//方法一：调用 wininet.dll清除cookie (推荐)SuppressWininetBehavior();//方法二：删除用户登录后的信息,这里相当于浏览器的注销功能,使用的是ie自带的功能 (推荐)HtmlDocument document = wb.Document;document.ExecCommand("ClearAuthenticationCache", false, null);//方法三：删除本机cookie 此方法会弹出ie清除cookie的弹出框//Temporary Internet Files  (Internet临时文件)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 8//Cookies//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 2//History (历史记录)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 1//Form. Data (表单数据)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 16//Passwords (密码)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 32//Delete All  (全部删除)//ShellExecute(IntPtr.Zero, "open", "rundll32.exe", " InetCpl.cpl,ClearMyTracksByProcess 2", "", ShowCommands.SW_HIDE);ShellExecute(IntPtr.Zero, "open", "rundll32.exe", " InetCpl.cpl,ClearMyTracksByProcess 255", "", ShowCommands.SW_HIDE);//方法四:使用webbrowser自带的清coookie的方法 (不推荐，清不掉session，实测无效)wb.Document.Cookie.Remove(0, (wb.Document.Cookie.Count() - 1));//方法五：使用js清除cookie (不推荐，清不掉session)wb.Navigate("javascript:void((function(){var a,b,c,e,f;f=0;a=document.cookie.split('; ');for(e=0;e<a.length&&a[e];e++){f++;for(b='.'+location.host;b;b=b.replace(/^(?:%5C.|[^%5C.]+)/,'')){for(c=location.pathname;c;c=c.replace(/.$/,'')){document.cookie=(a[e]+'; domain='+b+'; path='+c+'; expires='+new Date((new Date()).getTime()-1e11).toGMTString());}}}})())");//var a,b,c,e,f;//f=0;//a=document.cookie.split('; ');//b='.'+'baidu.com';b='.'+'www.baidu.com';//for(e=0;e<a.length;e++){//    //b='.'+location.host;//    b=b.replace(/^(?:%5C.|[^%5C.]+)/,'');//    c=location.pathname;//    c=c.replace(/.$/,'');//    ck = a[e]+'; domain='+b+'; path='+c+'; expires='+new Date((new Date()).getTime()-1e11).toGMTString();//    console.log(ck);//    document.cookie=ck;//}//方法六：使用InternetSetCookie给cookie赋null值 (不推荐)//也可以给此Cookie赋空值:InternetSetCookie//InternetSetCookie("http://.qq.com/", NULL, "uin=; PATH=/; DOMAIN=qq.com");

    [System.Runtime.InteropServices.DllImport("wininet.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]public static extern bool InternetSetOption(int hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);/// <summary>/// 使用InternetSetOption操作wininet.dll清除webbrowser里的cookie/// </summary>private static unsafe void SuppressWininetBehavior(){/* SOURCE: http://msdn.microsoft.com/en-us/library/windows/desktop/aa385328%28v=vs.85%29.aspx* INTERNET_OPTION_SUPPRESS_BEHAVIOR (81):*      A general purpose option that is used to suppress behaviors on a process-wide basis. *      The lpBuffer parameter of the function must be a pointer to a DWORD containing the specific behavior to suppress. *      This option cannot be queried with InternetQueryOption. *      * INTERNET_SUPPRESS_COOKIE_PERSIST (3):*      Suppresses the persistence of cookies, even if the server has specified them as persistent.*      Version:  Requires Internet Explorer 8.0 or later.*/int option = (int)3/* INTERNET_SUPPRESS_COOKIE_PERSIST*/;int* optionPtr = &option;bool success = InternetSetOption(0, 81/*INTERNET_OPTION_SUPPRESS_BEHAVIOR*/, new IntPtr(optionPtr), sizeof(int));if (!success){MessageBox.Show("Something went wrong ! Clear Cookie Failed!");}}

 //方法二：删除用户登录后的信息,这里相当于浏览器的注销功能,使用的是ie自带的功能 (推荐)HtmlDocument document = wb.Document;document.ExecCommand("ClearAuthenticationCache", false, null);

 //方法三：删除本机cookie 此方法会弹出ie清除cookie的弹出框//Temporary Internet Files  (Internet临时文件)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 8//Cookies//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 2//History (历史记录)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 1//Form. Data (表单数据)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 16//Passwords (密码)//RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 32//Delete All  (全部删除)//ShellExecute(IntPtr.Zero, "open", "rundll32.exe", " InetCpl.cpl,ClearMyTracksByProcess 2", "", ShowCommands.SW_HIDE);ShellExecute(IntPtr.Zero, "open", "rundll32.exe", " InetCpl.cpl,ClearMyTracksByProcess 255", "", ShowCommands.SW_HIDE);

    public enum ShowCommands : int{SW_HIDE = 0,SW_SHOWNORMAL = 1,SW_NORMAL = 1,SW_SHOWMINIMIZED = 2,SW_SHOWMAXIMIZED = 3,SW_MAXIMIZE = 3,SW_SHOWNOACTIVATE = 4,SW_SHOW = 5,SW_MINIMIZE = 6,SW_SHOWMINNOACTIVE = 7,SW_SHOWNA = 8,SW_RESTORE = 9,SW_SHOWDEFAULT = 10,SW_FORCEMINIMIZE = 11,SW_MAX = 11}[DllImport("shell32.dll")]static extern IntPtr ShellExecute(IntPtr hwnd, string lpOperation, string lpFile, string lpParameters, string lpDirectory, ShowCommands nShowCmd);

  //方法四:使用webbrowser自带的清coookie的方法 (不推荐，清不掉session，实测无效)wb.Document.Cookie.Remove(0, (wb.Document.Cookie.Count() - 1));

 //方法五：使用js清除cookie (不推荐，清不掉session)wb.Navigate("javascript:void((function(){var a,b,c,e,f;f=0;a=document.cookie.split('; ');for(e=0;e<a.length&&a[e];e++){f++;for(b='.'+location.host;b;b=b.replace(/^(?:%5C.|[^%5C.]+)/,'')){for(c=location.pathname;c;c=c.replace(/.$/,'')){document.cookie=(a[e]+'; domain='+b+'; path='+c+'; expires='+new Date((new Date()).getTime()-1e11).toGMTString());}}}})())");//var a,b,c,e,f;//f=0;//a=document.cookie.split('; ');//b='.'+'baidu.com';b='.'+'www.baidu.com';//for(e=0;e<a.length;e++){//    //b='.'+location.host;//    b=b.replace(/^(?:%5C.|[^%5C.]+)/,'');//    c=location.pathname;//    c=c.replace(/.$/,'');//    ck = a[e]+'; domain='+b+'; path='+c+'; expires='+new Date((new Date()).getTime()-1e11).toGMTString();//    console.log(ck);//    document.cookie=ck;//}

 //方法六：使用InternetSetCookie给cookie赋null值 (不推荐)//也可以给此Cookie赋空值:InternetSetCookie//InternetSetCookie("http://.qq.com/", NULL, "uin=; PATH=/; DOMAIN=qq.com");