NetworkCredential("someUsername", "somePassword");

            #endregion

            #region Getting file lists from Ftp // Here I get list of all files available in ftp directory

            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    var line = reader.ReadLine();
                    while (line != null)
                    {
                        var split = line.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
                        var fileName = split[split.Length - 1];
                        if (!string.IsNullOrWhiteSpace(fileName))
                        {
                            ftpFiles.Add(fileName);
                        }
                        line = reader.ReadLine();
                    }
                }
            }

            #endregion

            #region Reading file by file as XML // Here I've tried reading xml file from ftp directory

            if(ftpFiles.Any())
            {
                foreach(var item in ftpFiles)
                {
                    var item_path = "ftp://dmo.someftpurl.ie:311/Directory-Test/in/" + item; // ftp://dmo.someftpurl.ie:311/Directory-Test/in/demofile_measurement2020.xml
                    XmlDataDocument xmldoc = new XmlDataDocument();
                    XmlNodeList xmlnode;
                    string str = null;
                    FileStream fs = new FileStream(item_path, FileMode.Open, FileAccess.Read); // Here is where app breaks 
                    xmldoc.Load(fs);
                    xmlnode = xmldoc.GetElementsByTagName("myCustomNode");
                    for (int i = 0; i <= xmlnode.Count - 1; i++)
                    {

                    }
                }               
            }

            #endregion
        }
    }
}