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 试了很多方法,最后发现万剑大哥的方法管用,转载一下  
转自:https://www.cnblogs.com/midcn/p/3527123.html  
通过测试webBrowser与IE缓存和Cookie都存放在Local Settings\Temporary 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  
   
解决方案2:快速清除webBrowser Cookie  
   
 
 wb.Document.Cookie.Remove(0, (wb.Document.Cookie.Count - 1))
 
   
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