使用需求
有时候一段Javascript代码写的很棒,而我们又无法将之翻译成.net或翻译之成本很高的时候
我们就可以使用Jint引擎来运行Javascript代码,来得到我们想要的结果
或者上
http://jint.codeplex.com/releases/view/119215
下面代码使用的 0.9.2.0 版本
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Jint; namespace JIntTest
{
/// <summary>
/// 这里一这要是 public,否则JInt无法反射
/// </summary>
public class Student
{
public string Id { get; set; }
public string Name { get; set; }
}
class Program
{
static void Main(string[] args)
{ //简单判断
var b = JavascriptUtil.Execute<int>("1>0", null);
//直接给参数赋值
string str = "var stu={};stu.Id=Id;stu.Name=Name; return stu.Id";
Dictionary<string, object> dict = new Dictionary<string, object>();
dict.Add("Id", "");
dict.Add("Name", "Aven");
var c = JavascriptUtil.Execute<string>(str, dict);
//通过类实例来赋值
Dictionary<string, object> dict2 = new Dictionary<string, object>();
var st = new Student//这里一定要使用public
{
Id = "",
Name = "Grace"
};
dict2.Add("ST",st);
var str2 = "var stu={};stu.Id=ST.Id;stu.Name=ST.Name; return stu.Id";
var d = JavascriptUtil.Execute<string>(str2, dict2);
}
public static string ReadFile(string path)
{
StreamReader sr = new StreamReader(path, Encoding.Default);
String line;
StringBuilder sb = new StringBuilder();
while ((line = sr.ReadLine()) != null)
{
sb.AppendLine(line);
}
return sb.ToString();
}
}
public static class JavascriptUtil
{
static JavascriptUtil()
{
}
public static object Execute<T>(string expression, Dictionary<string, object> args)
{
if (string.IsNullOrEmpty(expression))
{
if (typeof(T) == typeof(int) || typeof(T) == typeof(decimal) || typeof(T) == typeof(double) || typeof(T) == typeof(float))
{
return ;
}
if (typeof(T) == typeof(DateTime))
{
return DateTime.MinValue;
}
if (typeof(T) == typeof(string))
{
return "";
}
return default(T);
}
if(typeof(T)==typeof(int))
{
var result = JintExecute(expression, args);
return Convert.ToInt32(result);
}
if (typeof(T) == typeof(decimal ))
{
var result = JintExecute(expression, args);
return Convert.ToDecimal(result);
}
if (typeof(T) == typeof(double ))
{
var result = JintExecute(expression, args);
return Convert.ToDouble(result);
}
if (typeof(T) == typeof(DateTime ))
{
var result = JintExecute(expression, args);
return Convert.ToDateTime(result);
}
return JintExecute(expression, args);
}
public static object JintExecute(string expression, Dictionary<string, object> args)
{
var engine = _engine;
if (args != null)
{
foreach (var x in args)
{
engine.SetParameter(x.Key, x.Value);
}
}
return engine.Run(expression) ;
}
private static JintEngine _engine= new JintEngine();
}
}