ASP.net页面在import语句中获取错误,但我有参考的地方吗？

任何想法为什么我得到下面的错误在我的MVC2项目，即使通过在项目本身我绝对有一个引用“system.Web.Entity”？

Compiler Error Message: CS0234: The type or namespace name 'Entity' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)

Source Error:

Line 1:  <%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<List<Node>>" %>
Line 2:  <%@ Import Namespace="TopologyDAL" %>
Line 3:  <%@ Import Namespace="System.Data.Entity" %>

谢谢

编辑 – 顺便说一句，如果我拿出第3行，那么我得到的错误：

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0012: The type 'System.Data.Objects.DataClasses.EntityObject' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Entity,Version=4.0.0.0,Culture=neutral,PublicKeyToken=b77a5c561934e089'.

Source Error:

Line 164:    
Line 165:    [System.Runtime.CompilerServices.CompilerGlobalScopeAttribute()]
Line 166:    public class views_node_index_aspx : System.Web.Mvc.ViewPage<List<Node>>,System.Web.SessionState.IRequiresSessionState,System.Web.IHttpHandler {
Line 167:        
Line 168:        private static bool @__initialized;


Source File: c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\6ec16fd2\a2147d7c\App_Web_index.aspx.1b64bdf1.ajruf7pv.0.cs    Line: 166

解决方法

如 miensol建议，尝试把它放在你的Web.config文件中：

<compilation debug="true" targetFramework="4.0">
  <assemblies>
    <add assembly="System.Data.Entity,PublicKeyToken=b77a5c561934e089" />
  </assemblies>
</compilation>