[csharp] view plain copy print?

//方法一 利用DataTable中的Compute方法 例如：1*2-(4/1)+2*4=6

string formulate = string.Format("{0}*{1} - {2}/{3} +{1}*{2}", , , , );

DataTable dt = new DataTable();

Response.Write(dt.Compute(formulate, "").ToString());  

Response.Write("<br/>");  

//方法二  利用JS中强大的Eval函数 可以带if-else判断 添加COM引用：Microsoft Sctipt Control 1.0

MSScriptControl.ScriptControl sc = new MSScriptControl.ScriptControlClass();

sc.Language = "JavaScript";

string formulate1 = string.Format("if({0}==2)((({0}*{1})-{3}+({1}*{2}))+{4}/{0});else(1+2*3)", , , , ,);

object objResult = sc.Eval(formulate1);

if (objResult != null)

{

    Response.Write(objResult.ToString());//1+12+3

}  

[csharp] view plain copy print?

/* 方法三 需将Microsoft.JScript 和Microsoft.Vsa加入参考并引用Microsoft.JScript */

public object EvalExpress(string sExpression)

 {

            Microsoft.JScript.Vsa.VsaEngine ve = Microsoft.JScript.Vsa.VsaEngine.CreateEngine();

            return Microsoft.JScript.Eval.JScriptEvaluate(sExpression, ve);

}