1 public class IPProxy
2 {
3 [System.Runtime.InteropServices.DllImport("wininet.dll", SetLastError = true)]
4 private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lPBuffer, int lpdwBufferLength);
5 private const int INTERNET_OPTION_REFRESH = 0x000025;
6 private const int INTERNET_OPTION_SETTINGS_CHANGED = 0x000027;
7
8 public static bool Proxy(string ip,int port) {
9 Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Internet Settings", true);
10 //设置代理可用
11 rk.SetValue("ProxyEnable", 1);
12 //设置代理IP和端口
13 rk.SetValue("ProxyServer", string.Format("{0}:{1}", ip, port));
14 rk.Close();
15 //使它立即生效
16 InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
17 InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);
18 if (IsUseful("http://www.baidu.com/")) {
19 return true;
20 }
21 CancelProxy();
22 return false;
23 }
24 public static void CancelProxy() {
25 Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Internet Settings", true);
26 rk.SetValue("ProxyEnable", 0);
27 }
28 public static bool IsUseful(string ipOrHost) {
29 using (System.Net.NetworkInformation.Ping pingSender = new System.Net.NetworkInformation.Ping())
30 {
31
32 try
33 {
34
35 return System.Net.NetworkInformation.IPStatus.Success.Equals(pingSender.Send(ipOrHost,6000).Status);
36 }
37 catch {
38 return false;
39 }
40 }
41
42 }
43 }
