如何在C#中请求一个文件？

using System;
using System.Net;

class Program
{
    static void Main()
    {
        string url = "https://example.com/file.txt"; // 文件的URL地址

        using (WebClient client = new WebClient())
        {
            try
            {
                string content = client.DownloadString(url); // 发起GET请求并获取文件内容
                Console.WriteLine(content);
            }
            catch (WebException ex)
            {
                Console.WriteLine("请求文件时发生错误：" + ex.Message);
            }
        }
    }
}