本文實例講述了C#清除WebBrowser中Cookie緩存的方法。分享給大家供大家參考，具體如下：
最近用C#寫一個程序，用一個窗體中的WebBrowser來登陸網站，但是WebBrowser有cookie緩存，第二次登陸的時候WebBrowser仍然是第一次登陸后的狀態，所以要清除WebBrowser的cookie緩存。
在stackoverflow上找到一段可用的代碼：
[DllImport("wininet.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]public static extern bool InternetSetOption(int hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);private 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 !>?"); }} 
