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ASP.NET页面性能提升8倍的优化方法

作者：Fish Li 编辑： 皮丽华 2012-03-12 10:04 来源：博客园
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　　测试代码：

[Action]
public object Test2(string callTimes)
{
    int count = 0;
    int.TryParse(callTimes, out count);
    if( count <= 0 )
        return count;

    HttpContext context = HttpContext.Current;

    // 先执行一次，排除编译时间
    string html = MyMVC.PageExecutor.Render(context, "/TestPage/InlinePage.aspx", null);

    Stopwatch watch = Stopwatch.StartNew();
    for( int i = 0; i < count; i++ )
        html = MyMVC.PageExecutor.Render(context, "/TestPage/InlinePage.aspx", null);
    watch.Stop();

    return watch.Elapsed.ToString();
}

　　当我测试执行10000次时，耗时：00:00:01.2345842

　　分析优化结果1

　　测试用例1执行相同次数所花费的时间是测试用例2的6倍，为什么会这样呢?

　　为了回答这个问题，我们首先要知道前面二个页面在执行时，它们是如何运行的。

　　说到这里，就不得不谈ASP.NET的页面编译方式了。ASP.NET的页面编译过程是个复杂的操作，其实我们可以不用关心页面是如何编译的，

　　但要知道：页面编译后是什么样的。

　　为了能直观地了解页面编译后的样子，我编译了整个网站，并生成到一个DLL文件中， 然后使用Reflector.exe来分析这个DLL的源代码。

　　将网站编译成一个DLL文件有二个方法：

　　1. 安装WebDeployment插件。

　　2. 使用我的工具：FishAspnetTool

　　本文将使用FishAspnetTool来编译测试网站获得编译后的DLL文件。

　　FishAspnetTool是什么?

　　FishAspnetTool是我在使用Visual Web Developer 2005时，为了方便编译网站而写的一个小工具。

　　下载地址：http://www.cnblogs.com/fish-li/archive/2011/10/30/2229497.html

　　注意：下载的是一个工具包，安装后，从开始菜单中运行FishTools\FishAspnetTool即可。

　　下面是工具的运行截图。

 


▲

　　操作方法：

　　1. 点击粉色按钮，选择网站路径。

　　2. 单选按钮选择第2项。

　　3. 点击【发布网站】按钮。

　　在编译网站之后，我就可以知道网站在运行时如何运行页面了。

　　测试用例1的页面，最后被编译成这样了：

 

namespace ASP
{
    using System;
    using System.Diagnostics;
    using System.Runtime.CompilerServices;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;

    [CompilerGlobalScope]
    public class testpage_webfrompage_aspx : TestPage_WebFromPage, IHttpHandler
    {
        private static object __fileDependencies;
        private static bool __initialized;

        [DebuggerNonUserCode]
        public testpage_webfrompage_aspx()
        {
            base.AppRelativeVirtualPath = "~/TestPage/WebFromPage.aspx";
            if (!__initialized)
            {
                string[] virtualFileDependencies = new string[] { "~/TestPage/WebFromPage.aspx", "~/TestPage/WebFromPage.aspx.cs" };
                __fileDependencies = base.GetWrappedFileDependencies(virtualFileDependencies);
                __initialized = true;
            }
            base.Server.ScriptTimeout = 0x1c9c380;
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control10(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("<hr />"));
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control11(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("\r\n\t"));
            HyperLink link = this.__BuildControl__control12();
            accessor.AddParsedSubObject(link);
            accessor.AddParsedSubObject(new LiteralControl("<br />\r\n"));
        }

        [DebuggerNonUserCode]
        private HyperLink __BuildControl__control12()
        {
            HyperLink link = new HyperLink {
                TemplateControl = this
            };
            link.ApplyStyleSheetSkin(this);
            link.ID = "link1";
            return link;
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control13(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("<hr />"));
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control14(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("\r\n\t"));
            HyperLink link = this.__BuildControl__control15();
            accessor.AddParsedSubObject(link);
            accessor.AddParsedSubObject(new LiteralControl("<br />\r\n"));
        }

        [DebuggerNonUserCode]
        private HyperLink __BuildControl__control15()
        {
            HyperLink link = new HyperLink {
                TemplateControl = this
            };
            link.ApplyStyleSheetSkin(this);
            link.ID = "link1";
            return link;
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control16(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("<hr />"));
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control2(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("\r\n\t"));
            HyperLink link = this.__BuildControl__control3();
            accessor.AddParsedSubObject(link);
            accessor.AddParsedSubObject(new LiteralControl("<br />\r\n"));
        }

        [DebuggerNonUserCode]
        private HyperLink __BuildControl__control3()
        {
            HyperLink link = new HyperLink {
                TemplateControl = this
            };
            link.ApplyStyleSheetSkin(this);
            link.ID = "link1";
            return link;
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control4(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("<hr />"));
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control5(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("\r\n\t"));
            HyperLink link = this.__BuildControl__control6();
            accessor.AddParsedSubObject(link);
            accessor.AddParsedSubObject(new LiteralControl("<br />\r\n"));
        }

        [DebuggerNonUserCode]
        private HyperLink __BuildControl__control6()
        {
            HyperLink link = new HyperLink {
                TemplateControl = this
            };
            link.ApplyStyleSheetSkin(this);
            link.ID = "link1";
            return link;
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control7(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("<hr />"));
        }

        [DebuggerNonUserCode]
        private void __BuildControl__control8(Control __ctrl)
        {
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("\r\n\t"));
            HyperLink link = this.__BuildControl__control9();
            accessor.AddParsedSubObject(link);
            accessor.AddParsedSubObject(new LiteralControl("<br />\r\n"));
        }

        [DebuggerNonUserCode]
        private HyperLink __BuildControl__control9()
        {
            HyperLink link = new HyperLink {
                TemplateControl = this
            };
            link.ApplyStyleSheetSkin(this);
            link.ID = "link1";
            return link;
        }

        [DebuggerNonUserCode]
        private Repeater __BuildControlrepeater1()
        {
            Repeater repeater = new Repeater();
            base.repeater1 = repeater;
            repeater.ItemTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control2));
            repeater.FooterTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control4));
            repeater.ID = "repeater1";
            repeater.ItemDataBound += new RepeaterItemEventHandler(this.repeater1_ItemDataBound);
            return repeater;
        }

        [DebuggerNonUserCode]
        private Repeater __BuildControlrepeater2()
        {
            Repeater repeater = new Repeater();
            base.repeater2 = repeater;
            repeater.ItemTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control5));
            repeater.FooterTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control7));
            repeater.ID = "repeater2";
            repeater.ItemDataBound += new RepeaterItemEventHandler(this.repeater1_ItemDataBound);
            return repeater;
        }

        [DebuggerNonUserCode]
        private Repeater __BuildControlrepeater3()
        {
            Repeater repeater = new Repeater();
            base.repeater3 = repeater;
            repeater.ItemTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control8));
            repeater.FooterTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control10));
            repeater.ID = "repeater3";
            repeater.ItemDataBound += new RepeaterItemEventHandler(this.repeater1_ItemDataBound);
            return repeater;
        }

        [DebuggerNonUserCode]
        private Repeater __BuildControlrepeater4()
        {
            Repeater repeater = new Repeater();
            base.repeater4 = repeater;
            repeater.ItemTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control11));
            repeater.FooterTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control13));
            repeater.ID = "repeater4";
            repeater.ItemDataBound += new RepeaterItemEventHandler(this.repeater1_ItemDataBound);
            return repeater;
        }

        [DebuggerNonUserCode]
        private Repeater __BuildControlrepeater5()
        {
            Repeater repeater = new Repeater();
            base.repeater5 = repeater;
            repeater.ItemTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control14));
            repeater.FooterTemplate = new CompiledTemplateBuilder(new BuildTemplateMethod(this.__BuildControl__control16));
            repeater.ID = "repeater5";
            repeater.ItemDataBound += new RepeaterItemEventHandler(this.repeater1_ItemDataBound);
            return repeater;
        }

        [DebuggerNonUserCode]
        private void __BuildControlTree(testpage_webfrompage_aspx __ctrl)
        {
            __ctrl.EnableViewState = false;
            __ctrl.EnableViewStateMac = false;
            this.InitializeCulture();
            IParserAccessor accessor = __ctrl;
            accessor.AddParsedSubObject(new LiteralControl("\r\n\r\n<html xmlns=\"http://www.w3.org/1999/xhtml\">\r\n<head>\r\n    <title>PagePerformanceTest   http://www.cnblogs.com/fish-li/</title>\r\n</head>\r\n<body>\r\n\r\n<p>This is WebFromPage.aspx</p>\r\n\r\n"));
            Repeater repeater = this.__BuildControlrepeater1();
            accessor.AddParsedSubObject(repeater);
            accessor.AddParsedSubObject(new LiteralControl("\r\n\r\n"));
            Repeater repeater2 = this.__BuildControlrepeater2();
            accessor.AddParsedSubObject(repeater2);
            accessor.AddParsedSubObject(new LiteralControl("\r\n\r\n"));
            Repeater repeater3 = this.__BuildControlrepeater3();
            accessor.AddParsedSubObject(repeater3);
            accessor.AddParsedSubObject(new LiteralControl("\r\n\r\n"));
            Repeater repeater4 = this.__BuildControlrepeater4();
            accessor.AddParsedSubObject(repeater4);
            accessor.AddParsedSubObject(new LiteralControl("\r\n\r\n"));
            Repeater repeater5 = this.__BuildControlrepeater5();
            accessor.AddParsedSubObject(repeater5);
            accessor.AddParsedSubObject(new LiteralControl("\r\n\r\n\r\n</body>\r\n</html>\r\n"));
        }

        [DebuggerNonUserCode]
        protected override void FrameworkInitialize()
        {
            base.FrameworkInitialize();
            this.__BuildControlTree(this);
            base.AddWrappedFileDependencies(__fileDependencies);
            base.Request.ValidateInput();
        }

        [DebuggerNonUserCode]
        public override int GetTypeHashCode()
        {
            return -781896338;
        }

        [DebuggerNonUserCode]
        public override void ProcessRequest(HttpContext context)
        {
            base.ProcessRequest(context);
        }

        protected override bool SupportAutoEvents
        {
            get
            {
                return false;
            }
        }
    }
}

　　从这个编译结果我们可以看出：页面上的所有文字最后也被包装到LiteralControl中。

　　页面中呈现时，就是循环调用每个控件的Render方法来最终生成HTML结果。

　　测试用例2的页面被编译成这个样了：

namespace ASP
{
    using System;
    using System.Diagnostics;
    using System.Runtime.CompilerServices;
    using System.Web;
    using System.Web.Profile;
    using System.Web.UI;

    [CompilerGlobalScope]
    public class testpage_inlinepage_aspx : Page, IHttpHandler
    {
        private static object __fileDependencies;
        private static bool __initialized;

        [DebuggerNonUserCode]
        public testpage_inlinepage_aspx()
        {
            base.AppRelativeVirtualPath = "~/TestPage/InlinePage.aspx";
            if (!__initialized)
            {
                string[] virtualFileDependencies = new string[] { "~/TestPage/InlinePage.aspx" };
                __fileDependencies = base.GetWrappedFileDependencies(virtualFileDependencies);
                __initialized = true;
            }
            base.Server.ScriptTimeout = 0x1c9c380;
        }

        [DebuggerNonUserCode]
        private void __BuildControlTree(testpage_inlinepage_aspx __ctrl)
        {
            __ctrl.EnableViewState = false;
            __ctrl.EnableViewStateMac = false;
            this.InitializeCulture();
            __ctrl.SetRenderMethodDelegate(new RenderMethod(this.__Render__control1));
        }

        private void __Render__control1(HtmlTextWriter __w, Control parameterContainer)
        {
            __w.Write("\r\n\r\n<html xmlns=\"http://www.w3.org/1999/xhtml\">\r\n<head>\r\n    <title>PagePerformanceTest   http://www.cnblogs.com/fish-li/</title>\r\n</head>\r\n<body>\r\n\r\n<p>This is InlinePage.aspx</p>\r\n\r\n");
            foreach (BlogInfo info in XmlDb.Blogs)
            {
                __w.Write("\r\n\t<a href=\"");
                __w.Write(info.Href);
                __w.Write("\" target=\"_blank\">");
                __w.Write(info.Title);
                __w.Write("</a><br />\r\n");
            }
            __w.Write("\r\n<hr />\r\n\r\n");
            foreach (BlogInfo info2 in XmlDb.Blogs)
            {
                __w.Write("\r\n\t<a href=\"");
                __w.Write(info2.Href);
                __w.Write("\" target=\"_blank\">");
                __w.Write(info2.Title);
                __w.Write("</a><br />\r\n");
            }
            __w.Write("\r\n<hr />\r\n\r\n");
            foreach (BlogInfo info3 in XmlDb.Blogs)
            {
                __w.Write("\r\n\t<a href=\"");
                __w.Write(info3.Href);
                __w.Write("\" target=\"_blank\">");
                __w.Write(info3.Title);
                __w.Write("</a><br />\r\n");
            }
            __w.Write("\r\n<hr />\r\n\r\n");
            foreach (BlogInfo info4 in XmlDb.Blogs)
            {
                __w.Write("\r\n\t<a href=\"");
                __w.Write(info4.Href);
                __w.Write("\" target=\"_blank\">");
                __w.Write(info4.Title);
                __w.Write("</a><br />\r\n");
            }
            __w.Write("\r\n<hr />\r\n\r\n");
            foreach (BlogInfo info5 in XmlDb.Blogs)
            {
                __w.Write("\r\n\t<a href=\"");
                __w.Write(info5.Href);
                __w.Write("\" target=\"_blank\">");
                __w.Write(info5.Title);
                __w.Write("</a><br />\r\n");
            }
            __w.Write("\r\n<hr />\r\n\r\n</body>\r\n</html>\r\n");
        }

        [DebuggerNonUserCode]
        protected override void FrameworkInitialize()
        {
            base.FrameworkInitialize();
            this.__BuildControlTree(this);
            base.AddWrappedFileDependencies(__fileDependencies);
            base.Request.ValidateInput();
        }

        [DebuggerNonUserCode]
        public override int GetTypeHashCode()
        {
            return -1307842476;
        }

        [DebuggerNonUserCode]
        public override void ProcessRequest(HttpContext context)
        {
            base.ProcessRequest(context);
        }

        protected global_asax ApplicationInstance
        {
            get
            {
                return (global_asax) this.Context.ApplicationInstance;
            }
        }

        protected DefaultProfile Profile
        {
            get
            {
                return (DefaultProfile) this.Context.Profile;
            }
        }

        protected override bool SupportAutoEvents
        {
            get
            {
                return false;
            }
        }
    }
}

　　请注意下面这段关键的代码：它们实在太重要了。



private void __BuildControlTree(testpage_inlinepage_aspx __ctrl)

　　{

　　// .......

　　__ctrl.SetRenderMethodDelegate(new RenderMethod(this.__Render__control1));

　　}

　　private void __Render__control1(HtmlTextWriter __w, Control parameterContainer)

　　{}

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