如何按顺序将项目插入列表?

How to insert item into list in order?(如何按顺序将项目插入列表?)

问题描述

我有一个 DateTimeOffset 对象列表，我想将新对象按顺序插入到列表中.

I have a List of DateTimeOffset objects, and I want to insert new ones into the list in order.

List<DateTimeOffset> TimeList = ...
// determine the order before insert or add the new item

抱歉，需要更新我的问题.

Sorry, need to update my question.

List<customizedClass> ItemList = ...
//customizedClass contains DateTimeOffset object and other strings, int, etc.

ItemList.Sort();    // this won't work until set data comparison with DateTimeOffset
ItemList.OrderBy(); // this won't work until set data comparison with DateTimeOffset

另外，如何将DateTimeOffset作为.OrderBy()的参数?

Also, how to put DateTimeOffset as the parameter of .OrderBy()?

我也试过了:

ItemList = from s in ItemList
           orderby s.PublishDate descending    // .PublishDate is type DateTime
           select s;

但是，它会返回此错误消息，

However, it returns this error message,

无法将类型System.Linq.IOrderedEnumerable"隐式转换为System.Collections.Gerneric.List".存在显式转换(您是否缺少演员表?)

Cannot implicitly convert type 'System.Linq.IOrderedEnumerable' to 'System.Collections.Gerneric.List'. An explicit conversion exist (are you missing a cast?)

推荐答案

修改你的LINQ，在末尾添加ToList():

Modify your LINQ, add ToList() at the end:

ItemList = (from s in ItemList
            orderby s.PublishDate descending   
            select s).ToList();

或者将排序后的列表分配给另一个变量

Alternatively assign the sorted list to another variable

var sortedList = from s in ....

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