C#执行Javascript代码的几种方法

一、开源项目 Javascript .NET

地址: http://javascriptdotnet.codeplex.com/ 它是Google Chrome V8引擎在.NET上的封装，功能完善，性能相对较高，推荐使用! (缺点就是asp.net web应用上，好象会报错)

示例代码：

using Noesis.Javascript;
using System;
using System.Collections.Generic;

namespace JsCSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            using (JavascriptContext ctx = new JavascriptContext())
            {
                var i = ctx.Run("1+2");
                Console.WriteLine(i);//3
                ctx.Run("var d = new Date(2013,9-1,2,20,30,15)");
                var d = ctx.GetParameter("d");
                Console.WriteLine(d);//2013/9/2 20:30:15
                var j = ctx.Run("function add(x,y){return x+y;};add(5,10);");
                Console.WriteLine(j);//15
                ctx.Run("var obj = {};obj.name='jimmy';obj.sex='Male';obj.name='杨俊明'");
                var obj = ctx.GetParameter("obj") as Dictionary<string, object>;
                foreach (var key in obj.Keys)
                {
                    Console.WriteLine(string.Format("{0}:{1}", key, obj[key]));
                    //name:杨俊明
                    //sex:Male
                }
                var jsonArr = ctx.Run("[{Airport:'PEK',Name:'北京首都机场'},{Airport:'XIY',Name:'西安咸阳机场'}]") as Array;
                foreach (var item in jsonArr)
                {
                    var json = item as Dictionary<string, object>;
                    foreach (var key in json.Keys)
                    {
                        Console.WriteLine(string.Format("{0}:{1}", key, json[key]));
                        //Airport:PEK
                        //Name:北京首都机场
                        //Airport:XIY
                        //Name:西安咸阳机场
                    }
                }
                ctx.SetParameter("x", 7);
                ctx.Run("function add(x,y){return x+y;}; function sub(x,y){return x-y;};k = add(2,x);var t = sub(9,1);");
                var k = ctx.GetParameter("k");
                Console.WriteLine(k);//9
                var t = ctx.GetParameter("t");
                Console.WriteLine(t);//8
                Console.Read();
            }

        }

    }
}

部署时要注意，msvcp100.dll、msvcr100.dll这二个文件，要复制到bin目录下

二、利用Microsoft.JScript.Vsa

先添加Microsoft.JScript、Microsoft.Vsa二个程序集的引用，然后就能用了，示例代码如下:

using Microsoft.JScript;
using Microsoft.JScript.Vsa;
using System;

namespace JsCSharp
{
    class Program
    {
        static VsaEngine Engine = VsaEngine.CreateEngine();

        static void Main(string[] args)
        {
            var i = (int)EvalJScript("1+2;");
            Console.WriteLine(i);//3
            var d = (DateObject)EvalJScript("var d = new Date(2013,9-1,2,20,30,15)");
            Console.WriteLine(d);//Mon Sep 2 20:30:15 UTC+8 2013
            var j = EvalJScript("function add(x,y){return x+y;};add(5,10);");
            Console.WriteLine(j);//15
            var obj = EvalJScript("var obj = {};obj.name='jimmy';obj.sex='Male';");
            Console.WriteLine(obj);//Male 注：只返回最后一条执行的语句结果
            Console.Read();
        }

        static object EvalJScript(string JScript)
        {
            object Result = null;
            try
            {
                Result = Microsoft.JScript.Eval.JScriptEvaluate(JScript, Engine);
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
            return Result;

        }
    }
}

Vsa的功能比较有限，多条语句执行时，只返回最后一条语句的执行结果。