C#使用WebClient下载文件到本地目录

亦凉 2021-09-12 06:56 493阅读 0赞

C\#使用WebClient下载文件到本地目录。

**1、配置本地目录路径**

**2、创建FileHandler.cs类，编写下载代码**

/// <summary>
    /// 文件处理类
    /// </summary>
    public static class FileHandler
    {
        /// <summary>
        /// 文件下载目录
        /// </summary>
        private static string _directory = @ConfigurationSettings.AppSettings["Download_Dic"];
    
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="url">下载地址</param>
        /// <returns>文件名称</returns>
        public static string DownloadFile(string url)
        {
            try
            {
                string fileName = CreateFileName(url);
                if (!Directory.Exists(_directory))
                {
                    Directory.CreateDirectory(_directory);
                }
                WebClient client = new WebClient();
                client.DownloadFile(url, _directory + fileName);
                return fileName;
            }
            catch
            {
                return "";
            }
        }
    
        /// <summary>
        /// 创建文件名称
        /// </summary>
        public static string CreateFileName(string url)
        {
            string fileName = "";
            string fileExt = url.Substring(url.LastIndexOf(".")).Trim().ToLower();
            Random rnd = new Random();
            fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + rnd.Next(10, 99).ToString() + fileExt;
            return fileName;
        }
    
    }

**3、调用测试**

static void Main(string[] args)
    {
        string url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1494677827304&di=8e8aaf1a717ae37b73b772ee4728c7ea&imgtype=0&src=http%3A%2F%2Fscimg.jb51.net%2Fallimg%2F141123%2F10-1411231F92W16.jpg";
        string fileName = FileHandler.DownloadFile(url);
        if (!String.IsNullOrEmpty(fileName))
        {
            Console.WriteLine("文件下载成功，文件名称：" + fileName);
        }
        else
        {
            Console.WriteLine("文件下载失败");
        }    
        Console.ReadLine();
    }