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