看到許多人經常問到這個問題： 怎么由字符串 “126 + (256 - 2^4 )”，或者怎么判斷 “115 > 56 || 14<45”的結果等等，在MSDN上查了查，寫了一個Eval類

/*****************************************************************
** 文件名:       Eval.cs
** Copyright (c) 1999 -2003
** 創建人:       Phoenix
** 創建日期:
** 修改人:
** 修改日期:
** 描 述:         獲取字符串所表示的邏輯意義
** 版 本:1.0
******************************************************************/

using System.CodeDom;
using System.CodeDom.Compiler;
using Microsoft.CSharp;
using System.Reflection;

public class Eval
{
static object GetValue( string value )
 {
   string codeSnippet = "using System; " + "\r\n" +
                                   "namespace CzG {" + "\r\n" +
                                               " public class Eval" + "\r\n" +
                                               " {" + "\r\n" +
                                   "       public Eval(){} " + "\r\n" +
                                               "  public object GetValue()" + "\r\n" +
                                               "  {" + "\r\n" +
                                               "   return " + value + ";" + "\r\n" +
                                               "  }" + "\r\n" +
                                               " } }";