下面是我测试下来的6种清除webbrowser中cookie的6种方法：
//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<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");
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);
/// <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：
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<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;
//}
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.