問題描述

我有一個 DateTimeOffset 對象列表，我想將新對象按順序插入到列表中.

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，需要更新我的問題.

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，如何將DateTimeOffset作為.OrderBy()的參數(shù)?

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

我也試過了:

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

但是，它會返回此錯誤消息，

However, it returns this error message,

無法將類型System.Linq.IOrderedEnumerable"隱式轉(zhuǎn)換為System.Collections.Gerneric.List".存在顯式轉(zhuǎn)換(您是否缺少演員表?)

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

推薦答案

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();

或者將排序后的列表分配給另一個變量

Alternatively assign the sorted list to another variable

var sortedList = from s in ....

這篇關于如何按順序?qū)㈨椖坎迦肓斜?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！