Expression基础体验
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks; namespace Unit
{
class T
{
public void Test()
{
Console.WriteLine("Test Class!");
}
}
class S
{
private List<int> ids = new List<int>();
public string Name { set; get; } public List<int> Ids { set { ids = value; } get { return ids; } }
}
class ET
{
public void Run()
{
//add
Add(, );//+
AddAssign(, );
Subtract(, );//-
SubtractAssign(,);
Multiply(,);
MultiplyAssign(,);
Divide(, );
DivideAssign(,);
Decrement();//i--;
Increment();//++
Modulo(); And(true, false); //&
AndAlso(true, false); //&&
Or(true, false);
OrElse(true, false); //||
LessThan(, );
Coalesce(, );
Coalesce(null, );
Is();
If();
IfElse();
Condition();
Switch();
Loop();
TypeAs();
Convert();
New();
NewArray();
NewArrayBounds();
ListInit();
ListBind();
}
/// <summary>
/// +
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void Add(int a,int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.Add(left, right);
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
} public static int Add2(int a,int b)
{
return ;
} /// <summary>
/// 利用方法+
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void AddAssign(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.AddAssign(left, right, this.GetType().GetMethod("Add2"));
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// &
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void And(bool a, bool b)
{
var left = Expression.Parameter(typeof(bool));
var right = Expression.Parameter(typeof(bool));
Expression exp = Expression.And(left, right);
Expression<Func<bool, bool, bool>> lambda = Expression.Lambda<Func<bool, bool, bool>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// &&
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void AndAlso(bool a, bool b)
{
var left = Expression.Parameter(typeof(bool));
var right = Expression.Parameter(typeof(bool));
Expression exp = Expression.AndAlso(left, right);
Expression<Func<bool, bool, bool>> lambda = Expression.Lambda<Func<bool, bool, bool>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// |
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void Or(bool a, bool b)
{
var left = Expression.Parameter(typeof(bool));
var right = Expression.Parameter(typeof(bool));
Expression exp = Expression.Or(left, right);
Expression<Func<bool, bool, bool>> lambda = Expression.Lambda<Func<bool, bool, bool>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// ||
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void OrElse(bool a, bool b)
{
var left = Expression.Parameter(typeof(bool));
var right = Expression.Parameter(typeof(bool));
Expression exp = Expression.OrElse(left, right);
Expression<Func<bool, bool, bool>> lambda = Expression.Lambda<Func<bool, bool, bool>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
} /// <summary>
/// -
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void Subtract(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.Subtract(left, right);
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
private void SubtractAssign(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.SubtractAssign(left, right, this.GetType().GetMethod("Add2"));
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
} /// <summary>
/// *
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void Multiply(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.Multiply(left, right);
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
private void MultiplyAssign(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.MultiplyAssign(left, right, this.GetType().GetMethod("Add2"));
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// /
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void Divide(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.Divide(left, right);
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// a/=b
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void DivideAssign(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.DivideAssign(left, right, this.GetType().GetMethod("Add2"));
Expression<Func<int, int, int>> lambda = Expression.Lambda<Func<int, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
}
/// <summary>
/// --
/// </summary>
/// <param name="a"></param>
private void Decrement(int a)
{
var left = Expression.Parameter(typeof(int));
Expression exp = Expression.Decrement(left);
Expression<Func<int, int>> lambda = Expression.Lambda<Func<int, int>>(exp, new ParameterExpression[] { left });
var l = lambda.Compile();
var r = l(a);
Console.WriteLine(r);
}
/// <summary>
/// ++
/// </summary>
/// <param name="a"></param>
private void Increment(int a)
{
var left = Expression.Parameter(typeof(int));
Expression exp = Expression.Increment(left);
Expression<Func<int, int>> lambda = Expression.Lambda<Func<int, int>>(exp, new ParameterExpression[] { left });
var l = lambda.Compile();
var r = l(a);
Console.WriteLine(r);
}
/// <summary>
/// >
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void LessThan(int a, int b)
{
var left = Expression.Parameter(typeof(int));
var right = Expression.Parameter(typeof(int));
Expression exp = Expression.LessThan(left, right);
Expression<Func<int, int, bool>> lambda = Expression.Lambda<Func<int, int, bool>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a,b);
Console.WriteLine(r);
}
/// <summary>
/// ??
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
private void Coalesce(int? a, int b)
{
var left = Expression.Parameter(typeof(int?));
var right = Expression.Parameter(typeof(int)); var right2 = Expression.Assign(right, Expression.Default(typeof(int)));
Expression exp = Expression.Coalesce(left, right2);
Expression<Func<int?, int, int>> lambda = Expression.Lambda<Func<int?, int, int>>(exp, new ParameterExpression[] { left, right });
var l = lambda.Compile();
var r = l(a, b);
Console.WriteLine(r);
} public static bool IsFalse(bool flag){
return false;
}
/// <summary>
/// is
/// </summary>
private void Is()
{
var v1 = Expression.Parameter(typeof(bool)); var v11 = Expression.Assign(v1,Expression.Constant(true));
var v2 = Expression.IsFalse(v1, this.GetType().GetMethod("IsFalse"));
Expression exp = Expression.IsFalse(v2);
var v3=Expression.TypeIs(Expression.Constant(new List<int>()),typeof(IList<int>));
Expression<Func<bool,bool>> lambda = Expression.Lambda<Func<bool,bool>>(exp, new ParameterExpression[] {v1 });
var l = lambda.Compile();
var r = l(true);
Console.WriteLine(r);
Expression<Func<bool>> lambda2 = Expression.Lambda<Func<bool>>(v3);
var l2 = lambda2.Compile();
Console.WriteLine(l2());
}
/// <summary>
/// if
/// </summary>
private void If()
{
var v1 = Expression.Variable(typeof(int),"a");
var v11 = Expression.Assign(v1, Expression.Constant());
var v2 = Expression.GreaterThan(v11, Expression.Constant());
Expression exp = Expression.IfThen(v2,Expression.Call(typeof(Console).GetMethod("WriteLine",new Type[]{typeof(int)}),v1));
Expression exp2 = Expression.Block(new[]{v1},exp);
Expression<Action> lambda = Expression.Lambda<Action>(exp2, new ParameterExpression[] { });
var l = lambda.Compile();
l();
} /// <summary>
/// if else
/// </summary>
private void IfElse()
{
var v1 = Expression.Variable(typeof(int), "a");
var v11 = Expression.Assign(v1, Expression.Constant());
var v2 = Expression.GreaterThan(v11, Expression.Constant());
Expression exp = Expression.IfThenElse(v2, Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("True")), Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("False")));
Expression exp2 = Expression.Block(new[] { v1 }, exp);
Expression<Action> lambda = Expression.Lambda<Action>(exp2, new ParameterExpression[] { });
var l = lambda.Compile();
l();
} /// <summary>
/// trueTest?ifTrue:ifFalse;
/// </summary>
private void Condition()
{
var v1 = Expression.Variable(typeof(int), "a");
var v11 = Expression.Assign(v1, Expression.Constant());
var v2 = Expression.GreaterThan(v1, Expression.Constant());
Expression exp = Expression.Condition(v2, Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("True")), Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("False")));
Expression exp2 = Expression.Block(new[] { v1 },v11, exp);
Expression<Action> lambda = Expression.Lambda<Action>(exp2, new ParameterExpression[] { });
var l = lambda.Compile();
l();
}
/// <summary>
/// switch
/// </summary>
/// <param name="i"></param>
private void Switch(int i)
{
var par = Expression.Parameter(typeof(int));
var target = Expression.Label(typeof(int),"a");
var exp = Expression.Switch(par, Expression.Break(target, Expression.Constant(-)), Expression.SwitchCase(Expression.Break(target, par), Expression.Constant()));
var lbl = Expression.Label(target, Expression.Constant());
var block = Expression.Block(exp,lbl);
Expression<Func<int, int>> lambda = Expression.Lambda<Func<int, int>>(block, new ParameterExpression[] { par });
var l = lambda.Compile();
Console.WriteLine(l(i));
}
/// <summary>
/// while(true){}
/// </summary>
/// <param name="i"></param>
private void Loop(int i)
{
var par = Expression.Parameter(typeof(int));
var ret = Expression.Variable(typeof(int), "ret");
var v11 = Expression.Assign(ret, Expression.Constant());
var lbl = Expression.Label(typeof(int));
var lbl2 = Expression.Label(lbl,Expression.Constant());
var block1 = Expression.Block(Expression.AddAssign(ret,par),Expression.SubtractAssign(par,Expression.Constant()));
var condition = Expression.IfThenElse(Expression.GreaterThan(par, Expression.Constant()),block1, Expression.Break(lbl, ret));
var block2 = Expression.Block(new[] { ret }, v11, Expression.Loop(condition), lbl2);// Expression.Block(new[] { ret }, v11, Expression.Loop(condition,lbl)) 可以达到一样的效果
Expression<Func<int, int>> lambda = Expression.Lambda<Func<int, int>>(block2, new ParameterExpression[] { par });
var l = lambda.Compile();
Console.WriteLine(l(i));
} /// <summary>
/// as
/// </summary>
private void TypeAs()
{
Expression s = Expression.Constant();
var t=Expression.TypeAs(s, typeof(object));
var call = Expression.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(int) }), Expression.Unbox(t, typeof(int)));
Expression<Action> lambda = Expression.Lambda<Action>(call);
var l=lambda.Compile();
l();
} /// <summary>
/// 强转 class定义TypeConverter,TypeConverterAttribute
/// </summary>
private void Convert()
{
Expression s = Expression.Constant(7.5);
var t = Expression.Convert(s, typeof(int));
var call = Expression.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(int) }),t);
Expression<Action> lambda = Expression.Lambda<Action>(call);
var l = lambda.Compile();
l();
} /// <summary>
/// %
/// </summary>
private void Modulo()
{
Expression s1 = Expression.Constant();
Expression s2 = Expression.Constant();
var t = Expression.Modulo(s1,s2); Expression<Func<int>> lambda = Expression.Lambda<Func<int>>(t);
var l = lambda.Compile();
Console.WriteLine(l());
} /// <summary>
/// new
/// </summary>
private void New()
{
Expression s = Expression.Constant();
var t = Expression.New(typeof(T));
var call = Expression.Call(t, typeof(T).GetMethod("Test"));
Expression<Action> lambda = Expression.Lambda<Action>(call);
var l = lambda.Compile();
l();
} /// <summary>
/// 初始化数组对象new int[]{7}
/// </summary>
private void NewArray()
{
Expression s = Expression.Constant();
var t = Expression.NewArrayInit(typeof(int),s);
var call = Expression.Call(t, typeof(int[]).GetProperty("Length").GetGetMethod());
Expression<Func<int>> lambda = Expression.Lambda<Func<int>>(call);
var l = lambda.Compile();
Console.WriteLine(l());
} /// <summary>
/// new int[7]
/// </summary>
private void NewArrayBounds()
{
Expression s = Expression.Constant();
var t = Expression.NewArrayBounds(typeof(int), s);
var call = Expression.Call(t, typeof(int[]).GetProperty("Length").GetGetMethod());
Expression<Func<int>> lambda = Expression.Lambda<Func<int>>(call);
var l = lambda.Compile();
Console.WriteLine(l());
}
/// <summary>
/// new List<int>(){5}
/// </summary>
private void ListInit()
{
Expression s = Expression.Constant();
var lst = Expression.New(typeof(List<int>));
var t = Expression.ListInit(lst,s);
var call = Expression.Call(t, typeof(List<int>).GetProperty("Count").GetGetMethod());
Expression<Func<int>> lambda = Expression.Lambda<Func<int>>(call);
var l = lambda.Compile();
Console.WriteLine(l());
}
/// <summary>
/// var s=new S();s.Ids.Add(5);s.Ids.Add(7);
/// </summary>
private void ListBind()
{
Type s = typeof(S);
var n=Expression.New(s);
var ids=s.GetProperty("Ids");
var l=typeof(List<int>);
var n2 = Expression.New(l);
var e1 = Expression.ElementInit(l.GetMethod("Add"), Expression.Constant());
var e2 = Expression.ElementInit(l.GetMethod("Add"), Expression.Constant());
var lst = Expression.ListBind(ids,e1,e2);
var init=Expression.MemberInit(n,lst);
Expression<Func<S>> lambda = Expression.Lambda<Func<S>>(init);
var ln = lambda.Compile();
var o = ln();
Console.WriteLine(o);
}
/// <summary>
/// L_0000: ldarg.1
/// L_0001: call void [mscorlib]System.Console::WriteLine(int32)
/// L_0006: ldarg.s j2
/// L_0008: call void [mscorlib]System.Console::WriteLine(int32)
/// L_000d: ret
/// </summary>
private void TestArgs(int a, int b, int c, int d, int e, int f, int g, int h, int i, int j, int a1, int b1, int c1, int d1, int e1, int f1, int g1, int h1, int i1, int j1, int a2, int b2, int c2, int d2, int e2, int f2, int g2, int h2, int i2, int j2)
{ Console.WriteLine(a);
Console.WriteLine(j2);
}
}
}
Expression基础体验的更多相关文章
- Java 8 新特性之 Stream 流基础体验
Java 8 新特性之 Stream 流基础体验 package com.company; import java.util.ArrayList; import java.util.List; imp ...
- 零基础学习python 你该怎么做
本人文科生,回顾自己近 2 年的Python 自学经历,有一些学习心得和避坑经验分享给大家,让大家在学习 Python 的过程中少走一些弯路!减少遇到不必要的学习困难! 首先,最开始最大的困难应该就是 ...
- CI Weekly #4 | 不同规模的团队，如何做好持续集成？
CI Weekly 围绕『 软件工程效率提升』 进行一系列技术内容分享,包括国内外持续集成.持续交付,持续部署.自动化测试. DevOps 等实践教程.工具与资源,以及一些工程师文化相关的程序员 Ti ...
- MVC验证01-基础、远程验证
本文体验MVC服务端和客户端验证.主要涉及:※ 基础验证※ 远程验证1个或多个属性及注意点 基础体验 创建MVC4的Internet项目,本身包含了基本的Model,Views,Controller. ...
- H5 App设计者需要注意的21条禁忌
我们通常在做H5 APP设计的过程中,遇到很多看似很小,且很容易被忽略的问题,正是这些小问题,一次次的撩拨用户的耐心,让用户对你的APP心生怨念.现在WeX5君呕血为大家整理出H5 APP设计的21条 ...
- android 类似QQ底部输入框弹出键盘和面板冲突 布局闪动处理方案(转)
先看下效果 差不多就是解决这种冲突,布局闪动的 作者的githup :https://github.com/Jacksgong/JKeyboardPanelSwitch Android键盘面板冲突 布 ...
- 01Vue数据双向绑定
Vue作为前端MV*架构,Vue.js (读音 /vjuː/,类似于 view) 是一套构建用户界面的渐进式框架.与其他重量级框架不同的是,Vue 采用自底向上增量开发的设计. Vue 的核心库只关注 ...
- QQ音乐的动效歌词是如何实践的？
本文由云+社区发表 作者:QQ音乐技术团队 一. 背景 1. 现状 歌词浏览已经成为音乐app的标配,展示和动画效果也基本上大同小异,主要是单行的逐字染色的卡拉OK效果和多行的滚动效果.当然,我们也不 ...
- Java 11 正式发布，这 8 个逆天新特性教你写出更牛逼的代码
美国时间 09 月 25 日,Oralce 正式发布了 Java 11,这是据 Java 8 以后支持的首个长期版本. 为什么说是长期版本,看下面的官方发布的支持路线图表. 可以看出 Java 8 扩 ...
随机推荐
- Visual Studio 2019 16.0 正式版下载
Visual Studio 2019 16.0 最新版 现在流行 官方版直接下载 在线选择性安装https://www.visualstudio.com/zh-hans/downloads/ Vis ...
- github爬虫100项目
为了更好的巩固所学,在github上开始100爬虫项目,记录学习过程,也希望对他人的学习有帮助,目前还在持续更新中,有兴趣可以看看 地址: https://github.com/mapyJJJ/100 ...
- Sitecore 8.2 页面架构设计：模板与组件
介绍 Sitecore的开放式架构和众多API意味着在Sitecore中实施网站可能会在很多方向上发生偏差.架构的一个特别重要的方面涉及页面构建 - 如何构建Sitecore中的网页? Sitecor ...
- SQL kaggle learn : WHERE AND
WHERE trip_start_timestamp Between '2017-01-01' And '2017-07-01' and trip_seconds > 0 and trip_mi ...
- Java EE开发技术课程
新的学期开始了,j2e已经上了两节课,接下来就是对该课程的一些作业以及相关的认识: 一.课程目标: Java EE是java的企业级应用,所以在我看来在学习这门课程之前肯定要对java有一个具体的认识 ...
- Linux Spi驱动移植小结
2012-01-07 22:21:29 效果图: 理论学习后,主要是linux中spi子系统设备框架的了解后,主控制器与设备分离的思想,那么我要开始动手了. 1, make menuconfig添加 ...
- tensorflow学习笔记2：c++程序静态链接tensorflow库加载模型文件
首先需要搞定tensorflow c++库,搜了一遍没有找到现成的包,于是下载tensorflow的源码开始编译: tensorflow的contrib中有一个makefile项目,极大的简化的接下来 ...
- JAVA中for与while关于内存的细节问题
文/朱季谦 JAVA的程序结构有顺序结构,循环结构,分支结构,以及跳转结构,而循环结构里经常用到的无外乎有以下几种:for循环,while循环,以及do-while循环.本文主要讨论for循环与whi ...
- 第十七节 Cookie基础与应用
什么是cookie:其实就是页面用来保存信息:比如,自动登录.记住用户名 cookie的特性:(以域名为单位的) 同一个网站(同一个域名)中所有页面共享一套cookie 数量.大小有限,跟浏览器有关, ...
- JZ2440学习笔记之中断
.extern main .text .global _start _start: @********************************************************* ...