/// <summary>
 /// 模糊匹配(like %value%,自动忽略空或空文本)。
 /// </summary>
 /// <param name="operator">逻辑操作符。</param>
 /// <param name="field">列,例:aa</param>
 /// <param name="value">文本内容</param>
 /// <returns></returns>
 public virtual IWhereExpression Like(WhereOperators @operator, string field, string value)
 {
     if (!string.IsNullOrEmpty(field))
     {
         return(WhereIf(_dialect.LikeGrammar(field, true, true, false), value, @operator, p => _dialect.LikeValueFilter(p, true, true, false)));
     }
     return(this);
 }