Csharp/C#教程：C#实现清除IE浏览器缓存的方法分享

本文实例讲述了C#实现清除IE浏览器缓存的方法。分享给大家供大家参考。具体如下：

项目中碰到wpfwebbrowser的几个问题,在此记录一下

1.webbrowser中对于jquery的bind事件的处理.

在普通的浏览器下一下这种写法没有任何问题

　　varcontent=$("<div><h4><span>"+category_name+"</span>(<aid='href_"+guid+"'href='AddOrEditShowInfo.aspx?Category="+guid+"'>添加展示</a>)"+ "<spanid='edit_"+guid+"'style='font-size:12px;cursor:pointer;'onclick='showCategory(this,""+guid+"")'>修改分类</span>  "+ "<spanid='del_"+guid+"'style='font-size:12px;cursor:pointer;'onclick=delCategory(this,""+guid+"")'>删除分类</span></h4>"+ "<tableclass='gridview'cellspacing='0'rules='all'border='1'id='gvData'width='100%'>"+ "<thead><tr><th>缩略图</th><th>展示名称</th><th>简介</th><th>详细描述</th><th>操作</th></tr></thead>"+ "<tbodyid='t_"+guid+"'class='css_tbody'></tbody></table></div>" ); $("#vtab").append(content);

但是在webbrowser中事件就会不响应,把content中的onclick去掉,在下面这样绑定:

$("#edit_"+guid).unbind("click").bind("click",function(){showCategory(this,guid)}); $("#del_"+guid).unbind("click").bind("click",function(){delCategory(this,guid)});

2.在webbrowser中使用jqueryuploadify上传组件的问题

使用该组件的时候,发现上传图片的时候,第一次上传的时候没有任何问题,第二次上传的时候会出现无法上传的情况,没有任何反应,没有任何错误,上传进度不动,上传的后台代码也不能触发.

解决方案是:清空浏览器缓存就Ok了.下面就介绍代码清空缓存的方法

3.清理IE缓存的方法

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

stringcachePath=Environment.GetFolderPath(Environment.SpecialFolder.InternetCache); //获取缓存路径 DirectoryInfodi=newDirectoryInfo(cachePath); foreach(FileInfofiindi.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

usingSystem; usingSystem.Collections.Generic; usingSystem.Linq; usingSystem.Text; usingSystem.Rntime.InteropServices; usingSystem.IO; namespaceWpfClient.AppCode { publicclassClearCache { [StructLayout(LayoutKind.Explicit,Size=80,CharSet=CharSet.Auto)] protectedstructINTERNET_CACHE_ENTRY_INFOA { [FieldOffset(0)] publicuintdwStructSize; [FieldOffset(4)] publicIntPtrlpszSourceUrlName; [FieldOffset(8)] publicIntPtrlpszLocalFileName; [FieldOffset(12)] publicuintCacheEntryType; [FieldOffset(16)] publicuintdwUseCount; [FieldOffset(20)] publicuintdwHitRate; [FieldOffset(24)] publicuintdwSizeLow; [FieldOffset(28)] publicuintdwSizeHigh; [FieldOffset(32)] publicFILETIMELastModifiedTime; [FieldOffset(40)] publicFILETIMEExpireTime; [FieldOffset(48)] publicFILETIMELastAccessTime; [FieldOffset(56)] publicFILETIMELastSyncTime; [FieldOffset(64)] publicIntPtrlpHeaderInfo; [FieldOffset(68)] publicuintdwHeaderInfoSize; [FieldOffset(72)] publicIntPtrlpszFileExtension; [FieldOffset(76)] publicuintdwReserved; [FieldOffset(76)] publicuintdwExemptDelta; } //ForPInvoke:InitiatestheenumerationofthecachegroupsintheInternetcache [DllImport(@"wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="FindFirstUrlCacheGroup", CallingConvention=CallingConvention.StdCall)] protectedstaticexternIntPtrFindFirstUrlCacheGroup( intdwFlags, intdwFilter, IntPtrlpSearchCondition, intdwSearchCondition, reflonglpGroupId, IntPtrlpReserved); //ForPInvoke:Retrievesthenextcachegroupinacachegroupenumeration [DllImport(@"wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="FindNextUrlCacheGroup", CallingConvention=CallingConvention.StdCall)] protectedstaticexternboolFindNextUrlCacheGroup( IntPtrhFind, reflonglpGroupId, IntPtrlpReserved); //ForPInvoke:ReleasesthespecifiedGROUPIDandanyassociatedstateinthecacheindexfile [DllImport(@"wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="DeleteUrlCacheGroup", CallingConvention=CallingConvention.StdCall)] protectedstaticexternboolDeleteUrlCacheGroup( longGroupId, intdwFlags, IntPtrlpReserved); //ForPInvoke:BeginstheenumerationoftheInternetcache [DllImport(@"wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="FindFirstUrlCacheEntryA", CallingConvention=CallingConvention.StdCall)] protectedstaticexternIntPtrFindFirstUrlCacheEntry( [MarshalAs(UnmanagedType.LPTStr)]stringlpszUrlSearchPattern, IntPtrlpFirstCacheEntryInfo, refintlpdwFirstCacheEntryInfoBufferSize); //ForPInvoke:RetrievesthenextentryintheInternetcache [DllImport(@"wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="FindNextUrlCacheEntryA", CallingConvention=CallingConvention.StdCall)] protectedstaticexternboolFindNextUrlCacheEntry( IntPtrhFind, IntPtrlpNextCacheEntryInfo, refintlpdwNextCacheEntryInfoBufferSize); //ForPInvoke:Removesthefilethatisassociatedwiththesourcenamefromthecache,ifthefileexists [DllImport(@"wininet", SetLastError=true, CharSet=CharSet.Auto, EntryPoint="DeleteUrlCacheEntryA", CallingConvention=CallingConvention.StdCall)] protectedstaticexternboolDeleteUrlCacheEntry( IntPtrlpszUrlName) publicstaticvoidDelCache(){ //Indicatesthatallofthecachegroupsintheuser'ssystemshouldbeenumerated constintCACHEGROUP_SEARCH_ALL=0x0; //Indicatesthatallthecacheentriesthatareassociatedwiththecachegroup //shouldbedeleted,unlesstheentrybelongstoanothercachegroup. constintCACHEGROUP_FLAG_FLUSHURL_ONDELETE=0x2; //Filenotfound. constintERROR_FILE_NOT_FOUND=0x2; //Nomoreitemshavebeenfound. constintERROR_NO_MORE_ITEMS=259; //PointertoaGROUPIDvariable longgroupId=0; //Localvariables intcacheEntryInfoBufferSizeInitial=0; intcacheEntryInfoBufferSize=0; IntPtrcacheEntryInfoBuffer=IntPtr.Zero; INTERNET_CACHE_ENTRY_INFOAinternetCacheEntry; IntPtrenumHandle=IntPtr.Zero; boolreturnValue=false //Deletethegroupsfirst. //Groupsmaynotalwaysexistonthesystem. //Formoreinformation,visitthefollowingMicrosoftWebsite: //https://msdn.microsoft.com/library/?url=/workshop/networking/wininet/overview/cache.asp //Bydefault,aURLdoesnotbelongtoanygroup.Therefore,thatcachemaybecome //emptyevenwhentheCacheGroupAPIsarenotusedbecausetheexistingURLdoesnotbelongtoanygroup. enumHandle=FindFirstUrlCacheGroup(0,CACHEGROUP_SEARCH_ALL,IntPtr.Zero,0,refgroupId,IntPtr.Zero); //IftherearenoitemsintheCache,youarefinished. if(enumHandle!=IntPtr.Zero&&ERROR_NO_MORE_ITEMS==Marshal.GetLastWin32Error()) return; //LoopthroughCacheGroup,andthendeleteentries. while(true) { //DeleteaparticularCacheGroup. returnValue=DeleteUrlCacheGroup(groupId,CACHEGROUP_FLAG_FLUSHURL_ONDELETE,IntPtr.Zero); if(!returnValue&&ERROR_FILE_NOT_FOUND==Marshal.GetLastWin32Error()) { returnValue=FindNextUrlCacheGroup(enumHandle,refgroupId,IntPtr.Zero); } if(!returnValue&&(ERROR_NO_MORE_ITEMS==Marshal.GetLastWin32Error()||ERROR_FILE_NOT_FOUND==Marshal.GetLastWin32Error())) break; } //StarttodeleteURLsthatdonotbelongtoanygroup. enumHandle=FindFirstUrlCacheEntry(null,IntPtr.Zero,refcacheEntryInfoBufferSizeInitial); if(enumHandle==IntPtr.Zero&&ERROR_NO_MORE_ITEMS==Marshal.GetLastWin32Error()) return; cacheEntryInfoBufferSize=cacheEntryInfoBufferSizeInitial; cacheEntryInfoBuffer=Marshal.AllocHGlobal(cacheEntryInfoBufferSize); enumHandle=FindFirstUrlCacheEntry(null,cacheEntryInfoBuffer,refcacheEntryInfoBufferSizeInitial); while(true) { internetCacheEntry=(INTERNET_CACHE_ENTRY_INFOA)Marshal.PtrToStructure(cacheEntryInfoBuffer,typeof(INTERNET_CACHE_ENTRY_INFOA)); cacheEntryInfoBufferSizeInitial=cacheEntryInfoBufferSize; returnValue=DeleteUrlCacheEntry(internetCacheEntry.lpszSourceUrlName); strings=Marshal.PtrToStringAnsi(internetCacheEntry.lpszLocalFileName); if(!returnValue) { returnValue=FindNextUrlCacheEntry(enumHandle,cacheEntryInfoBuffer,refcacheEntryInfoBufferSizeInitial); } 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,refcacheEntryInfoBufferSizeInitial); } } 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

RunCmd("RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess8"); voidRunCmd(stringcmd) { System.Diagnostics.Processp=newSystem.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:

//TemporaryInternetFiles（Internet临时文件） //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess8 //Cookies //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess2 //History(历史记录) //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess1 //FormData（表单数据） //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess16 //Passwords(密码） //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess32 //DeleteAll（全部删除） //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess255 //DeleteAll-"Alsodeletefilesandsettingsstoredbyadd-ons" //RunDll32.exeInetCpl.cpl,ClearMyTracksByProcess4351

希望本文所述对大家的C#程序设计有所帮助。

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