WebBrowser控件是基于IE浏览器的，所以它的内核功能是依赖于IE. code:

class IEProxy    {        //设置代理选项                        private const int INTERNET_OPTION_PROXY = 38;        //设置代理类型                        private const int INTERNET_OPEN_TYPE_PROXY = 3;                        //设置代理类型，直接访问，不需要通过代理服务器        private const int INTERNET_OPEN_TYPE_DIRECT = 1;        private string ProxyStr;        //You can change the proxy with InternetSetOption method from the wininet.dll                        //这个就是设置一个Internet 选项。设置代理是Internet 选项其中的一个功能        [System.Runtime.InteropServices.DllImport("wininet.dll", SetLastError = true)]        private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);        //定义代理信息的结构体                          public struct Struct_INTERNET_PROXY_INFO        {            public int dwAccessType;            public IntPtr proxy;            public IntPtr proxyBypass;        }       //设置代理的方法       //strProxy为代理IP:端口                private bool InternetSetOption(string strProxy)        {            int bufferLength;            IntPtr intptrStruct;            Struct_INTERNET_PROXY_INFO struct_IPI;                        //Filling in structure             if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)            {                strProxy = string.Empty;                struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;            }            else            {                struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;            }            //把代理地址设置到非托管内存地址中            struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);            //代理通过本地连接到代理服务器上            struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");            bufferLength = Marshal.SizeOf(struct_IPI);            //Allocating memory            //关联到内存            intptrStruct = Marshal.AllocCoTaskMem(bufferLength);           //Converting structure to IntPtr            //把结构体转换到句柄            Marshal.StructureToPtr(struct_IPI, intptrStruct, true);            return InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, bufferLength);        }        public IEProxy(string strProxy)        {            this.ProxyStr = strProxy;        }        //设置代理        public bool SetIESettings()        {            return InternetSetOption(this.ProxyStr);        }        //取消代理        public bool DisableIEProxy()        {            return InternetSetOption(string.Empty);        }    }