任何想法为什么我在我的 MVC2 项目中收到以下错误，即使在项目本身中我肯定有对“system.Web.Entity”的引用？
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" %>
thanks
编辑 - 顺便说一句，如果我取出第 3 行，则会收到错误：
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
As miensol https://stackoverflow.com/users/155213/miensol建议，尝试将其放入您的Web.config file:
<compilation debug="true" targetFramework="4.0">
<assemblies>
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
</assemblies>
</compilation>
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