现在有一个小需求就是一个xml中有一个condition节点，节点中包含有一个字符串类型的表达式，要对这个表达式进行运算，判断运算结果是true还是false。
如下：
<Condition Type="CONDITION">param1>3</Condition>
现需要运算condition中的表达式param1>3。表达式的语法符合javascript表达式语法。
解决的代码如下：
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using
System;using
System.Collections.Generic;using
System.Linq;using
System.Text;using
Microsoft.JScript;namespace
TestXpression{class
Program{/// <summary>/// 微软提供的运算符合js语法的表达式/// </summary>/// <param name="sExpression"></param>/// <returns></returns>public
static object EvalExpress(string
sExpression){Microsoft.JScript.Vsa.VsaEngine ve = Microsoft.JScript.Vsa.VsaEngine.CreateEngine();return
Microsoft.JScript.Eval.JScriptEvaluate(sExpression, ve);}/// <summary>/// 传入参数，将参数和参数值进行拼接/// </summary>/// <param name="name"></param>/// <param name="value"></param>/// <param name="type"></param>/// <returns></returns>public
static string trans(string
name, string
value,string
type){string
s = "";//"var a=10;var b=15;var c=‘hello‘"//string s = "var " + name + "=" + value.ToString() + ";";if (type == "stringType"){s = "var "
+ name + "="
+ "‘"
+ value.ToString() + "‘"
+ ";";}else
{s = "var "
+ name + "="
+ value.ToString() + ";";}return
s;}public
static string MakeCondition(){Dictionary<string, string> myParameters = new
Dictionary<string, string>();myParameters.Add("xingCan1", "15");myParameters.Add("xingCan2", "10");myParameters.Add("xingCan3","C");string
condition = "";string
type = "stringType";foreach
(var
ss in
myParameters){condition += trans(ss.Key.ToString(), ss.Value.ToString(), type);}string
expression1 = "xingCan1>xingCan2";string
expression2 = "xingCan3==‘C‘";// ------------参数赋值--------------------------- <<<<条件>>>>>//"var xingCan1=10;var xingCan2=15;var xingCan3=‘C‘;xingCan3==‘C‘"condition += expression1;return
condition;}static
void Main(string[] args){string
s = MakeCondition();object
flag = EvalExpress(s);System.Console.WriteLine(flag.ToString());System.Console.ReadLine();}}} |
原文：http://www.cnblogs.com/devinliang/p/3783861.html