Not find request .Net FrameWork Data Provider, may be not installed

   在学习MVC3.0遇到这样的问题, 在英文版本上会提示这样的错误: not find request .Net Framework Data Provider, maybe not installed. 中文版本的提示: 找不到请求的.Net FrameWork Data Provider, 可能没有安装.

   重现这个问题的步骤:

    1. 添加Model类

• 在Solution Explorer,右击Model文件夹, 并选择Add -> Class
• 在Movie类中添加以下5个属性 并且添加MovieDBContext 类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;

namespace MvcMovie.Models
{
    public class Movie
    {
        public int ID { get; set; }
        public string Title { get; set; }
        public DateTime ReleaseDate { get; set; }
        public string Genre { get; set; }
        public decimal Price { get; set; }
    }

    public class MovieDBContext : DbContext
    {
        public DbSet<Movie> Movies { get; set; }
    }
}

• 配置Config,并且添加以下string到connectionStrings元素里

 <add name ="MovieDBContext" connectionString ="Data Source=|DataDirectory|Movies.sdf" providerName ="System.Data.SqlServerCe.4.0"/>

    2. 右击Controllers 文件夹 并且创建一个新的MoviesController.cs, 选择以下选项:

• Controller name: MoviesController
• Template: Controller with read/write actions and views, using Entity Framework.
• Model class: Movie(MvcMovie.Models)
• Data context class: MovieDBContext(MvcMovie.Models)

    解决方法:

• 安装SQL Server Compact 4.0(runtime + tools support)   
• http://www.microsoft.com/downloads/zh-cn/details.aspx?familyid=033cfb76-5382-44fb-bc7e-b3c8174832e2&displaylang=zh-cn   
• 如果安装后还不可以:

          打开C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config,复制DbProviderFactories节点下的内容替换C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Config\machine.config中的相应位置.

  

<DbProviderFactories> < add name="Odbc Data Provider" invariant="System.Data.Odbc" description=".Net Framework Data Provider for Odbc" type="System.Data.Odbc.OdbcFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> < add name="OleDb Data Provider" invariant="System.Data.OleDb" description=".Net Framework Data Provider for OleDb" type="System.Data.OleDb.OleDbFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> < add name="OracleClient Data Provider" invariant="System.Data.OracleClient" description=".Net Framework Data Provider for Oracle" type="System.Data.OracleClient.OracleClientFactory, System.Data.OracleClient, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <add name="SqlClient Data Provider" invariant="System.Data.SqlClient" description=".Net Framework Data Provider for SqlServer" type="System.Data.SqlClient.SqlClientFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> < /DbProviderFactories>