本文实例讲述了C#清除WebBrowser中Cookie缓存的方法。分享给大家供大家参考，

具体如下：

最近用C#写一个程序，用一个窗体中的WebBrowser来登陆网站，但是WebBrowser有cookie缓存，第二次登陆的时候WebBrowser仍然是第一次登陆后的状态，所以要清除WebBrowser的cookie缓存。

在stackoverflow上找到一段可用的代码：

[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: //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 !>");

  }

}

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