通过动态编译获取字符串表达的值

/*****************************************************************
** 文件名:       Eval.cs
** Copyright (c) 1999 -2003
** 创建人:       Phoenix
** 创建日期:
** 修改人:
** 修改日期:
** 描 述:         获取字符串所表示的逻辑意义
** 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; " + "rn" +
                                   "namespace CzG {" + "rn" +
                                               " public class Eval" + "rn" +
                                               " {" + "rn" +
                                   "       public Eval(){} " + "rn" +
                                               "  public object GetValue()" + "rn" +
                                               "  {" + "rn" +
                                               "   return " + value + ";" + "rn" +
                                               "  }" + "rn" +
                                               " } }";