/// <summary>
 /// 操作符匹配(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>
 /// <param name="matchOperator">匹配操作符</param>
 /// <returns></returns>
 public virtual IWhereExpression Match(WhereOperators @operator, string field, string value, MatchOpertaors matchOperator = MatchOpertaors.Equals)
 {
     if (!string.IsNullOrEmpty(field))
     {
         return(WhereIf(_dialect.PreName(field) + _dialect.MatchOperatorGrammar(EnumExtensions.GetProperty(matchOperator, "Keyword")) + "{0}", value, @operator));
     }
     return(this);
 }