如何将项目插入列表顺序？ [英] How to insert item into list in order?

问题描述

谁能教我如何在C＃中插入项目到列表顺序？

我的DateTimeOffset对象的名单，我想插入新成列表秩序。

 列表<&的DateTimeOffset GT; TimeList = ... 
 //确定顺序插入前或新增项目
  

对不起，需要更新我的问题。

 列表< customizedClass> ITEMLIST = ... 
 // customizedClass包含的DateTimeOffset对象等字符串，INT等
 
 ItemList.Sort（）; //这不会工作，直到与的DateTimeOffset 
 ItemList.OrderBy组数据比较（）; //这不会工作，直到与的DateTimeOffset 
  

组数据比较

谁能帮我把作为的DateTimeOffset .OrderBy（）的参数？

我也试过

  ITEMLIST =从s在ITEMLIST 
排序依据s.PublishDate降// .PublishDate是DateTime类型
选择s; 
  

但是，返回该错误消息，

< BLOCKQUOTE>

无法隐式转换类型'System.Linq.IOrderedEnumerable'到'System.Collections.Gerneric.List。显式转换存在（是否缺少强制转换？）

解决方案

修改您的LINQ，加了ToList（）结尾：

  ITEMLIST =（从s在ITEMLIST 
排序依据s.PublishDate降
。选择所需S）.ToList（）; 
  

另外排序列表分配给另一个变量

  VAR排序列表=从s中.... 
  

Could anyone please teach me how to insert item into list in order in C#?

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

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

Could anyone please help me putting DateTimeOffset as the parameter of .OrderBy()?

I also tried

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

However, it returns this error message,

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

解决方案

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

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

Alternatively assign the sorted list to another variable

var sortedList = from s in ....

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