MVC项目结构搭建及单个类的实现学习笔记1

UserDal继承BaseDal

using PMS.IDAL;
using PMS.Model;

namespace PMS.DAL
{
  public partial class UserDal : BaseDal<User>
  {
    
  }
}

数据访问接口层的构建

然后我们建立相应的IbaseDal接口和IUserDal接口，并且使UserDal类实现IUserDal接口

IBaseDal：

using System;
using System.Linq;

namespace PMS.IDAL
{
  public interface IBaseDal<T> where T:class,new()
  {
    IQueryable<T> LoadEntities(System.Linq.Expressions.Expression<Func<T, bool>> whereLamada);

    IQueryable<T> LoadPageEntities<s>(int pageIndex, int pageSize, out int totalCount,
      System.Linq.Expressions.Expression<Func<T, bool>> whereLambda,
      System.Linq.Expressions.Expression<Func<T, s>> orderbyLambda, bool isAsc);

    bool DeleteEntity(T entity);
    
    bool EditEntity(T entity);

    T AddEntity(T entity);
  }
}

IUserDal：

using PMS.Model;
namespace PMS.IDAL
{
  public partial interface IUserDal:IBaseDal<User>
  {

  }
}

UserDal实现IUserDal接口：

public partial class UserDal : BaseDal<User>,IUserDal

数据会话层的构建

抽象工厂类AbstractFactory：

using System.Configuration;
using System.Reflection;
using PMS.IDAL;

namespace PMS.DALFactory
{
  public partial class AbstractFactory
  {
    //读取保存在配置文件中的程序集名称与命名空间名
    private static readonly string AssemblyPath = ConfigurationManager.AppSettings["AssemblyPath"];
    private static readonly string NameSpace = ConfigurationManager.AppSettings["NameSpace"];
    /// <summary>
    /// 获取UserDal的实例
    /// </summary>
    /// <returns></returns>
    public static IUserDal CreateUserInfoDal()
    {
      var fullClassName = NameSpace + ".UserInfoDal";
      return CreateInstance(fullClassName) as IUserDal;
    }
    /// <summary>
    /// 通过反射获得程序集中某类型的实例
    /// </summary>
    /// <param name="className"></param>
    /// <returns></returns>
    private static object CreateInstance(string className)
    {
      var assembly = Assembly.Load(AssemblyPath);
      return assembly.CreateInstance(className);
    }
  }
}

数据会话类DbSession：

using System.Data.Entity;
using PMS.IDAL;
using PMS.DAL;

namespace PMS.DALFactory
{
  public partial class DbSession:IDbSession
  {
    public DbContext Db
    {
      get { return DbContextFactory.CreateContext(); }
    }

    private IUserDal _userDal;
    public IUserDal UserDal
    {
      get { return _userDal ?? (_userDal = AbstractFactory.CreateUserInfoDal()); }
      set { _userDal = value; }
    }

    /// <summary>
    /// 工作单元模式，统一保存数据
    /// </summary>
    /// <returns></returns>
    public bool SaveChanges()
    {
      return Db.SaveChanges() > 0;
    }
  }
}

								 
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