实体框架跟踪集合可以绑定到ASP.Net Gridview？ [英] Can a Entity Framework Trackable collection be bound to an ASP.Net Gridview?

问题描述

我在ASP.Net页面上有一个GridView。我想将Gridview的DataSource设置为可追踪的Entity Framework对象集合。我虽然代码应该如下所示：

  this.gvMyGridView.DataSource = entity.MyDetailedItems; 
 this.gvMyGridView.DataBind（）; 
  

但这并不显示任何数据。

我正在使用自我跟踪实体，MyDetailedItems是另一个表中的行的导航属性。

解决方案

自我跟踪实体不支持延迟加载因此，如果要使用它们，则必须显式加载导航属性。使用：

  //加载具有相关实体的实体
 var entity = context.Entities.Include（MyDetailedItems ）。单（...）; 
  

或

  //为已加载实体加载相关实体
 context.LoadProperty（entity，MyDetailedItems）; 
  

I've got a GridView on a ASP.Net page. I would like to set the DataSource of the Gridview to a trackable collection of Entity Framework objects. I though the code should look like this:

        this.gvMyGridView.DataSource = entity.MyDetailedItems;
        this.gvMyGridView.DataBind();

But this doesn't display any data.

I am using self tracking entities and the MyDetailedItems is a navigation property to rows from another table.

解决方案

EF 4 with self tracking entities does not support lazy loading so you must explicitly load navigation properties if you want to use them. Use either:

// loading entity with related entities
var entity = context.Entities.Include("MyDetailedItems").Single(...);

or

// loading related entities for already loaded entity
context.LoadProperty(entity, "MyDetailedItems");

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