EF，ADO.NET Entity Data Model简要的笔记

1. 新建一个项目，添加一个ADO.NET Entity Data Model的文件，此文件会生成所有的数据对象模型，如果是用vs2012生的话，在.Designer.cs里会出现“// Default code generation is disabled for model 'C:\Work\Project\20140303\Delete\Model1.edmx'.
// To enable default code generation, change the value of the 'Code Generation Strategy' designer
// property to an alternate value. This property is available in the Properties Window when the model is
// open in the designer.”，而且会生成一些类文件。这时可以这样做，删除edmx模型下所有.tt和.diagram文件(如果不删直接执行下一步的话会报错提示)，打开.edmx设计器，空白地方右键属性，将Code Genaration的属性值 从 None改为Default，就OK了。

2. 新建IRepository文件

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;



using System.Configuration.Provider;

using System.Linq.Expressions;

using System.Data.Common;

using System.Reflection;



namespace Entity

{

    public interface IRepository<T>

    {



        void Add(T entity);



        void Update(int ID, T entity);



        void Delete(int ID);



        IQueryable<T> FindAll();



        T GetSingle(int ID);



        int Save();

    }



    public class Repository<T> : IRepository<T> where T : class

    {

        protected EntityContext Context { get; set; }



        /// <summary>

        /// 

        /// </summary>

        protected string EntityName { get { return typeof(T).Name; } }



        /// <summary>

        /// ObjectQuery的名称

        /// </summary>

        protected string EntitySetName { get; set; }



        /// <summary>

        /// 连接字符

        /// </summary>

        protected string ConnectionString { get { return System.Configuration.ConfigurationManager.ConnectionStrings["EntityContext"].ConnectionString; } }



        public Repository()

        {

            Context = new EntityContext();

        }



        public Repository(EntityContext context)

        {

            Context = context;

        }



        public virtual void Delete(int ID)

        {

            T entity = GetSingle(ID);

            Context.DeleteObject(entity);

        }



        public virtual T GetSingle(int ID)

        {

            var itemParameter = Expression.Parameter(typeof(T), "item");



            var whereExpression = Expression.Lambda<Func<T, bool>>

                (

                Expression.Equal(

                    Expression.Property(

                        itemParameter,

                        "ID" //默认为ID,如果不是ID,需要获取每个实体的PrimaryKey的字段名称

                        ),

                    Expression.Constant(ID)

                    ),

                new[] { itemParameter }

                );



            return FindAll().FirstOrDefault(whereExpression);

        }









        public virtual T GetSingle64(Int64 ID)

        {

            var itemParameter = Expression.Parameter(typeof(T), "item");



            var whereExpression = Expression.Lambda<Func<T, bool>>

                (

                Expression.Equal(

                    Expression.Property(

                        itemParameter,

                        "ID" //默认为ID,如果不是ID,需要获取每个实体的PrimaryKey的字段名称

                        ),

                    Expression.Constant(ID)

                    ),

                new[] { itemParameter }

                );

            return FindAll().First(whereExpression);

        }



        public virtual void Add(T entity)

        {

            Context.AddObject(EntitySetName, entity);

        }



        public virtual void Update(int ID, T entity)

        {

            T oringal = GetSingle(ID);



            oringal = entity;

            Context.ApplyPropertyChanges(EntitySetName, oringal);

        }



        public virtual IQueryable<T> FindAll()

        {

            return Context.CreateQuery<T>("[" + EntitySetName + "]");

        }



        public virtual int Save()

        {

            return Context.SaveChanges();

        }



        /// <summary>

        /// 执行存储过程 

        /// </summary>

        /// <param name="CommandText"></param>

        /// <param name="param"></param>

        protected virtual int ExecuteStoredProcedure(string CommandText, params System.Data.Common.DbParameter[] param)

        {

            DbCommand cmd = new System.Data.SqlClient.SqlCommand();

            using (DbConnection conn = new System.Data.SqlClient.SqlConnection(ConnectionString))

            {

                cmd.Connection = conn;

                cmd.CommandText = CommandText;

                cmd.CommandType = System.Data.CommandType.StoredProcedure;

                if (param != null)

                    cmd.Parameters.AddRange(param);

                conn.Open();

                int result = 0;

                try

                {

                    result = cmd.ExecuteNonQuery();

                }

                catch (Exception ex)

                {

                    throw new Exception("执行存储过程出错," + ex.Message);

                }

                finally

                {

                    conn.Close();

                }

                return result;

            }

        }



        /// <summary>

        /// 执行存储过程返回泛型实体数据集

        /// </summary>

        /// <typeparam name="TEntity"></typeparam>

        /// <param name="CommandText"></param>

        /// <param name="param"></param>

        /// <returns></returns>

        protected virtual List<TEntity> ExecuteCommand<TEntity>(string CommandText, params System.Data.Common.DbParameter[] param)

        {

            List<TEntity> list = new List<TEntity>();



            DbCommand cmd = new System.Data.SqlClient.SqlCommand();



            using (DbConnection conn = new System.Data.SqlClient.SqlConnection(ConnectionString))

            {

                cmd.Connection = conn;

                cmd.CommandText = CommandText;

                cmd.CommandType = System.Data.CommandType.StoredProcedure;

                if (param != null)

                    cmd.Parameters.AddRange(param);

                conn.Open();



                try

                {

                    using (DbDataReader reader = cmd.ExecuteReader())

                    {

                        while (reader.Read())

                        {

                            //创建实例

                            TEntity RowInstance = Activator.CreateInstance<TEntity>();

                            //反射获取实例的属性

                            foreach (PropertyInfo Property in typeof(TEntity).GetProperties())

                            {

                                try

                                {

                                    //根据实例名称获取数据

                                    if (reader[Property.Name] != DBNull.Value)

                                    {

                                        //将DataReader读取出来的数据填充到对象实体的属性里

                                        Property.SetValue(RowInstance, Convert.ChangeType(reader[Property.Name], Property.PropertyType), null);

                                    }

                                }

                                catch

                                {

                                    break;

                                }

                            }

                            //将数据实体对象add到泛型集合中

                            list.Add(RowInstance);



                        }

                    }

                }

                catch (Exception ex)

                {

                    throw new Exception("返回泛型实体出错，" + ex.Message);

                }

                finally

                {

                    conn.Close();

                }

            }

            return list;

        }

    }

}

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3. 新建类的处理文件，例如为”aspnet_Roles“新建一个处理类。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;



namespace Entity

{

    public interface Iaspnet_RolesRepository : IRepository<aspnet_Roles>

    {

        List<aspnet_Roles> GetList();

    }



    public class aspnet_RolesRepository : Repository<aspnet_Roles>, Iaspnet_RolesRepository

    {

        public aspnet_RolesRepository()

        {

            EntitySetName = "aspnet_Roles";

        }



        public List<aspnet_Roles> GetList()

        {

            return FindAll().ToList();

        }

    }

}

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4. view层的操作。

在Global.asax里添加如下代码，这里用到了依赖注入。

        static IUnityContainer _Container;



        public static IUnityContainer Container

        {

            get

            {

                if (_Container == null)

                {

                    _Container = new UnityContainer();

                    UnityConfigurationSection section = (UnityConfigurationSection)System.Configuration.ConfigurationManager.GetSection("unity");

                    section.Configure(_Container, "TEST");

                }

                return _Container; ;

            }

        }

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并在webconfig里添加配置节点：

<?xml version="1.0" encoding="utf-8"?>

<!--

  For more information on how to configure your ASP.NET application, please visit

  http://go.microsoft.com/fwlink/?LinkId=169433

  -->

<configuration>

  <configSections>

    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />

  </configSections>

  <unity>

    <containers>

      <container name="TEST">

        <types>

          <type name="aspnet_Roles" type="Entity.Iaspnet_RolesRepository, Entity" mapTo="Entity.aspnet_RolesRepository,Entity" />

        </types>

      </container>

    </containers>

  </unity>

  <appSettings>

    <add key="webpages:Version" value="2.0.0.0" />

    <add key="webpages:Enabled" value="false" />

    <add key="PreserveLoginUrl" value="true" />

    <add key="ClientValidationEnabled" value="true" />

    <add key="UnobtrusiveJavaScriptEnabled" value="true" />

  </appSettings>

  <connectionStrings>

    <add name="MyDomainContext" connectionString="Data Source=WINSERVER08XU\SQLXU;user id=sa;password=101;Initial Catalog=XU" providerName="System.Data.SqlClient"/>

    <add name="EntityContext" connectionString="metadata=res://*/Entitycontext.csdl|res://*/Entitycontext.ssdl|res://*/Entitycontext.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=.\sqlxu;initial catalog=TestMembership;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />

  </connectionStrings>

  <system.web>

    <httpRuntime targetFramework="4.5" />

    <compilation debug="true" targetFramework="4.5" />

    <pages>

      <namespaces>

        <add namespace="System.Web.Helpers" />

        <add namespace="System.Web.Mvc" />

        <add namespace="System.Web.Mvc.Ajax" />

        <add namespace="System.Web.Mvc.Html" />

        <add namespace="System.Web.Routing" />

        <add namespace="System.Web.WebPages" />

      </namespaces>

    </pages>

  </system.web>

  <system.webServer>

    <validation validateIntegratedModeConfiguration="false" />

    <handlers>

      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />

      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />

      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />

      <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />

      <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />

      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

    </handlers>

  </system.webServer>

</configuration>

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这里新插入的是：

<configSections>

    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />

  </configSections>

  <unity>

    <containers>

      <container name="TEST">

        <types>

          <type name="aspnet_Roles" type="Entity.Iaspnet_RolesRepository, Entity" mapTo="Entity.aspnet_RolesRepository,Entity" />

        </types>

      </container>

    </containers>

  </unity>

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注意低配置，<configSections>紧跟在<configuration>后面，否则会出错。

5. 在Controller里调用。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Web.Routing;

using Microsoft.Practices.Unity;



using Entity;

namespace _20140303.Controllers

{

    public class HomeController : Controller

    {

        Iaspnet_RolesRepository aspnet_RolesRepository;

        public ActionResult Default()

        {

            aspnet_RolesRepository = MvcApplication.Container.Resolve<Iaspnet_RolesRepository>("aspnet_Roles");

            List<aspnet_Roles> vaspnet_RolesList = aspnet_RolesRepository.GetList();

            return View();

        }

        



    }

}

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