使用 Include 时出现 ObjectContext Closed 错误？
我正在尝试为实体框架创建一个通用的 Get 方法，其中包含动态 Where 和 Include。我正在使用下面的代码，但是当我尝试访问包含列表中的导航属性时，我收到有关对象上下文被关闭的错误
不是 .Include() 应该加载这些对象，这样我就不需要保持 ObjectContext 打开？
public static List<T> GetList<T>(Func<T, bool> where, string[] includes)
where T : EntityObject
{
using (var context = new TContext())
{
ObjectQuery<T> q = context.CreateObjectSet<T>();
foreach (string navProperty in includes)
{
q.Include(navProperty);
}
return q.Where<T>(where).ToList();
}
}
导致错误的代码：
var x = DAL<MyContext>.GetList<MyEntity>(
p => p.Id == 1
, new string[]{ "Type" } );
var y = x.Type; // Throws an error that context has been closed
我觉得我一定犯了某种愚蠢的错误，因为我是 EF 的新手，并且仍在尝试解决它。
I am trying to create a generic Get method for Entity Framework, with a dynamic Where and Include. I am using the code below, however when I try to access a Navigation Property that was in the Include list, I am getting an error about the Object Context being closed
Isn't .Include() supposed to load those objects so I don't need to keep the ObjectContext open?
public static List<T> GetList<T>(Func<T, bool> where, string[] includes)
where T : EntityObject
{
using (var context = new TContext())
{
ObjectQuery<T> q = context.CreateObjectSet<T>();
foreach (string navProperty in includes)
{
q.Include(navProperty);
}
return q.Where<T>(where).ToList();
}
}
Code causing error:
var x = DAL<MyContext>.GetList<MyEntity>(
p => p.Id == 1
, new string[]{ "Type" } );
var y = x.Type; // Throws an error that context has been closed
I feel I must be making some kind of stupid mistake here because I'm new to EF and am still trying to figure it out.
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您没有重新分配
q- 这应该可以解决这个问题：请记住，您使用的扩展方法每个都返回一个 new
IQueryable，不修改原来的。You are not re-assigning
q- this should fix it:Remember you are using extension methods that each return a new
IQueryable<T>, not modifying the original.