对象集合与LINQ的更新酒店 [英] Update property in object collection with linq

问题描述

有如下

 公共类计划
 {
与对象结构对象的列表公众诠释ID {搞定;组; } 
公共字符串名称{;组; } 
 
公共时间表（）{} 
} 
  

执行数据LINQ查询，我可以看到的物体的正确填充列表

  VAR进度=（从数据
 D选择新计划
 {
 ID = d.id，
 NAME =
}）了ToList（）。 
  

在后面的代码我想改变属性名称取决于一个条件。举几个例子，我发现

  schedule.ForEach（S = GT; {s.Name =条件名称;}）; 
 schedule.Select（S = GT; {s.Name =条件名称;返回小号;}）; 
  

在执行休假名称参数空当我在监视窗口刷新时间表。
任何人都可以看看有什么不对的？

通过收集循环，并试图改变属性没有改变，要么

 的foreach（附表VAR SCH）
 {
 sch.Name =新名; 
} 
  

schedule.ToList（）[0] .Name点==

更新

.ToList（）调用是非常重要的，使代码工作。

  VAR进度=（从数据
 D选择新的时间表
 {
 n = d.id，
名称=
}）了ToList（）; 
  

解决方案

代码工作 - 执行schedule.ForEach后（） Name属性将被更新。也许有一些东西，你已经离开了。

Have a list of objects with the object structure as following

public class Schedule
{
    public int ID { get; set; }
    public string Name { get; set; }

    public Schedule() {}
}

Executing a linq query on data I can see properly populated list of objects

var schedule = (from d in data 
                select new Schedule
                {
                    ID = d.id,
                    Name = "" 
                }).ToList();

later in code I want to change property Name depends on a condition. A few examples I found

schedule.ForEach(s => { s.Name = "Condition Name"; });
schedule.Select(s => { s.Name = "Condition name"; return s; });

after execution leave Name parameter "null" when I refresh schedule in the watch window. Can anyone see what's wrong with this?

Looping through collection and trying to change Property doesn't change it either

   foreach (var sch in schedule)
   {
       sch.Name = "New name";
   }

schedule.ToList()[0].Name == ""

UPDATE

.ToList() call in the snippet below is very important and makes code working.

var schedule = (from d in data 
                select new Schedule
                {
                    ID = d.id,
                    Name = "" 
                }).ToList();

解决方案

The code works - after executing schedule.ForEach() the Name property is updated. Maybe there is something that you've left out.

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