c# winform清空ie缓存的几种方法

很明显 IE的缓存在其目录中显示的并不是真正的文件所处的位置,文件的位置是在隐藏的文件夹中,而且这个隐藏的文件夹我们一般找不到.在网上几种清空缓存的方法,在此我一一把代码和处理的效果显示出来.供大家参考.

①.使用ie缓存路径来删除缓存的

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string  cachePath = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache); //获取缓存路径 DirectoryInfo di =  new  DirectoryInfo(cachePath); foreach  (FileInfo fi  in  di.GetFiles( "*.*" , SearchOption.AllDirectories)) //遍历所有的文件夹 删除里面的文件 {    try    {     fi.Delete();    }    catch  { } }

效果:并没有真正的删除缓存文件.而且会出现很多异常,比如enguser.dat,index.dat,,,这些文件删除的时候会出现另一个程序还在使用的错误

②.调用winnet.dll 清理缓存 上代码

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using  System; using  System.Collections.Generic; using  System.Linq; using  System.Text; using  System.Rntime.InteropServices; using  System.IO; namespace  WpfClient.AppCode {   public  class  ClearCache   {    [StructLayout(LayoutKind.Explicit, Size = 80,CharSet=CharSet.Auto)]    protected  struct  INTERNET_CACHE_ENTRY_INFOA    {     [FieldOffset(0)]     public  uint  dwStructSize;     [FieldOffset(4)]     public  IntPtr lpszSourceUrlName;     [FieldOffset(8)]     public  IntPtr lpszLocalFileName;     [FieldOffset(12)]     public  uint  CacheEntryType;     [FieldOffset(16)]     public  uint  dwUseCount;     [FieldOffset(20)]     public  uint  dwHitRate;     [FieldOffset(24)]     public  uint  dwSizeLow;     [FieldOffset(28)]     public  uint  dwSizeHigh;     [FieldOffset(32)]     public  FILETIME LastModifiedTime;     [FieldOffset(40)]     public  FILETIME ExpireTime;     [FieldOffset(48)]     public  FILETIME LastAccessTime;     [FieldOffset(56)]     public  FILETIME LastSyncTime;     [FieldOffset(64)]     public  IntPtr lpHeaderInfo;     [FieldOffset(68)]     public  uint  dwHeaderInfoSize;     [FieldOffset(72)]     public  IntPtr lpszFileExtension;     [FieldOffset(76)]     public  uint  dwReserved;     [FieldOffset(76)]     public  uint  dwExemptDelta;    }    // For PInvoke: Initiates the enumeration of the cache groups in the Internet cache    [DllImport( @"wininet" ,     SetLastError =  true ,     CharSet = CharSet.Auto,     EntryPoint =  "FindFirstUrlCacheGroup" ,     CallingConvention = CallingConvention.StdCall)]    protected  static  extern  IntPtr FindFirstUrlCacheGroup(     int  dwFlags,     int  dwFilter,     IntPtr lpSearchCondition,     int  dwSearchCondition,     ref  long  lpGroupId,     IntPtr lpReserved);    // For PInvoke: Retrieves the next cache group in a cache group enumeration    [DllImport( @"wininet" ,     SetLastError =  true ,     CharSet = CharSet.Auto,     EntryPoint =  "FindNextUrlCacheGroup" ,     CallingConvention = CallingConvention.StdCall)]    protected  static  extern  bool  FindNextUrlCacheGroup(     IntPtr hFind,     ref  long  lpGroupId,     IntPtr lpReserved);    // For PInvoke: Releases the specified GROUPID and any associated state in the cache index file    [DllImport( @"wininet" ,     SetLastError =  true ,     CharSet = CharSet.Auto,     EntryPoint =  "DeleteUrlCacheGroup" ,     CallingConvention = CallingConvention.StdCall)]    protected  static  extern  bool  DeleteUrlCacheGroup(     long  GroupId,     int  dwFlags,     IntPtr lpReserved);    // For PInvoke: Begins the enumeration of the Internet cache    [DllImport( @"wininet" ,     SetLastError =  true ,     CharSet = CharSet.Auto,     EntryPoint =  "FindFirstUrlCacheEntryA" ,     CallingConvention = CallingConvention.StdCall)]    protected  static  extern  IntPtr FindFirstUrlCacheEntry(     [MarshalAs(UnmanagedType.LPTStr)]  string  lpszUrlSearchPattern,     IntPtr lpFirstCacheEntryInfo,     ref  int  lpdwFirstCacheEntryInfoBufferSize);    // For PInvoke: Retrieves the next entry in the Internet cache    [DllImport( @"wininet" ,     SetLastError =  true ,     CharSet = CharSet.Auto,     EntryPoint =  "FindNextUrlCacheEntryA" ,     CallingConvention = CallingConvention.StdCall)]    protected  static  extern  bool  FindNextUrlCacheEntry(     IntPtr hFind,     IntPtr lpNextCacheEntryInfo,     ref  int  lpdwNextCacheEntryInfoBufferSize);    // For PInvoke: Removes the file that is associated with the source name from the cache, if the file exists    [DllImport( @"wininet" ,     SetLastError =  true ,     CharSet = CharSet.Auto,     EntryPoint =  "DeleteUrlCacheEntryA" ,     CallingConvention = CallingConvention.StdCall)]    protected  static  extern  bool  DeleteUrlCacheEntry(     IntPtr lpszUrlName)    public  static  void  DelCache(){     // Indicates that all of the cache groups in the user's system should be enumerated     const  int  CACHEGROUP_SEARCH_ALL = 0x0;     // Indicates that all the cache entries that are associated with the cache group     // should be deleted, unless the entry belongs to another cache group.     const  int  CACHEGROUP_FLAG_FLUSHURL_ONDELETE = 0x2;     // File not found.     const  int  ERROR_FILE_NOT_FOUND = 0x2;     // No more items have been found.     const  int  ERROR_NO_MORE_ITEMS = 259;     // Pointer to a GROUPID variable     long  groupId = 0;     // Local variables     int  cacheEntryInfoBufferSizeInitial = 0;     int  cacheEntryInfoBufferSize = 0;     IntPtr cacheEntryInfoBuffer = IntPtr.Zero;     INTERNET_CACHE_ENTRY_INFOA internetCacheEntry;     IntPtr enumHandle = IntPtr.Zero;     bool  returnValue =  false     // Delete the groups first.     // Groups may not always exist on the system.     // For more information, visit the following Microsoft Web site:     // http://msdn.microsoft.com/library/?url=/workshop/networking/wininet/overview/cache.asp      // By default, a URL does not belong to any group. Therefore, that cache may become     // empty even when the CacheGroup APIs are not used because the existing URL does not belong to any group.       enumHandle = FindFirstUrlCacheGroup(0, CACHEGROUP_SEARCH_ALL, IntPtr.Zero, 0,  ref  groupId, IntPtr.Zero);     // If there are no items in the Cache, you are finished.     if  (enumHandle != IntPtr.Zero && ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error())      return ;     // Loop through Cache Group, and then delete entries.     while ( true )     {      // Delete a particular Cache Group.      returnValue = DeleteUrlCacheGroup(groupId, CACHEGROUP_FLAG_FLUSHURL_ONDELETE, IntPtr.Zero);      if  (!returnValue && ERROR_FILE_NOT_FOUND == Marshal.GetLastWin32Error())      {       returnValue = FindNextUrlCacheGroup(enumHandle,  ref  groupId, IntPtr.Zero);      }      if  (!returnValue && (ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error() || ERROR_FILE_NOT_FOUND == Marshal.GetLastWin32Error()))       break ;     }     // Start to delete URLs that do not belong to any group.     enumHandle = FindFirstUrlCacheEntry( null , IntPtr.Zero,  ref  cacheEntryInfoBufferSizeInitial);     if  (enumHandle == IntPtr.Zero && ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error())      return ;     cacheEntryInfoBufferSize = cacheEntryInfoBufferSizeInitial;     cacheEntryInfoBuffer = Marshal.AllocHGlobal(cacheEntryInfoBufferSize);     enumHandle = FindFirstUrlCacheEntry( null , cacheEntryInfoBuffer,  ref  cacheEntryInfoBufferSizeInitial);     while ( true )     {      internetCacheEntry = (INTERNET_CACHE_ENTRY_INFOA)Marshal.PtrToStructure(cacheEntryInfoBuffer, typeof (INTERNET_CACHE_ENTRY_INFOA));       cacheEntryInfoBufferSizeInitial = cacheEntryInfoBufferSize;      returnValue = DeleteUrlCacheEntry(internetCacheEntry.lpszSourceUrlName);      string  s = Marshal.PtrToStringAnsi(internetCacheEntry.lpszLocalFileName);      if  (!returnValue)      {       returnValue = FindNextUrlCacheEntry(enumHandle, cacheEntryInfoBuffer,  ref  cacheEntryInfoBufferSizeInitial);      }      if  (!returnValue && ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error())      {       break ;      }      if  (!returnValue && cacheEntryInfoBufferSizeInitial > cacheEntryInfoBufferSize)      {       cacheEntryInfoBufferSize = cacheEntryInfoBufferSizeInitial;       cacheEntryInfoBuffer = Marshal.ReAllocHGlobal(cacheEntryInfoBuffer, (IntPtr)cacheEntryInfoBufferSize);       returnValue = FindNextUrlCacheEntry(enumHandle, cacheEntryInfoBuffer,  ref  cacheEntryInfoBufferSizeInitial);      }     }     Marshal.FreeHGlobal(cacheEntryInfoBuffer);     }   } }

效果:总体来说还是有点效果的,但是效率极低,会出现长时间的等待情况,程序假死. 最重要的是不知道什么时候结束.

③.调用RunDll32.exe

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RunCmd( "RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 8" ); void  RunCmd( string  cmd) {   System.Diagnostics.Process p =  new  System.Diagnostics.Process();   p.StartInfo.FileName =  "cmd.exe" ;   // 关闭Shell的使用   p.StartInfo.UseShellExecute =  false ;   // 重定向标准输入   p.StartInfo.RedirectStandardInput =  true ;   // 重定向标准输出   p.StartInfo.RedirectStandardOutput =  true ;   //重定向错误输出   p.StartInfo.RedirectStandardError =  true ;   p.StartInfo.CreateNoWindow =  true ;   p.Start();   p.StandardInput.WriteLine(cmd);   p.StandardInput.WriteLine( "exit" ); }

效果: 这个方法解决的我的问题,缓存被清空.

以下是其他一些参数的说明:

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//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 //Delete All - "Also delete files and settings stored by add-ons" //RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 4351

转载于:https://www.cnblogs.com/dachuang/p/10406620.html