将DBContext转换为ObjectContext以供GridView使用 [英] Convert DBContext to ObjectContext for use with GridView

问题描述

我有一个webforms项目使用EF codefirst来保存数据。
我想使用GridView和EntityDataSource，以保存写入CRUD。
这是可能的吗？

我可以将DBContext转换为EntityDataSource预期的ObjectContext吗？

这是我尝试的：

 < asp：EntityDataSource ID =OrdersDataSourcerunat =serverContextTypeName = EntityTypeFilter =OrderEnableDelete =False
 EnableUpdate =FalseInclude =OrderLinesOrderBy =it.Id > 
< / asp：EntityDataSource> 
 
< asp：GridView ID =OrdersGridViewrunat =serverAllowPaging =TrueAllowSorting =True
 AutoGenerateColumns =TrueDataKeyNames =IdDataSourceID = OrdersDataSource/> 
  

但是我收到这个例外：

无法将类型为SomeNamespace.Models.ShopDBContext的对象转换为键入System.Data.Objects.ObjectContext。

解决方案

尝试这样：

  var context = new YourDbContext（）; 
 var adapter =（IObjectContextAdapter）上下文; 
 var objectContext = adapter.ObjectContext; 
  

I have a webforms project using EF codefirst to persist data. I'd like to use a GridView and EntityDataSource, in order to save writing CRUD. Is this possible?

Can I convert my DBContext to an ObjectContext that is expected by the EntityDataSource?

Here's what I tried:

<asp:EntityDataSource ID="OrdersDataSource" runat="server" ContextTypeName="SomeNamespace.Models.ShopDBContext" 
     EnableFlattening="False" EntitySetName="Orders" EntityTypeFilter="Order" EnableDelete="False" 
     EnableUpdate="False" Include="OrderLines" OrderBy="it.Id"> 
</asp:EntityDataSource>

<asp:GridView ID="OrdersGridView" runat="server" AllowPaging="True" AllowSorting="True" 
     AutoGenerateColumns="True" DataKeyNames="Id" DataSourceID="OrdersDataSource" /> 

However I get this exception:

Unable to cast object of type 'SomeNamespace.Models.ShopDBContext' to type 'System.Data.Objects.ObjectContext'.

解决方案

Try this:

var context = new YourDbContext();
var adapter = (IObjectContextAdapter)context;
var objectContext = adapter.ObjectContext;

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