c#通过代理访问网络_总结

百度，google加自己理解后，将所得方法总结一下：

    方法1：修改注册表Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings下 ProxyEnable和ProxyServer。这种方法适用于局域网用户，拨号用户无效。

    

 1 public partial class Form1 : Form
 2    {       
 3
 4        //用于刷新注册表
 5        [DllImport(@"wininet",
 6        SetLastError = true,
 7        CharSet = CharSet.Auto,
 8        EntryPoint = "InternetSetOption",
 9        CallingConvention = CallingConvention.StdCall)]
10
11
12        public static extern bool InternetSetOption
13        (
14        int hInternet,
15        int dmOption,
16        IntPtr lpBuffer,
17        int dwBufferLength
18        );
19
20         private void btnStart_Click(object sender, EventArgs e)
21        {
22            RegistryKey pregkey;
23                pregkey = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);
24                if (pregkey == null)
25                {
26                    Console.WriteLine("键值不存在");
27                }
28                else
29                {
30                    pregkey.SetValue("ProxyEnable", 1);
31                    pregkey.SetValue("ProxyServer", "代理地址");
32                    //激活代理设置
33                    InternetSetOption(0, 39, IntPtr.Zero, 0);
34                    InternetSetOption(0, 37, IntPtr.Zero, 0);
35                    webBrowser1.Navigate(txtweb.Text, false);
36                    // System.Threading.Thread.Sleep(10000);
37                }
38        }
39}

方法2： 修改注册表Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Connections下以你拨号连接名为键的值，该键为二进制。这种方法适用于拨号用户。

    

public partial class FrmMain : Form
    {

[DllImport(@"wininet",
        SetLastError = true,
        CharSet = CharSet.Auto,
        EntryPoint = "InternetSetOption",
        CallingConvention = CallingConvention.StdCall)]


        public static extern bool InternetSetOption
        (
        int hInternet,
        int dmOption,
        IntPtr lpBuffer,
        int dwBufferLength
        );

//将值转换为注册表中的二进制值
public byte ChangeTobyte(char i)
        {
            byte key = 0;
            switch (i)
            {
                case '0': key = 48; break;
                case '1': key = 49; break;
                case '2': key = 50; break;
                case '3': key = 51; break;
                case '4': key = 52; break;
                case '5': key = 53; break;
                case '6': key = 54; break;
                case '7': key = 55; break;
                case '8': key = 56; break;
                case '9': key = 57; break;
                case '.': key = 46; break;
                case ':': key = 58; break;
                
            }
            return key;
        }

private void btnStart_Click(object sender, EventArgs e)
        {
             int i = ("代理地址").Length;
                byte[] key = new byte[50];
                char[] source = ("代理地址").ToCharArray();
                key[0] = 60;
                key[4] = 3;
                key[8] = 3;
                key[12] = (byte)i;
                for (int ii = 0; ii < source.Length; ii++)
                {
                    key[16 + ii] = ChangeTobyte(source[ii]);
                }
                string sDirectX = "";
                for (int k = 0; k < key.Length; k++)
                {
                    if (key[k] != 0)
                    {
                        sDirectX += key[k] + " ";
                    }
                }
                //MessageBox.Show(sDirectX);
                RegistryKey pregkey;
                pregkey = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Connections", true);
                if (pregkey == null)
                {
                    Console.WriteLine("键值不存在");
                }
                else
                {
                    pregkey.SetValue("拨号名字对应键值", key, RegistryValueKind.Binary);
                    //激活代理设置
                    InternetSetOption(0, 39, IntPtr.Zero, 0);
                    InternetSetOption(0, 37, IntPtr.Zero, 0);
                    webBrowser1.Navigate(txtweb.Text, false);
                    webBrowser1.Refresh();
                    
                }

        }
}

方法3： 使用c#自带的webproxy类，使用这种方法可以获得目标网站的响应，但我不会把这种响应用IE反馈出来，有高手帮个忙么？
网上的代码说是MSDN的：
    HttpWebRequest myWebRequest=(HttpWebRequest)WebRequest.Create("http://www.microsoft.com"/); 
    WebProxy myProxy=new WebProxy(); 
    // Obtain the 'Proxy' of the  Default browser.   
    myProxy=(WebProxy)myWebRequest.Proxy; 这行我编译不通过
    // Print the Proxy Url to the console. 
    Console.WriteLine("\nThe actual default Proxy settings are {0}",myProxy.Address); 
    try 
    { 
    Console.WriteLine("\nPlease enter the new Proxy Address that is to be set:"); 
    Console.WriteLine("(Example:http://myproxy.example.com:port/)"); 
    string proxyAddress; 
    proxyAddress =Console.ReadLine(); 
    if(proxyAddress.Length>0) 

    { 
    Console.WriteLine("\nPlease enter the Credentials "); 
    Console.WriteLine("Username:"); 
    string username; 
    username =Console.ReadLine(); 
    Console.WriteLine("\nPassword:"); 
    string password; 
    password =Console.ReadLine(); 
    // Create a new Uri object. 
    Uri newUri=new Uri(proxyAddress); 
    // Associate the newUri object to 'myProxy' object so that new myProxy settings can be set. 
    myProxy.Address=newUri; 
    // Create a NetworkCredential object and associate it with the Proxy property of request object. 
    myProxy.Credentials=new NetworkCredential(username,password); 
    myWebRequest.Proxy=myProxy; 
    } 
    Console.WriteLine("\nThe Address of the  new Proxy settings are {0}",myProxy.Address); 
    HttpWebResponse myWebResponse=(HttpWebResponse)myWebRequest.GetResponse();

我改了下：
    

            HttpWebRequest myWebRequest = (HttpWebRequest)WebRequest.Create（"http://www.123cha.com");
            WebProxy myProxy = new WebProxy("代理地址", true);
            try
            {
               
                Console.WriteLine("\nThe Address of the  new Proxy settings are {0}", myProxy.Address);
                HttpWebResponse myWebResponse = (HttpWebResponse)myWebRequest.GetResponse();
              
                webBrowser1.DocumentStream = myWebResponse.GetResponseStream();
             

            }
            catch { }

ps：插入代码让人用的真不爽啊....