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C#中使用OrderBy和ThenBy等方法对List集合进行排序
阅读量:507 次
发布时间:2019-03-07

本文共 695 字,大约阅读时间需要 2 分钟。

  在C#的List操作中,针对List对象集合的排序我们可以使用OrderBy、OrderByDescending、ThenBy、ThenByDescending等方法按照特定的对象属性进行排序,其中Orderby表示按指定的第一个属性升序排序,OrderByDescending表示按指定的第一个属性降序排序,如果排序需要使用到不止一个条件的时候,可先使用OrderBy或者OrderByDescending方法排序完成后,再在方法链中调用ThenBy或者ThenByDescending对第二个条件排序,ThenBy会进行升序排序,ThenByDescending则是进行降序排序。

例如一个订单的Order类的定义如下:

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public class Order

 {

       public string DepCode { setget; }

 

       public string DepName { setget; }

 

       public decimal Amount { setget; }

}

针对订单类的List集合orderList对象进行排序,排序规则为:先按科室编码DepCode升序排序,而后根据订单金额Amount进行降序排序。则相应的语句如下:

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orderList = orderList.OrderBy(t => t.DepCode).ThenByDescending(t => t.Amount).ToList();

上述语句中t => t.DepCode的形式是Lambda表达式的写法,t代表orderList集合中的Order对象实体。

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