【C#】.NET中设置代理服务器浏览网页的实现--转载

目前很多种类的浏览器中都有代理服务器的设置，用户可以通过浏览器自定义更换自己的IP，实现在线代理翻(河蟹)墙浏览网页。

而在.NET中，亦可以通过调用API函数InternetSetOption来实现自定义代理IP的设置。。

首先引用System.Runtime.InteropServices名字空间：

using System.Runtime.InteropServices;

接着引入"wininet.dll"库文件，并定义IP代理设置方法：

 #region 在线代理
         public struct Struct_INTERNET_PROXY_INFO
         {
             public int dwAccessType;
             public IntPtr proxy;
             public IntPtr proxyBypass;
         };
         /// <summary>
         /// 定义API函数
         /// </summary>
         /// <param name="hInternet"></param>
         /// <param name="dwOption"></param>
         /// <param name="lpBuffer"></param>
         /// <param name="lpdwBufferLength"></param>
         /// <returns></returns>
         [DllImport("wininet.dll", SetLastError = true)]
         private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

         /// <summary>
         /// 刷新代理IP设置
         /// </summary>
         /// <param name="strProxy"></param>
         private void RefreshIESettings(string strProxy)
         {
             const int INTERNET_OPTION_PROXY = ;
             const int INTERNET_OPEN_TYPE_PROXY = ;

             Struct_INTERNET_PROXY_INFO struct_IPI;

             // Filling in structure
             struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
             struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
             struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");

             // Allocating memory
             IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));

             // Converting structure to IntPtr
             Marshal.StructureToPtr(struct_IPI, intptrStruct, true);

             bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));
         }

         /// <summary>
         /// 在线代理访问网页URL
         /// </summary>
         /// <param name="ip">代理IP</param>
         /// <param name="port">代理端口</param>
         /// <param name="url">要访问的网页URL</param>
         private void NaviByProxy(string ip, string port, string url)
         {
             ListViewItem item = this.lst.SelectedItems[];
             //this.listView_usr.Items.Remove(item);

             RefreshIESettings(string.Format("{0}:{1}", ip, port));

             System.Object nullObject = ;
             string strTemp = String.Empty;
             System.Object nullObjStr = strTemp;
             this.wbCnblog.Navigate(url);
         }

         #endregion

 调用NaviByProxy该方法，代理浏览网页：
                 if (lst.SelectedItems.Count > )
                 {
                     //代理游览网站URL
                     NaviByProxy(
                         lst.SelectedItems[].SubItems[].Text, //选中的代理IP地址
                         lst.SelectedItems[].SubItems[].Text, //选中的代理IP的端口
                         textBox_url.Text.Trim()//url地址
                         );
                 }
                 else wbCnblog.Navigate(textBox_url.Text);

实际效果：

转自：http://www.189works.com/article-41653-1.html