/// <summary>
/// 创建一个排序表达式实例
/// </summary>
/// <param name="fieldName"></param>
/// <param name="direction"></param>
/// <returns></returns>
public static OrderExpression CreateInstance(string fieldName, string direction)
{
OrderExpression order = null;
switch (direction)
{
case "降序":
case "降":
case "DESC":
case "Desc":
case "desc":
case "D":
case "d":
order = OrderExpression.Desc(fieldName);
break;
default:
order = OrderExpression.Asc(fieldName);
break;
}
return(order);
}
/// <summary>
/// 添加排序表达式
/// </summary>
/// <param name="exp"></param>
/// <returns></returns>
public QueryParameter AddOrderExpr(OrderExpression exp)
{
this._orderExpressions.Add(exp);
return(this);
}