清除webBrowser 缓存和Cookie的解决方案

通过测试webBrowser与IE缓存和Cookie都存放在Local SettingsTemporary Internet Files，我们可以直接调用IE API进行清除

解决方案1：

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);

//清除IE临时文件
ShellExecute(IntPtr.Zero, "open", "rundll32.exe", "InetCpl.cpl,ClearMyTracksByProcess 255", "", ShowCommands.SW_HIDE)

其中ClearMyTracksByProcess 可进行选择设置：

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）

RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 255

缺点：在Webbrowser 在不关闭的情况下无法清除cookie

解决方案2：

//清除Session所需要调用的函数
[ DllImport ("wininet.dll" , SetLastError = true )]
private static extern bool InternetSetOption ( IntPtr hInternet , int dwOption, IntPtr lpBuffer , int lpdwBufferLength );
//清空session
public void ResetSession()
{
    //Session的选项ID为42
    InternetSetOption ( IntPtr.Zero , 42 , IntPtr.Zero , 0 );
}
//清空cookie
public void ResetCookie()
{
    if (c_web.Document != null )
    {
    c_web.Document.Cookie.Remove (0 , c_web.Document.Cookie.Count() - 1 );

    }
    string [] theCookies = System.IO.Directory.GetFiles ( Environment.GetFolderPath (Environment.SpecialFolder.Cookies ));
    foreach (string currentFile in theCookies )
    {
        try
        {
            System.IO.File.Delete (currentFile );
        }
        catch (Exception ex)
        {
        }
    }
}

缺点：需要程序取得管理员权限

解决方案3：

利用 webBrowser 执行清楚cookie的js代码

this._webBrowser.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());}}}})())");

缺点：在某些运行环境中会报“无法下载”的错，至于原因目前还没找到