[LinqPad妙用]－在Net MVC中反射调用LinqPad中的Dump函数_.NET_编程开发_程序员俱乐部

LinqPad有个非常强大的Dump函数。这篇讲解一下如何将Dump函数应用在.Net MVC Web开发中。

先看效果：

　一、用.Net Reflector反编译LinqPad.exe，找出Dump函数的定义：

　　经过反编译发现，Dump函数调用了LINQPad.ObjectGraph.Formatters.XhtmlWriter类中FormatObject函数，把对象转成了Html。

　二、反射调用FormatObject函数：

　　由于FormatObject函数是protect类型，不能直接调用，只能反射了。
　　

　三、在.Net MVC中使用Dump：

 BigDump.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
using System.Reflection;
using System.IO;
using System.Text;

namespace System.Web
{
    public static class BigDump
    {
        private static MethodInfo dumpMethodInfo = null;
        private static object xhtmlWriterInstance = null;
        private static void Init()
        {
            if (dumpMethodInfo == null || xhtmlWriterInstance == null)
            {
                var asm = Assembly.LoadFile(HttpContext.Current.Server.MapPath("~/Lib/LINQPad.exe"));
                Type t1 = asm.GetType("LINQPad.ObjectGraph.Formatters.XhtmlWriter");
                ConstructorInfo t1Constructor = t1.GetConstructor(new Type[] { typeof(TextWriter), typeof(bool) });
                xhtmlWriterInstance = t1Constructor.Invoke(new Object[] { new StringWriter(new StringBuilder()), false });
                dumpMethodInfo = t1.GetMethod("FormatObject", BindingFlags.Instance | BindingFlags.NonPublic);
            }
        }
        public static MvcHtmlString Render<T>(this T o, string description = "", int? depth = 3)
        {
            Init();
            var result = dumpMethodInfo.Invoke(xhtmlWriterInstance, new Object[] { o, description, depth, new TimeSpan() });
            return new MvcHtmlString(result as string);
        }

        public static List<MvcHtmlString> Stack { get; set; }
        static BigDump()
        {
            Stack = new List<MvcHtmlString>();
        }
        public static T Dump<T>(this T o, string description = "", int? depth = 3)
        {
            Stack.Add(o.Render(description, depth));
            return o;
        }
        public static void Clear()
        {
            Stack = new List<MvcHtmlString>();
        }
        public static MvcHtmlString Flush()
        {
            var html = new MvcHtmlString(string.Join("\r\n", Stack.Select(r => r.ToHtmlString()).ToArray()));
            Clear();
            return html;

        }
    }
}

linqpad.css

body {
            margin: 0.3em 0.3em 0.4em 0.5em;
            font-family: Verdana;
            font-size: 50%;
            background: white;
        }

        p, pre {
            margin: 0;
            padding: 0;
            font-family: Verdana;
        }

        table {
            border-collapse: collapse;
            border: 2px solid #17b;
            border-top: 1px;
            margin: 0.3em 0.2em;
        }

            table.limit {
                border-collapse: collapse;
                border-bottom: 2px solid #c31;
            }

        td, th {
            vertical-align: top;
            border: 1px solid #aaa;
            padding: 0.1em 0.2em;
            margin: 0;
        }

        th {
            text-align: left;
            background-color: #ddd;
            border: 1px solid #777;
            font-family: tahoma;
            font-size: 90%;
            font-weight: bold;
        }

            th.member {
                padding: 0.1em 0.2em 0.1em 0.2em;
            }

        td.typeheader {
            font-family: tahoma;
            font-size: 100%;
            font-weight: bold;
            background-color: #17b;
            color: white;
            padding: 0 0.2em 0 0.1em;
        }

        td.n {
            text-align: right;
        }

        a:link.typeheader, a:visited.typeheader {
            font-family: tahoma;
            font-size: 90%;
            font-weight: bold;
            text-decoration: none;
            background-color: #17b;
            color: white;
            float: left;
        }

        span.typeglyph {
            font-family: webdings;
            padding: 0 0.2em 0 0;
            margin: 0;
        }

        table.group {
            border: none;
            margin: 0;
        }

        td.group {
            border: none;
            padding: 0 0.1em;
        }

        div.spacer {
            margin: 0.6em 0;
        }

        table.headingpresenter {
            border: none;
            border-left: 3px dotted #1a5;
            margin: 1em 0em 1.2em 0.15em;
        }

        th.headingpresenter {
            font-family: Arial;
            border: none;
            padding: 0 0 0.2em 0.5em;
            background-color: white;
            color: green;
            font-size: 110%;
        }

        td.headingpresenter {
            border: none;
            padding: 0 0 0 0.6em;
        }

        td.summary {
            background-color: #def;
            color: #024;
            font-family: Tahoma;
            padding: 0 0.1em 0.1em 0.1em;
        }

        td.columntotal {
            font-family: Tahoma;
            background-color: #eee;
            font-weight: bold;
            color: #17b;
            font-size: 90%;
            text-align: right;
        }

        span.graphbar {
            background: #17b;
            color: #17b;
            margin-left: -2px;
            margin-right: -2px;
        }

        a:link.graphcolumn, a:visited.graphcolumn {
            color: #17b;
            text-decoration: none;
            font-weight: bold;
            font-family: Arial;
            font-size: 110%;
            letter-spacing: -0.4em;
            margin-left: 0.3em;
        }

        i {
            color: green;
        }

        em {
            color: red;
        }

        span.highlight {
            background: #ff8;
        }