return sb.ToString();

         }

         /// <summary>

         /// 表达式类型

         /// =,like等

         /// </summary>

         /// <returns>string</returns>

         protected abstract string GetCompareType();

     }

     /// <summary>

     /// 等于表达式

     /// </summary>

     [Serializable]

     public class EqExpression:BaseExpression

     {

         /// <summary>

         /// 构造等于表达式对象

         /// </summary>

         public EqExpression()

         {

         }

         /// <summary>

         /// 构造指定名称和值的等于表达式对象

         /// </summary>

         /// <param name="name">名称</param>

         /// <param name="value">值</param>

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