C＃WebBrowser控件：清除缓存而不清除cookie
我有这个代码清除C＃WebBrowser控件中的缓存。 它的问题是它也清除了cookie。 我似乎是整个互联网上唯一不想要的人。
我需要维护cookie，但要丢弃缓存。
特别感兴趣的是这一行：
const int CACHEGROUP_SEARCH_ALL = 0x0; 它似乎定义了哪些“缓存组”（无论那些是什么）都被清除了，我希望cookie是一个缓存组，我可以以某种方式跳过。 然而，试图找到关于此的任何信息只会产生令人头痛的问题。
此代码最初来自MSDN文章，但它甚至没有提到cookie或缓存组。
您可以在代码顶部看到MSDN文章。
/** * Modified from code originally found here: http://support.microsoft.com/kb/326201 **/ using System; using System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; using System.Diagnostics; namespace Goop { // Class for deleting the cache. public static class WebBrowserHelper { #region Definitions/DLL Imports // For PInvoke: Contains information about an entry in the Internet cache [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; } // 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)] public 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)] public 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)] public 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)] public 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)] public 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)] public static extern bool DeleteUrlCacheEntry( IntPtr lpszUrlName); #endregion #region Public Static Functions /// /// Clears the cache of the web browser /// public static void ClearCache() { // 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) { if (ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error() || ERROR_FILE_NOT_FOUND == Marshal.GetLastWin32Error()) { break; } // 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)); if (ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error() || cacheEntryInfoBufferSize == 0) { break; } cacheEntryInfoBufferSizeInitial = cacheEntryInfoBufferSize; returnValue = DeleteUrlCacheEntry(internetCacheEntry.lpszSourceUrlName); 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); } #endregion } }/** * Modified from code originally found here: http://support.microsoft.com/kb/326201 **/ using System; using System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; using System.Diagnostics; namespace Goop { // Class for deleting the cache. public static class WebBrowserHelper { #region Definitions/DLL Imports // For PInvoke: Contains information about an entry in the Internet cache [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; } // 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)] public 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)] public 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)] public 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)] public 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)] public 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)] public static extern bool DeleteUrlCacheEntry( IntPtr lpszUrlName); #endregion #region Public Static Functions /// /// Clears the cache of the web browser /// public static void ClearCache() { // 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) { if (ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error() || ERROR_FILE_NOT_FOUND == Marshal.GetLastWin32Error()) { break; } // 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)); if (ERROR_NO_MORE_ITEMS == Marshal.GetLastWin32Error() || cacheEntryInfoBufferSize == 0) { break; } cacheEntryInfoBufferSizeInitial = cacheEntryInfoBufferSize; returnValue = DeleteUrlCacheEntry(internetCacheEntry.lpszSourceUrlName); 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); } #endregion } }
任何和所有帮助非常感谢。
查看INTERNET_CACHE_ENTRY_INFOA的文档，尤其是描述CacheEntryType的部分：
一个位掩码，指示缓存条目的类型及其属性。 缓存条目类型包括：历史条目（URLHISTORY_CACHE_ENTRY），cookie条目（COOKIE_CACHE_ENTRY）和正常缓存内容（NORMAL_CACHE_ENTRY）。
此成员可以是以下属性标志中的零个或多个，以及下面列出的缓存类型标志。
在下面你会得到一个条目类型列表，一个是
COOKIE_CACHE_ENTRY
在你抛弃一切之前，这似乎是你想要检查的东西？
FiddlerCore公开了一个具有该签名的方法。 ClearCacheItems（bool clearCookies，bool clearFiles）。
–RANT–
每个链接到的kb文章都有很多错误（其他答案的源代码来自），我浪费了大约2天试图让它在所有必要的设置中工作。 它是通过互联网进行的复制粘贴，并且根据操作系统和IE版本报告了许多错误。
Fiddler最初由Microsoft员工编写，由FiddlerCore.dll提供支持。 Fiddler的Telerik（现任所有者/维护者/卖家）仍然免费更新，维护和赠送FiddlerCore。 如果你不想添加对FiddlerCore的引用，你可以反汇编dll，并且它显示了调用所有这些可怕的WinINet函数的CORRECT方法，但我认为在这里发布它会对Telerik / plagarism造成伤害。
目前，Fiddlercore在此托管： http ： //www.telerik.com/fiddler/fiddlercore
条件应该在下面，我用VB。
Dim icei As INTERNET_CACHE_ENTRY_INFO ...... If (icei.CacheEntryType And COOKIE_CACHE_ENTRY) <> COOKIE_CACHE_ENTRY And _ (icei.CacheEntryType And NORMAL_CACHE_ENTRY) = NORMAL_CACHE_ENTRY Then cachefile = GetStrFromPtrA(icei.lpszSourceUrlName) Call DeleteUrlCacheEntry(cachefile) End If
这将删除缓存的文件，但仍保留cookie。
在页面中添加以下元标记