EF代码第一列表< DateTime>不创建表 [英] EF code first List<DateTime> not creating table

问题描述

  public class Activity 
 {
 public Guid Id {get;组; } 
 public string描述{get;组; } 
 public List< DateTime> DateDone {get;组; } 
< snip> 
 
 public Activity（）
 {
 if（DateDone == null）
 DateDone = new List< DateTime>（）; 
} 
} 
  

我重建项目，然后运行MVC3应用程序数据库生成（确认，我添加和删除列），我的数据被种子（当我修改种子的数据时，它在屏幕上更改）

我能够：

  var activity = db.Activities.Find（id）; 
 activity.DateDone = DateTime.Now; 
 db.SaveChanges（）; 
  

但数据未保存。我已经检查了数据库，因为只有一个表（活动），它有所有适当的字段。我希望它应该有一个第二个表，但ActivityDateDone有两个字段，ActivityGuid& DateDone。

在这项工作中我缺少什么？

解决方案

实体框架不支持原始类型的集合。

您需要定义一个单独的类来保存DateTimes。

I am creating a very simple EF4 code first project with one entity.

public class Activity
{
    public Guid Id { get; set; }
    public string Description { get; set; }
    public List<DateTime> DateDone { get; set; }
    <snip>

    public Activity()
    {
        if(DateDone==null)
            DateDone = new List<DateTime>();
    }
}

I rebuild my project and then run the MVC3 app and the database generates (confirmed, I have added and removed columns), my data is seeded (it changes on screen when I modify the seeded data)

I am able to:

var activity = db.Activities.Find(id);
activity.DateDone = DateTime.Now;
db.SaveChanges();

But the data isn't saved. I have checked the database as there is only the one table (Activity) and it has all the appropriate fields. I expect it should have a second table though, ActivityDateDone with two fields, ActivityGuid & DateDone.

What am I missing on making this work?

解决方案

Entity Framework does not support collections of primitive types.

You need to define a separate class to hold the DateTimes.

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