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Removing IE Cache and Cookies Using C # Code in WPF

I am using a WebBrowser control in my WPF application and I am looking to clear the cache of an IE file from code.

I tried using the following code

string[] Cookies = System.IO.Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.Cookies)); foreach (string currentFile in Cookies) { try { System.IO.File.Delete(currentFile); } catch (Exception ex) { MessageBox.Show(ex.Message); } }

This will delete the files from the specified folder, but when I go back using the WebBrowser control, the cookies will appear again as if they had never been deleted.

This may be the correct result, as I assume that the Environment.SpecialFolder.Cookies folder is in AppData, which is the current snapshot of what the user is doing.

If I open IE and do a hard cookie and cache deletion, I get the expected result in my application.

Is there any way to do this action in code?

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2 answers

A Microsoft KB article will help you improve and clear your entire cache.

Link to link

However, you can also try the following solution.

 string[] InterNetCache = System.IO.Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.InternetCache));
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Using the function below, you can delete a cookie for a specific host name. If the entire cache needs to be cleared, then the condition " if (sourceUrlName.Contains (hostEntry) & sourceUrlName.ToLower (). Contains (" cookie ")) should be deleted.

  /// <summary> /// Internets the set cookie. /// </summary> /// <param name="lpszUrlName">Name of the LPSZ URL.</param> /// <param name="lpszCookieName">Name of the LPSZ cookie.</param> /// <param name="lpszCookieData">The LPSZ cookie data.</param> /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns> [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)] static extern bool InternetSetCookie(string lpszUrlName, string lpszCookieName, string lpszCookieData); /// <summary> /// Internets the get cookie. /// </summary> /// <param name="lpszUrl">The LPSZ URL.</param> /// <param name="lpszCookieName">Name of the LPSZ cookie.</param> /// <param name="lpszCookieData">The LPSZ cookie data.</param> /// <param name="lpdwSize">Size of the LPDW.</param> /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns> [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)] static extern bool InternetGetCookie(string lpszUrl, string lpszCookieName, StringBuilder lpszCookieData, ref int lpdwSize); /// <summary> /// Finds the first URL cache entry. /// </summary> /// <param name="lpszUrlSearchPattern">The LPSZ URL search pattern.</param> /// <param name="lpFirstCacheEntryInfo">The lp first cache entry info.</param> /// <param name="lpdwFirstCacheEntryInfoBufferSize">Size of the LPDW first cache entry info buffer.</param> /// <returns>IntPtr.</returns> [DllImport(@"wininet", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "FindFirstUrlCacheEntryA", CallingConvention = CallingConvention.StdCall)] public static extern IntPtr FindFirstUrlCacheEntry( [MarshalAs(UnmanagedType.LPTStr)] string lpszUrlSearchPattern, IntPtr lpFirstCacheEntryInfo, ref int lpdwFirstCacheEntryInfoBufferSize); /// <summary> /// Finds the next URL cache entry. /// </summary> /// <param name="hFind">The h find.</param> /// <param name="lpNextCacheEntryInfo">The lp next cache entry info.</param> /// <param name="lpdwNextCacheEntryInfoBufferSize">Size of the LPDW next cache entry info buffer.</param> /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns> [DllImport(@"wininet", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "FindNextUrlCacheEntryA", CallingConvention = CallingConvention.StdCall)] public static extern bool FindNextUrlCacheEntry( IntPtr hFind, IntPtr lpNextCacheEntryInfo, ref int lpdwNextCacheEntryInfoBufferSize); /// <summary> /// Deletes the URL cache entry. /// </summary> /// <param name="lpszUrlName">Name of the LPSZ URL.</param> /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns> [DllImport(@"wininet", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "DeleteUrlCacheEntryA", CallingConvention = CallingConvention.StdCall)] public static extern bool DeleteUrlCacheEntry( IntPtr lpszUrlName); /// <summary> /// Clears the IE cache. /// </summary> /// <param name="url">The URL.</param> public static void ClearIECache(string url) { try { // No more items have been found. const int ERROR_NO_MORE_ITEMS = 259; string hostEntry = new Uri(url).Host; // Local variables int cacheEntryInfoBufferSizeInitial = 0; int cacheEntryInfoBufferSize = 0; IntPtr cacheEntryInfoBuffer = IntPtr.Zero; INTERNET_CACHE_ENTRY_INFOA internetCacheEntry; IntPtr enumHandle = IntPtr.Zero; bool returnValue = false; // 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)); string sourceUrlName = Marshal.PtrToStringAnsi(internetCacheEntry.lpszSourceUrlName); cacheEntryInfoBufferSizeInitial = cacheEntryInfoBufferSize; if (sourceUrlName.Contains(hostEntry) && sourceUrlName.ToLower().Contains("cookie")) { DeleteUrlCacheEntry(internetCacheEntry.lpszSourceUrlName); } 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); } catch { //error } } /// <summary> /// Struct INTERNET_CACHE_ENTRY_INFOA /// </summary> [StructLayout(LayoutKind.Explicit, Size = 80)] public 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 System.Runtime.InteropServices.ComTypes.FILETIME LastModifiedTime; [FieldOffset(40)] public System.Runtime.InteropServices.ComTypes.FILETIME ExpireTime; [FieldOffset(48)] public System.Runtime.InteropServices.ComTypes.FILETIME LastAccessTime; [FieldOffset(56)] public System.Runtime.InteropServices.ComTypes.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; }
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