Web下载文件

IE浏览器在打开swf、wma等文件的时候会自动打开，如果想下载到本地存储就不太方便，为此我自己做一个小程序用来下载文件，

由于我在局域网内使用代理服务器上网，所以下载文件还需要通过代理设置。

程序截图：

下载按钮事件的代码：

private void buttonDownload_Click(object sender, EventArgs e)

        {

            TIMMS.DATA.TWebClient wc = new TIMMS.DATA.TWebClient();

            if (checkBox1.Checked)

            {

                wc.ProxyUserName = textBoxUsername.Text;

                wc.ProxyPassword = textBoxPassword.Text;

                wc.ProxyDomainName = textBoxDomainname.Text;

            }

            wc.ProxyUrl = textBoxUrl.Text;

            SaveFileDialog saveFileDialog = new SaveFileDialog();

            int indexof=textBoxUrl.Text.LastIndexOf("/")+1;

            int length=textBoxUrl.Text.Length;

            string filename=textBoxUrl.Text.Substring(indexof, (length - indexof));

            string file_extension = System.IO.Path.GetExtension(filename);

            saveFileDialog.FileName = filename;

            saveFileDialog.Filter = "文件 (*" + file_extension + ")|*" + file_extension + "|所有文件|*.*";

            if (saveFileDialog.ShowDialog() == DialogResult.OK)

                wc.FileName = saveFileDialog.FileName;

            string errmsg="";

            Cursor.Current = Cursors.WaitCursor;

            buttonDownload.Enabled = false;

            if (!wc.GetFile(out errmsg))

                MessageBox.Show(errmsg, "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                buttonDownload.Enabled = true;

                Cursor.Current = Cursors.Default;

                return;

            buttonDownload.Enabled = true;

            Cursor.Current = Cursors.Default;

            MessageBox.Show("下载完成！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information );

        }

 TIMMS.DATA.TWebClient ：

using System;

using System.Collections.Generic;

using System.Text;

using System.Net;

namespace TIMMS.DATA

{

   public  class TWebClient

    {

      /// <summary>

      /// 供向 URI 标识的资源发送数据和从 URI 标识的资源接收数据的公共方法

      /// </summary>

       public TWebClient() { }

       /// <summary>

       /// TWebClient构造函数

       /// </summary>

       /// <param name="user">代理服务器用户名</param>

       /// <param name="password">代理服务器登录密码</param>

       /// <param name="domainName">代理服务器域名</param>

       /// <param name="Address">代理服务器地址</param>

       /// <param name="url">需要下载的Web文件路径</param>

       /// <param name="filename">保存到本地的文件名</param>

       public  TWebClient(string user,string password,string domainName,string Address,string url,string filename)

       {

           proxyUser=user;

           ProxyPassword=password;

           proxyDomainName=domainName;

           proxyAddress = Address;

           proxyUrl = url;

           fileName = filename;

       }

       ///  TWebClient构造函数，使用IE默认代理设置

       public  TWebClient(string user, string password, string domainName, string url, string filename)

           proxyUser = user;

           ProxyPassword = password;

           proxyDomainName = domainName;

       /// WebClient构造函数，使用IE默认代理设置

       public  TWebClient(string user, string password, string domainName)

       public TWebClient(string url, string filename)

        private  string proxyUser = "";

        /// <summary>

        /// 代理服务器用户名

        /// </summary>

        public  string ProxyUserName

            get { return proxyUser; }

            set { proxyUser = value; }

        private  string proxyPassword = "";

        /// 代理服务器用户密码

        public  string ProxyPassword

            get { return proxyPassword; }

            set { proxyPassword = value; }

        private  string proxyDomainName = "";

        /// 代理服务器域名

        public  string ProxyDomainName

            get { return proxyDomainName; }

            set { proxyDomainName = value; }

        private  string proxyAddress;

        /// 默认与IE设置相同

        public  string ProxyAddress

            get { return proxyAddress; }

            set { proxyAddress = value; }

        public  string ProxyUrl

            get { return proxyUrl; }

            set { proxyUrl = value; }

       private  string fileName = "";

       /// 下载文件的文件名（包含路径）@"d:\baidu_logo.gif";

        public  string FileName

            get { return fileName; }

            set { fileName = value; }

       /// 根据TWebClient设置获取并保存文件

       /// <param name="errmsg"></param>

       /// <returns></returns>

        public  bool GetFile(out string errmsg)

            try

                WebClient wc = new WebClient();

                WebProxy proxy = WebProxy.GetDefaultProxy();//获取IE缺省设置

                //如果缺省设置为空，则有可能是根本不需要代理服务器，如果此时配置文件中也未配置则认为不需Proxy

                if (proxy.Address == null && proxyAddress != null && proxyAddress != "")

                    proxy.Address = new Uri(proxyAddress);//按配置文件创建Proxy 地置

                if (proxy.Address != null)//如果地址为空，则不需要代理服务器

                {

                    proxy.Credentials = new NetworkCredential(proxyUser, proxyPassword, proxyDomainName);//从配置封装参数中创建

                    wc.Proxy = proxy;//request.Proxy = proxy;//赋予 request.Proxy 

                }

                wc.DownloadFile(proxyUrl, fileName);//下载文件并保存

                errmsg = "OK";

                return true;

            catch (Exception ex)

                errmsg = ex.Message;

                return false;

        ///  根据TWebClient设置获取并保存文件

        /// <param name="url">需要下载的Web文件路径</param>

        /// <param name="filename">保存到本地的文件名</param>

       /// <param name="errmsg">错误消息</param>

       /// <returns>成功true/失败false</returns>

       public bool GetFile(string url, string filename,out string errmsg)

           return GetFile(out errmsg);

    }

}

本文转自tiasys博客园博客，原文链接：http://www.cnblogs.com/tiasys/archive/2010/08/09/1795858.html，如需转载请自行联系原作者