[读行者][学习LinqExpression和Reflection(Emit)]阅读TypeBuilderSample之ExampleFromTheArticle

前言

关于”读行者“

俗语有云:"读万卷书，行万里路“。多读一些优秀代码，不仅可以锻炼我们读代码的能力（便于维护或相互交流），还可以吸取很多我们成长所需的知识点。多读，才能开阔我们的眼界，才能在我们小有所成沾沾自喜时提醒我们：前面的路还很长。

阅读是一种探索式的学习，你可以针对demo中的知识点有选择的研究；如果我们阅读的是一个project，还可以断点调试，更改前后条件，验证自己对API的猜想和加深理解。这些都比直接查阅API文档和看书效果好很多。另外，如果觉得对自己有帮助和启发的代码，还可以存下来，作为自己的积累，供今后查阅和调用。

如果有时间，我将不定期分享一些读书笔记，放在此类别下。如果有兴趣，不妨一起”读“吧。

Demo 地址:Fluent Method and Type Builder(自己下载）

研究目的: 进阶学习Linq.Expression和System.Reflection和System.Reflection.Emit。 同时这个工具在动态创建方法和类型时（如AOP），也十分有用。

点1：为什么方法中：

string fileName = null;

var method =
  new FluentMethodBuilder(typeof(void)).
  AddParameter(() => fileName).

的表达式“() => fileName”， 在AddParameter中访问时，表达式的类型是MemberExpression并且 Expression.Member.MemberType=MemberType.Field? 'fileName'明明是一个局部变量呀？

答案：见StackOverFlow

class C
{
  void M()
  {
    int x = ;
    Func<int, int> f = y=>x+y;
  }
}

实际上被编译成了：

class C
{
  private class DisplayClass
  {
    public int x;
    public int AnonymousMethod(int y)
    {
      return this.x + y;
    }
  }
  void M()
  {
    C.DisplayClass d = new C.DisplayClass();
    d.x = 1;
    Func<int, int> f = d.AnonymousMethod;
  }
}

点2： MemberExpression的基本属性：MSDN

Member: 获取表达式指向的属性或字段 [和System.Reflection第一次交互，返回类型为System.Reflection.MemberInfo]

Expression: 获取包含表达式指向的属性或字段的object

Type: 表达式里的委托的类型

NodeType: 对表达式的类型的细分，在二元操作表达式时需要用到以细分为加，减等。

断点调试中发现：

Expression:           （）=>xxx.fileName     NodeType是 Lambda

Expression.Body    xxx.fileName             NodeType是MemberAccess

Body.Expression    xxx                           NodeType是Constant

((ConstantExpression)Body.Expression).Value可以访问xxx对象，通过watch窗口，可以查看这个匿名类的属性，证明1中的结论）

点3： ParameterExpression

IsByRef: 是否是引用类型

Name: 参数名称

产生：  Expression.Parameter(fieldType, fieldName)或  Expression.Variable(fieldType, fieldName)

额外学习点：

a.生成ref参数类型: fieldType = fieldType.MakeByRefType();

b.装箱类型：  fieldType = typeof(Box<>).MakeGenericType(fieldType); （联想typeof(Nullable<>).MakeGenericType）。（如果是要从泛型类型”Box<x>“中获取Box<>类型呢？其实代码中有）

点4： Using的实现

var result =
                Expression.Block
                (
                    new ParameterExpression[]{otherVariable},
                    Expression.Assign(otherVariable, _usingValue),
                    Expression.Assign(_usingVariable, otherVariable),
                    Expression.TryFinally
                    (
                        base._CompileToExpression(),
                        Expression.IfThen
                        (
                            Expression.NotEqual(otherVariable, Expression.Constant(null)),
                            Expression.Block
                            (
                                Expression.Assign(_usingVariable, Expression.Constant(null, _usingVariable.Type)),
                                Expression.Call(otherVariable, _disposeMethod)
                            )
                        )
                    )
                );

可以看见Using语句的实现，在LinqExpression中本质上使用的是TryFinally(expBody,expFinally)。

额外知识点：

a. Expression可以把语句组装起来一起执行；

b. 赋值操作和If语句的实现： Expression.Assign和Expression.IfThen。 Demo中_usingValue的类型为MemberAccess, 即xxx.StreamReader；

c. 和System.Reflection的第二次交互: Expression.Call(varableExp, methodInfo)。

点5： 循环语句的实现

var innerBody = base._CompileToExpression();
            var result =
                Expression.Block
                (
                    Expression.Label(ContinueTarget),
                    innerBody,
                    Expression.Goto(ContinueTarget),
                    Expression.Label(BreakTarget)
                );

            return result;

可以发现，循环语句本年是通过GoTo实现的，在循环体的入口和出口创建两个Label, 执行完后让程序跳转到循环体的入口；如果执行过程中要中断程序，刚跳转至循环语句的出口。

那么，在innerBody中，必然有跳转到Break处的语句，这可以从Break（）方法看到：

_IBlockBuilder instance = this;
while(instance != null)
{
    _ILoop loop = instance as _ILoop;
    if (loop != null)
    {
        var gotoExpression = Expression.Goto(loop.BreakTarget);
        var statement = new _Expression(gotoExpression);
        _statements.Add(statement);
        return _this;
    }

    instance = instance.Parent as _IBlockBuilder;
}

其流程也需要注意一下： 从当前的Block级语句中逐级往上遍历，利用Goto BreakTarget中断离当前块最近的一级Loop循环。

点6： Expression Visitor

在FluentMethodBuilder的372行有这样一句：

body = _visitor.Visit(body);

大致看下其中的代码，尤其是VisitMember方法，好像就是在根据节点在上下文中找对应的表达式。不要它行不行？肯定不行，否则作者不会写它。

那么它到底是干啥的呢？

先把它注了看看：再F5，会报一个错误，差不多是说streamreader的参数path不能为null。好像是赋的值没有传过去，但具体这又是为什么呢？

取消先前的注释，打个断点在"visit"语句之前和之后，查看一下body的DebugView，对比一下可以发现(以第5行代码为例)：

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" 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/wAd5w+W7+PewpwJ3kECdyKEY8cRR1F8lnegFvcsj3Kvj3oJyVOLl9VtnXXVdXdfHlnYNnYTG8EblWV7wtVvu7tfv30p5P1nX/kqMpPijQ38gPcivV3gEPtCG7mmA/61h0p9UbgdgS3GvWeTCaVX9B5iYM77Rd1XyFwk3KUn+CO+QvesYE7wT2BW2N5gXuiz8dd+TWdi1BwsxM8ODgwnCmBm1SCfAQ328vGHONGtm8Xt3UncGssF3BPjPm45cLbbeEp7ebFff21uN0Omhf2Ml7HWyuBVPnWSrCy/XSv28xapwruyWTy7rvv8rN+9913UXa7gXu7HaxsRf9qu6u9la1n8PJ7F5vByopyRNCknMiytRKvQM+vTrv2LzSDxcXFoNndk5uhvfZKbSf6x81QSfPCnj/glneVdFpVIjngR+fFdwjcGssL3IZ83Oh1xi/cYGXbfEVmJoVY89ZKkHVgRALgZtQ+e/bsyc/PmM6ePYuy2xXcze7eT/sXVmLEqJ2w121GNMkD3HvdZrO7Z+yZ6TstORbn4F73glOd0/310Xq2VoKkzv0LzQCyG2lnXs1waVu2nwq/wW3ZNFLZxB3GxAncGpse3LpHKHk+btOAFIdKvkNXqjkH51EF99LSEqc2E3a+juBmyDaCO3mdA7j3LjYjbO11m7rfTsNHqbS1kvi8U7Q5k3g9+xea8u+Qeu0h7SwL3NkP5Bu4RYu4bGQ3Az1D8+EAOukEbo3lDm41H7dxQArDaa/bjFJLC37lVvRm7BxprvU9XqyLDNTE+0a+wg4neJdymZhcANwHBwcouA8ODsDQWt/5Bzpt6xbjlp0y/VnI99pRiCB+UyQ+u8XZv9AUfU/xL7LdDprtlWYQrGxhH124uOIQ5lLPQnRvZYZGuBTbnMQQolM2XhvtrZO9i01Nq+JzR1wEcHZqO0EzxJ5Rm3SytSK32d5I+Y/LfzPsNSMXvJfgDuWANWoJmtEl3sZouNEI3GnBDfJxu4FbuoibF/cjyrCrOYlN6zzQCAR7F5v8dpg7lRiUlcNxLG6tNJvRFxO3dDqPW+2fNOCOB610AwFPXOgiNQjAyou4lG9Bog7H4KV8xHsp5a19xGXlpzT+68ihLe0vtHptbK0kKERaJYAbetOKD662U4nsoczFevvEoZHK71OamsEF7zW4TS5zUoDAncKmBDejtjkftw3c3CESUkvHDg4vGcMXG8/SmJS90ciVw74CDpfEfJsXttQv4jHuN998k1P7zTfffOWVV3ShEpHdrExqj1v99ZK9yKiLENdyux00m03gS4plWIQd/QPpPsp0a7/XbQb87xjDK/ltBi1E7iqwa8PcqlQeN9pO0x2ehN1kYtPgZAD+Km1zqRm74L0Ad39HxqsSwg4PBxLE44C4Mocp10ChEsWmAbdKbTUft4lEPwmXrAY34lRSanCzkbmFfaodxvEkYXNlS/bRrKtKXnnllaWlpddffx2cNXDS+aepwa12QgpwB81mU3brpDJ4pMj0UcaY7N7FqBnsbka8p2FvKuEd67XhBm6XGDfSTgO45e8m7/DfA2dwgykHa80+gxtxljFSu7rSBG6NZQa3Sm01H7eNRMKdPgwvyu9I164QuTaGSjgIMD9OPdzJ3sWmGCRpr0g3qi7ruF9//XWV3YD16Pv6XjJ63DBUknQReostLJFUnM0kmq+wD/8oDbi3ushajr1us7nSVnzeGGG6GIUjuPGYmBxuUuIeSDsNB1LWmzqF9TRtM1yZeM2+hkpkdiPTkkkGEuu8ZUjg1tqU4NZR24ikQL6jFACBzQXBmTd+27iyIo7JeNqnq3j0yvSacrcrzICplDSBGwhld6YHcKRhrHQXchYBPE10cnL/QjOKugJXV+MnGj5K5XGjwdyTrRVhMaiygJrNyIHJSedQSRLWX9Ss4xa8b6y3hRA8GrtTmsSPxX+NUoH7ZO9iUwC0uWbkgvcF3P4YgdsKbk5tt2FcpIz3v9PI8ZF3xu6//OUv04G7lI4Ck3VwKsztoymU2zpxkp9PTlZrBG4DuN287PK0tRKkXzLsJPdcJaA3PAW3EG6uRsgyD1J2EbihEbjNk5MeUDtZAlzck8qUZCo/7V9oBjBQRppOBG5oBG7DcsD6iNK6knwWgRuaCu55MtofwFHUUSSfReCGRuB2FPZc9/xsaUbgJvksAjc0EdzzZ3nxaKLPx135NZ2LCNwkn0XghkbgtmpizMctF95oCU/0ttaLv6aHneWgsTqctp5SwL272ohnWRudQeGHszejjD8QKQ8RuKHVCtyfftbrYvbpZz3DRTMx5uOWC2+08sBo+Soc3MPOchAkoBx2VnOAZqbeXu9EX1lvB0H7RtU9T3IRgRtarcDd7Xb/i1m329VdMbpHKHk+brk8gRvV7mojKMC9nbK3Z/WPVUMRuKHVFtynTp/LAO4lJR+3XB6wYHe1ESyv7Y6Ox6P1dtDoDFiB9c5yECwuLkYfHW+0gkar1YgcwGH0aewPglt78F/hiPEXhSDARitorK612Zvx4ZBYQbHgHnaWdb6trs1D8Fo9kSQqFbQ2MraqyogNKYUI3NDqBu7//Por06nT5/jrVODmxvJxy+UFmkSo2mgF7RvRv1GBKMKbhKc3WkEgQpzfyy+v7Y7W2xKYwH8ltMVerVxzVJ5HBmAN41EJ4MYRqWszCm7lRFCXWfglMAayC7oJIBUif8B9dD7tnpNSqilrAVerIbh/94ePRBnAzahtzsctfwVDyXpb406Ob7QCg9cc+ZLDznKC9TH8L/+u7NUiNUslxRrGo6o8bvc2299MpxutIKOfTqpCfoA7TsCtz9pK4M7HVHA/fTpmOnX6HH+NglultpqPW/lWKnBzpw+AG2HcYK0hOo/Cf9ODG6uwmhh3ReAerDWI2rMlb8AtbtkeZd8e9JMSJ5evgm3dgVkLuFrdwP2v2E6dPsdfq+BWqa3m48auMBUlSKgk8nYTbAEqQXeYabDWEN+P/6sLlaA1S20TKyx8VYn068VXlaBtFii/3g7SgtsaKokmG6qHEcldfoBbMbhrO4E7JzOAWzQduN3WbouS1nEvr23wycnBWoNPTrZaDf10nISeoLXBkJcEzcF/sTBLgMM6fg1rGI/KWcctnhdHJ9JmoYWtttHjHt9oBSknJ5OJWVrKPUPyE9ws7kEed/6WeR23CG5O7TwuQU+XoNGTkySf5SO42W445hi3sm+ZtYCr1Qrc7iosLQmBm0RKLW/ALe8q6bSqRPKvrQVcjcCtUzHJpAjcJFJqeQpuy4IQdRv4tAX0RuAmjQjcJL/lDbhFi7BrZDcDvWE7YGsBjRG4SSMCN8lveQnuMMKuKU5t3cc960bvBG5HqVHvXEMoFYvATfJZXoN7KoeaPG7MKB+3owjcJJ/lBbj7O7JzrUaoDwcSguOAeIoCzkbgtmqSMh+3JpeIVdqSbLWyaOgTOtOoYHCjacrTztN6Oq9LKkG+gFt5Wn0TBbF2wZ+1gLMRuK2apMzHvSw93p0DuNNXlVrFg1t9pp/ATXKVF+AOIbuRaclHn/emLOBoBG6zdI9QmvJxr4vJ8Ajc4xQPrE/VP6S5lS/g9scI3GYBcDvm477RwtK0IrmnkzeX1zrYw+tiwik0QdV4dGxO9q2rTVJ54E6Sytp6Rpt5XI1HkeZcBG5oBG6zVHDb8nEDd9KeL5u9OVhrIAmVWEpuWHn0EYeXkFcPTfaN1iaptBi38ONh7hlhDwqpPOXRrqMI3NAI3AYxamfMxx2B1Zh2dYgFVdSU3Grl0X/jYHFUCZbsW1ubpHJj3PIviq5n4P1BNH+Q+8QsyX8RuKERuHVSqZ0yHzfzDbOBG41p4HlZheysWCzFsG2YoBJj3EoW8hTgDpYblEq7jiJwQyNwo1KpnSUf97CzHAQBHhBI0nNjoRLUr1Rm54ad5Ua71cByecuHsHqpVXrc+qzcWKhEnD8g1UUEbmgEblS6xSS2h24QpziQmKXNPY1OThpDJeMR3IILTfatq01SiTFuLFc42jPCt+TJyd3VRkCbIdRKBG5oBG5UIrhzzceds+JpSabsC+boyUmSz9KCG81EMZlMCNwzbf7l485VcPd0AjdpPoWDOxqZLwTfP7cg6t/9m4DdVYMofyNw6+Q3tXdXG0EAMU3gJs2nEHCzkclhzcOa9+/f//65hSdvnxHZXTWI8jcCN2lE4Cb5LRzcope9tLQU/vO34T9/y9kt+t1Vgyh/I3CTRgRukt+C4J5MJs82PwYPVjBwi+wmcM+oUT5uRxG4ST4LAffohUCENRBjdwHgPjqfds9JNJOUmCYwfTLukMDtpgnl4yaRqhMCbjE8YmB3nuCOE3Drk7I6gVtND0v5uIFVko9bSTydTaUmwysa3IO1Bs9SIr5OI/WRHLWXSs4gmCrToWPbdMWilFtY16E9M1dKDe7/Pf8/L774Ys4e95ODl8Ud2SOvedBPSpxcvmrZtT1O65rQ/NHnPQI3MMCjTz/rdTH79LOe4aKZpMzHneQqyYIntaoyYFRFWtds9SAJTOoA7sFa9Kw/f2HrmbkSAu4nb5/RgZtRu4QYd38HONQ2cLvsL+xmtQJ3t9v9L2bdbld3xYhP4iw55uPOgVDjuQO3mBQwM2JqC24hJyKefKZ+4J4oSTsBtUcvBAWDmwVGUnjczN3OtuUNsNqC+9TpcxnAveSWj3t0zHNk88Em3ufqMk2rLBAeFi8yudLcgXujFTRW13g6gSiMwDeBk3KCxxnMW+vjwVoDbg6nZjNHUqjj2QgMx9LXj4Ibu0LEC6xu4GbsHv+5DZYDcmozd7tQcLNQtTnGDRjNPXRxH5wMcZKwfuD+z6+/Mp06fY6/TgVubpp83MYcIywjtpBKWzss58njFp1Et2yFGu2uNkBXGMAdZ3FBYlZyMYa/9XbC0+QrajZzWwp1KOxYpmzpOnArecwlcKs9M1fSPjnJ2c0TeKrUzhPc8qaRTqtKEgc88tAvS7uX0eQkYii4f/eHj0QZwM3++lnycUNUyRmxh51lKWPfnIM7J3cbrcHocasxqzilFwZc7DX6t0P2pcP+RqZjGbKlO3vclp6ZK1lylTx5+wzj9eiF4Nnmx4DaxYHbEq2G28BzrCfRlcj1Ns5nolY3cD99OmY6dfocf42CW6V2qnzcSZpsjY/J7sptoRLDQM1TM+txy+/gOxGrv6b8Wy7gllvrCG7LsQzZ0nUxbjGTIrqwpH4ety7PVEnZAV1mGhnoo5XaDNygPPqm3eoG7n/Fdur0Of5aBbdK7fT5uKV7ZHS1Vgx3Yeppva04aLMPbnuM2/HnCvnujVaS4lVIcmsMCqORCte/nVuoBD+WS7Z051UlNY9xe5HW9XBgmWxkcDeBW12a4mS1BbdoOnC7rd1GARQPtmT0CrHv5CY6Hmz8nVZbJReb5prrycns4BZnegPEFxZfx0uhk90nrODGspkjKdQ3xPX7/MdYPZZDtnTd7zSvMD5HArcn4DY9+igXYIEROaJNHjdimddxi+D2OR93XprZddykWvSMF+Du78jONQxhh+HhQIJ4HBBPCijRlSjGnf6p91qB211q3Kzya7dQzeyTk/MqyYW3ddf894wv4FYeZ99ESW1YEfhIWVKS7XkcArdO9aH2iHKVkPyWF+AOIbsR4Mpc1hBZ5Hv69STMCNykEYGb5Ld8Abc/RuAmjQjcJL9F4IZG4HaUGvWepxAKgZvkswjc0AjcLppQPm4SqToRuKERuK2aOOfj5nmF5CW91V/3VpW4qkTIIhKp5JR+4nHbN+KFdDda8sIMmE9GUPJMDaiNr9dOqpULBA4XBrqk3cceY73ktu5lWhG4odUK3MXn4652XGVXyeu4l/mTolV210ar0Rkc7662oiRTIhyjXCJZzlGuFu8Et3qEFz72mJzJYNWpuzK2nMANrVbgLj4fd7XjKrvKfXKysbqOZvwoWQxAGIayPM8iPJ/Zyh/cPvaY9Ohm2l5KJwI3tNqCu5h83OrVKeQhSa71eChaUjOXp7LBPRRDE/Dh/mnzZWeUnDGGe0wqCA8AAAfZSURBVN/CI+nx3xF5IF54/N3QCYactIaH/r3tMZBoBb3UxdTzGzDpMZqLHGs8gRta3cBdcD5ubIgKFIhvwDfcUjMXwVBc5WUHdEpLIod30+XLFg8qTTlYQx88oaMQJ0lSSmF/KTThlE4byn6k6cDtYY/xDCrqD17Uh06p56Vc52jjCdzQagjuIvNxq1fnWPA3WYgQFtCnZi6MpIrKyscNhytMqzR9vuxpmhqlbNXmUBV+d+OjpwhfTOtx+9hjvN8C3jPypW5IPW/JRS69JnBDqxu4C87HjQ9R5solGbrRWMpUiaqnVRUeNz93kSlT58ueSrurDTma7Bu4veuxSGLWWflSjz5FbjIsucgJ3EarG7gLzsetGaLDznKS3nMsBQdNqZnLU/kx7qRngiDyFvPJly3VnPLGP0KM7CGqu/RmDpWAAo552H3tsfWO+HOSXM/SpZ50rLIxm9oSArez1RbcxeTj1g1RMcd/VMAhNXMGRGZUZeCWkJdTvuxppK7RTibQ8OBsPPWXYXLSnIddG9H2pseUycbj8Qhc6spCbym5vCkXuafgPjqfds9JnmoqTgOLSdwq3slqBe4K83HL64Ktt9Vlq8R13KQ5V/ol8Hb5AW6MvOZd3l3BTXtOyuZLPm4pGDr2EGRl5uMmzbPgpZ6PvAG3SNgoO6voLJ9cvpqSwtbNzzRG4NYpJ2rvrjYCJfpZO3CTaiD0Us9HfoBbMWW7yLTgZh566jhJSOAmHY9HBG6S3/IT3Cp2U4L7ycHLmdztkMBNOh6PCNwkv+UjuNluOOYYtxnK2fZ3Z0bgdpQa9Z428O2TCNwkn+UNuOVdJZ1WlWgd8KPzmbYJZkbgdtGE8nGTSNXJU3Bb/GV1G3jB2O6U6EcuRuC2apImH7drTmcuPLkzEzqHWcjEZingTvINpc8qV0gzcl+1RipI3oBbtIjLRnYz0CNu9dH5KXYKDmsG7sLzcU+b0xlojsCdpLOI/uuWvjlD/9jEn/dL8i6RfJeX4A4dFvMxuKvgzroKkFutwF14Pu5pczoDzQ245YSfuWnKrvBuUSZJJ6/BbYpT4wWyrwLkVltwF5OPG8/pjCZNbrXYMykJPsy5lZEEVTCdcfYgQIlJptSP9NmuwWPfa/z58l3d89bpWlVlxIaUQl6Au78j+8hqCPtwIDE6DojDQLbODU9jdQN30fm4sZzOXGiiH7fcyngyaDmdsUtIXaPCwY0jcsOY7VrpCnZ2aGpp8VhOmZIKugkgFSJfwI08rY6R2rwicJpVgNxqCO5i83GrOZ2PnZMmm4phOUVBOmOY+ziFqvG4zUlTpc6xvplOcs4vku/yAtwhZDcCX7ZWxLTmhLnbU0xLMqsbuIvPx23I6WxMmmwpxj1ES2JlIfdxClUT464I3Dx5NGlW5Au4/bG6gbuEfNwwp7Nj0mS8GJq225JYGaSxd1Hhq0rW2yCB7Wq8hZuS7dqcpXpsAbc1VJJli1tSxSJwQ6stuAvMxw2XZjsmTcaLKWm79YmVldzH7ipjHbfYWul2BGS7Nmepll5LyZ2dlMzf0lLuGRKBG1qtwF1hPm7PRU9OknwWgRtarcDtrjlOS4KKwE3yWQRuaARunepD7RGBm+S3CNzQCNykEYGb5LcI3NAI3KQRgZvktwjc0AjcpBGBm+S3CNzQCNxm1WSWksBN8lkEbmgEbp04qT+4+WXw1kfBWx99cPNLG76TzEdTrhHGU3ubkndPJQI3yWcRuKHVCtyO67gBsl/r9L745ocvvvnhtU6P41tzhUmJR6ZK95xzam+LCNwkn0XghlYrcDvm4wbIPvn52cnPzxi4F166tPCSsn9CIk32qAzKObW3RQRuks/yB9xH59PuOamkmpIzVWXMyl1bcBvycU8mEwZo0ddm76QAt5ATAyTaFtxn+fl16dFtNLW3Nhm3W51aEbhJPssPcMcJuPVZW63gdiK7i9UN3C75uDm4dXKJcWMJNIR8UnFq6eVGlBBKzQyFpfZ2SMZtrFMnAjfJZ3kDbjEda5R9W3SZTy5fNaZsVb7CvO8Me5jVENzWfNzTgRvLuQoSbccbC9xo8QSwcv5uJiS1tzEZt0udGhG4ST7LD3ArpmyJYAE3srN71t1w6gZul3zcBnC7T04m3i6SaJu92GhFeG3fwPeIUVJ7m5JxO9aJi8BN8ll+glvdOtLJ45b868MBFiu3W93A7ZKPm09Oosi2LQd0SbQ9Hqw1xIBGq9XWZdaWUnsbk3E71omKwE3yWT6CG4tywBC2Zt+y6P1ou5xMm0/WFtyGfNyZVnAzSStJBmuNIPJ/QaJtOWe3YXU2/EifjNu9TkwEbpLP8gbc8q6STqtKVAc8qST7zpO1Ard7Pu5RbZ6ZZCJwk3yWp+C2kFfdBl7YlPLlq/HulORxK0Y8chR1FMlneQNu0SIuG9nNQB+jmVFbjJ+o7zgagZs0InCT/JaX4A6xyUZg0qIRdOpSneF0MgI3aUTgJvktr8FtinVIBY7OIyFvAjdixCMSaQ7kBbj7O7JzrYawDwcSxOOAeFwgnroUykQhb8MKQo0RuEkkkufyBdzK0+qbKKm1KwKxArSOW7V7u1+TSKRZlxfgDiG7kWlJvmhEu+YEJjyhJFNa25Ht0l93zpxJ9NdL4mc7Z87snO3E//1456yupLUqMjKynMwXcPtjdQD3IzIyslm2/wdIrIztQdyJ/wAAAABJRU5ErkJggg==" />

  //visit之前
   $var1 = .New System.IO.StreamReader(.Constant<TypeBuildingSample.Program+<>c__DisplayClass0>(TypeBuildingSample.Program+<>c__DisplayClass0).fileName)

   //visit之后
   $var1 = .New System.IO.StreamReader($fileName);

这就是为什么不被visit，执行method时会报参数为null的错误的元凶了。因为之前使用的仍然是匿名类的fileName字段，而非我们传进去的参数!

再想想之前的代码：Using(() => streamReader, () => new StreamReader(fileName))，把局部变量传给了StreamReader作参数，不visit当然会出现那样的语句。

那么不使用局部变量呢？也不行，因为我们在一个方法的外部无法访问它自身的局部变量，所以作者先以上级方法的局部变量代替之，然后再把用Visitor把它恢复为“真正的局部变量”，不用再依赖上级方法中的局部变量而存在了。

所以ExpressionVisitor到底是干啥的，从这里可以看出：它可以遍历和修改Linq Expression中的子元素（语法树的子节点）。

点7： 连缀写法的实现及整体实现

首先是设计模式，整体使用组合模式， 产生树状体系。子节点实现了ICompile接口，每生成一个新的节点，都会添加到父级节点的statements中，最终遍历至根结点，生成总的 statements。如果我们正向划分也会发现：一个类可以划分为属性，方法，字段，事件的代码等，方法的代码又可以划分为循环块，条件块，using 块等，这些块又可以相互嵌套。。。

连缀写法的实现是通过EndXXX（）方法实现的，通过此方法将子节点的上级节点返回，这样可以继续调用父级节点的成员而不必中断语句。