//计算表达式，错误返回null
/// <summary>
/// 计算表达式，错误返回null
/// </summary>
/// <param name="expression">表达式</param>
/// <param name="argument">参数</param>
/// <param name="num">参数值</param>
/// <returns></returns>
public static string Eval(string expression, string argument, string num)
{
MSScriptControl.ScriptControl script = new MSScriptControl.ScriptControlClass();
script.Language = "JavaScript";
try
{
// return (new SimpleExpressionEvaluator.ExpressionEvaluator().Evaluate(ReplaceExpressionWithArguement(expression, argument, num))).ToString();
return(script.Eval(ReplaceExpressionWithArguement(expression, argument, num)).ToString());
}
catch (Exception)
{
return(null);
}
}
public static void Main(string[] args)
{
//string f1 = "";
//A:基本工资
//B:绩效系数
MSScriptControl.ScriptControl sc = new MSScriptControl.ScriptControlClass();
sc.Language = "JavaScript";
string formulate2 = string.Format("if({0}==1)({2});else if({0}==2)({3});else if({0}==3)({4})", 3, 2, 3, 4, 5);
//string formulate1 = string.Format("if({0}==2)((({0}*{1})-{3}+({1}*{2}))+{4}/{0});else(1+2*3)", 2, 3, 4, 5, 6);
object objResult = sc.Eval(formulate2);
if (objResult != null)
{
Console.WriteLine(objResult);
}
Console.ReadKey();
}