百度，google加自己理解后，將所得方法總結一下：
????方法1：修改注冊表Software//Microsoft//Windows//CurrentVersion//Internet Settings下 ProxyEnable和ProxyServer。這種方法適用于局域網用戶，撥號用戶無效。
????
?1
?public?partial?class?Form1?:?Form
?2
????{???????
?3
?4????????//用于刷新注冊表
?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("鍵值不存在");
27
????????????????}
28????????????????else
29????????????????{
30????????????????????pregkey.SetValue("ProxyEnable",?1);
31????????????????????pregkey.SetValue("ProxyServer",?"代理地址");
32????????????????????//激活代理設置
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
}
?public?partial?class?Form1?:?Form?2
????{???????
????
?3
?4
????????//用于刷新注冊表?5
????????[DllImport(@"wininet",?6
????????SetLastError?=?true,?7
????????CharSet?=?CharSet.Auto,?8
????????EntryPoint?=?"InternetSetOption",?9
????????CallingConvention?=?CallingConvention.StdCall)]10
11
12
????????public?static?extern?bool?InternetSetOption13
????????(14
????????int?hInternet,15
????????int?dmOption,16
????????IntPtr?lpBuffer,17
????????int?dwBufferLength18
????????);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("鍵值不存在");27
????????????????}28
????????????????else29
????????????????{30
????????????????????pregkey.SetValue("ProxyEnable",?1);31
????????????????????pregkey.SetValue("ProxyServer",?"代理地址");32
????????????????????//激活代理設置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： 修改注冊表 Software//Microsoft//Windows//CurrentVersion//Internet Settings//Connections下以你撥號連接名為鍵的值，該鍵為二進制。這種方法適用于撥號用戶。
????
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????????);//將值轉換為注冊表中的二進制值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("鍵值不存在");????????????????}????????????????else????????????????{????????????????????pregkey.SetValue("撥號名字對應鍵值",?key,?RegistryValueKind.Binary);????????????????????//激活代理設置????????????????????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#自帶的 webproxy類，使用這種方法可以獲得目標網站的響應，但我不會把這種響應用IE反饋出來，有高手幫個忙么？
網上的代碼說是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;?這行我編譯不通過
????//?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 { }
)
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