十招教你提高ASP.NET页面载入速度 -技术开发专区

十招教你提高ASP.NET页面载入速度

作者：shss博客编辑：胡铭娅 2010-05-07 10:45 来源：shss博

　　然后我们利用正则完全删除ViewState

// 过滤ViewState
        private string ViewStateFilter( string strHTML ) {
            string matchString1 = "type=\"hidden\" name=\"__VIEWSTATE\" id=\"__VIEWSTATE\"";
            string matchString2 = "type=\"hidden\" name=\"__EVENTVALIDATION\" id=\"__EVENTVALIDATION\"";
            string matchString3 = "type=\"hidden\" name=\"__EVENTTARGET\" id=\"__EVENTTARGET\"";
            string matchString4 = "type=\"hidden\" name=\"__EVENTARGUMENT\" id=\"__EVENTARGUMENT\"";

            string positiveLookahead1 = "(?=.*(" + Regex.Escape( matchString1 ) + "))";
            string positiveLookahead2 = "(?=.*(" + Regex.Escape( matchString2 ) + "))";
            string positiveLookahead3 = "(?=.*(" + Regex.Escape( matchString3 ) + "))";
            string positiveLookahead4 = "(?=.*(" + Regex.Escape( matchString4 ) + "))";

            RegexOptions opt = RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.CultureInvariant | RegexOptions.Compiled;

            Regex[] arrRe = new Regex[] {
                new Regex("\\s*<div>" + positiveLookahead1 + "(.*?)</div>\\s*", opt),
                new Regex("\\s*<div>" + positiveLookahead2 + "(.*?)</div>\\s*", opt),
                new Regex("\\s*<div>" + positiveLookahead3 + "(.*?)</div>\\s*", opt),
                new Regex("\\s*<div>" + positiveLookahead3 + "(.*?)</div>\\s*", opt),
                new Regex("\\s*<div>" + positiveLookahead4 + "(.*?)</div>\\s*", opt)
            };

            foreach ( Regex re in arrRe ) {
                strHTML = re.Replace( strHTML, "" );
            }

            return strHTML;
        }
以下是删除页面空白的方法：
        // 删除空白
         private Regex tabsRe = new Regex( "\\t", RegexOptions.Compiled | RegexOptions.Multiline );
        private Regex carriageReturnRe = new Regex( ">\\r\\n<", RegexOptions.Compiled | RegexOptions.Multiline );
        private Regex carriageReturnSafeRe = new Regex( "\\r\\n", RegexOptions.Compiled | RegexOptions.Multiline );
        private Regex multipleSpaces = new Regex( "  ", RegexOptions.Compiled | RegexOptions.Multiline );
        private Regex spaceBetweenTags = new Regex( ">\\s<", RegexOptions.Compiled | RegexOptions.Multiline );
        private string WhitespaceFilter( string html ) {
            html = tabsRe.Replace( html, string.Empty );
            html = carriageReturnRe.Replace( html, "><" );
            html = carriageReturnSafeRe.Replace( html, " " );

            while ( multipleSpaces.IsMatch( html ) )
                html = multipleSpaces.Replace( html, " " );

            html = spaceBetweenTags.Replace( html, "><" );

            html = html.Replace( "//<![CDATA[", "" );
            html = html.Replace( "//]]>", "" );

            return html;
        }
以下是删除ASP.NET控件的垃圾UniqueID名称方法：
        // 过滤NamingContainer
        private string NamingContainerFilter( string html ) {
            RegexOptions opt =
                RegexOptions.IgnoreCase |
                RegexOptions.Singleline |
                RegexOptions.CultureInvariant |
                RegexOptions.Compiled;

            Regex re = new Regex( "( name=\")(?=.*(" + Regex.Escape( "$" ) + "))([^\"]+?)(\")", opt );

            html = re.Replace( html, new MatchEvaluator( delegate( Match m ) {
                int lastDollarSignIndex = m.Value.LastIndexOf( '$' );

                if ( lastDollarSignIndex >= 0 ) {
                    return m.Groups[ 1 ].Value + m.Value.Substring( lastDollarSignIndex + 1 );
                }
                else {
                    return m.Value;
                }
            } ) );

            return html;
        }
最后，我们把以上过滤方法整合到CommonFilter类的Write方法：
        public override void Write( byte[] buffer, int offset, int count ) {
            // 转换buffer为字符串
            byte[] data = new byte[ count ];
            Buffer.BlockCopy( buffer, offset, data, 0, count );
            string html = System.Text.Encoding.UTF8.GetString( buffer );

            //
            // 以下整合过滤方法
             //

            html = NamingContainerFilter( html );
            html = ViewStateFilter( html );
            html = WhitespaceFilter( html );

            byte[] outdata = System.Text.Encoding.UTF8.GetBytes( html );

            // 写入磁盘
            _cacheStream.Write( outdata, 0, outdata.GetLength( 0 ) );
            _responseStream.Write( outdata, 0, outdata.GetLength( 0 ) );
        }

第1页：生成动态页面的静态内容第2页：页面GZIP压缩第3页：输出页面缓存第4页：完全删除ViewState 第5页：缓存破坏

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