添加COM引用：
Microsoft Sctipt Control 1.0
private void button2_Click(object sender, EventArgs e)
{
MSScriptControl.ScriptControl sc = new MSScriptControl.ScriptControlClass();
sc.Language = "JavaScript";
MessageBox.Show(sc.Eval("((2*3)-5+(3*4))+6/2").ToString());//1+12+3
}
运行结果：16