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下面是我测试下来的6种清除webbrowser中cookie的6种方法：

往下拉有详细用法

//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

方法一：

[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);/// 
/// 使用InternetSetOption操作wininet.dll清除webbrowser里的cookie///
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：

就只有这一句就好了：

//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：

//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);

ShellExecute方法：

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：

//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：

//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

将 wb.Navigate("javascript:void((function(){。。。}里的内容换成下面注释掉的代码，写好你要清cookier 的domain然后就可以清了，但清不掉session，这个是从外国网站上看来的，实际无效！

方法六：

//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");

关于InternetSetCookie这个方法自己网上搜索一下.

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