实体类型List`1不是当前上下文模型的一部分 [英] The entity type List`1 is not part of the model for the current context

问题描述

我一直在使用数据库首先，​​EF 4.1

I've been using Database First, EF 4.1

我得到的实体类型List`1是不是该机型为当前上下文的一部分。尝试更新从我的编辑，查看记录时出错。

I am getting "The entity type List`1 is not part of the model for the current context." error when trying to update a record from my Edit View.

该错误是在

db.Entry(properties).State = EntityState.Modified;

下面是我的模型：

public class Users
     {
     [Key]
     public int User_ID { get; set; }
     public string UserName { get; set; }

     [NotMapped]
     public IEnumerable<App_Properties> User_Properties
     {
          get { return Properties.Where(u => u.User_ID == User_ID); }
     }

     public virtual ICollection<App_Properties> Properties { get; set; }
}

public class App_Properties
{
     [Key]
     public int Prop_ID { get; set; }
     public int User_ID { get; set; }
     public int App_ID { get; set; }
     public string Key { get; set; }
     public string Value { get; set; }
     public DateTime DateEntered { get; set; }
     public DateTime DateModified { get; set; }

     [ForeignKey("User_ID")]
     public virtual Users Users { get; set; }
}

下面是我的控制器：

[HttpPost]
public ActionResult Edit(ICollection<App_Properties> properties)
{
     if (ModelState.IsValid)
     {
          foreach (var item in properties)
          {
               db.Entry(properties).State = EntityState.Modified;
          }

          db.SaveChanges();

          return RedirectToAction("Index");
     }

     return View(properties);
}

我怀疑foreach循环是不是在设置为EntityState在ICollection的每个项目为宜。

I suspect the foreach loop is not appropriate in setting the EntityState for each item in an ICollection.

任何援助将大大AP preciated。

Any assistance would be greatly appreciated.

推荐答案

试着改变你的循环：

foreach (var item in properties)
{
     db.Entry(item).State = EntityState.Modified;
}

您分别致电 db.Entry（属性），所以你试图同时附上整个集合。 DbContext.Entry（对象）需要一个单一的对象，不集合。

You were calling db.Entry(properties), so you were trying to attach the whole collection at once. DbContext.Entry(object) expects a single object, not a collection.

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