C# EF Core 简单工厂模式，接口多继承实例(三)

一、说明

1.本实例是基于.Net Core 1.1,EF Core 1.1的代码实例，仅供参考

2.当前版本的EF Core好像还没有提供模型验证，异常跟踪等

二、实体层，自动 生成

三 、接口层

1.基础 接口 

/// <summary> /// 基础访问接口，使用泛型 /// </summary> public interface IBaseAbstract<T> where T : class { #region 基础访问 /// <summary> /// 获取表达树 /// </summary> /// <returns></returns> DbSet<T> GetDbSet(); /// <summary> /// 根据主键 获取对象 /// </summary> /// <param name="id"></param> /// <returns></returns> T GetModel(object id); /// <summary> /// 添加对象 /// </summary> /// <param name="model">实例对象</param> /// <returns></returns> bool Add(T model); /// <summary> /// 修改对象 /// </summary> /// <param name="model">实例对象</param> /// <returns></returns> bool Modify(T model); /// <summary> /// 删除对象 /// </summary> /// <param name="model">实例对象</param> /// <returns></returns> bool Delete(T model); /// <summary> /// 删除 对象 /// </summary> /// <param name="id">主键ID</param> /// <returns></returns> bool Delete(object id); #endregion }2.业务接口

namespace NotifyBird.Abstract { /// <summary> /// 消息内容，接口 /// </summary> public interface IMessage : IBaseAbstract<Message> { } }

四、接口实现，实例工厂层

1.基础操作

/// <summary> /// 基础类型操作 /// 重点实现基础接口中的操作 /// </summary> internal class BaseOperate<T> where T : class { public NotifyBirdContext Context = null; public BaseOperate() { Context = new NotifyBirdContext(); } #region 其他操作 /// <summary> /// 保存数据 /// </summary> /// <returns></returns> public int Save() { return Context.SaveChanges(); } /// <summary> /// 标间对象为修改状态，并保存 /// </summary> public bool SetModify<T>(T model) where T : class { Context.Entry<T>(model).State = EntityState.Modified; return Save() > 0; } #endregion #region 基础访问 /// <summary> /// 获取表达树 /// </summary> /// <returns></returns> public DbSet<T> GetDbSet() { return Context.Set<T>(); } /// <summary> /// 根据主键 获取对象 /// </summary> /// <param name="id"></param> /// <returns></returns> public T GetModel(object id) { return GetDbSet().Find(id); } /// <summary> /// 添加对象 /// </summary> /// <param name="model">实例对象</param> /// <returns></returns> public bool Add(T model) { try { GetDbSet().Add(model); return Save() > 0; } catch (Exception ex) { return Error_Add(ex); } } /// <summary> /// 修改对象 /// </summary> /// <param name="model">实例对象</param> /// <returns></returns> public bool Modify(T model) { try { return SetModify(model); } catch (Exception ex) { return Error_Modify(ex); } } /// <summary> /// 删除对象 /// </summary> /// <param name="model">实例对象</param> /// <returns></returns> public bool Delete(T model) { try { GetDbSet().Remove(model); return Save() > 0; } catch (Exception ex) { return Error_Delete(ex); } } /// <summary> /// 删除 对象 /// </summary> /// <param name="id">主键ID</param> /// <returns></returns> public bool Delete(object id) { try { T model = GetModel(id); if (model == null) throw new Exception($"获取id={id}的对象失败,当前类型:{model.GetType().Name}"); return Delete(model); } catch (Exception ex) { return Error_Delete(ex); } } #endregion #region 异常处理 private string GetErrorMsg(Exception ex) { StringBuilder builder = new StringBuilder(); Exception inner = ex; int i = 0; while (inner != null) { i++; builder.AppendFormat("内部原因{0}:{1}", i, ex.Message); builder.AppendLine(); inner = inner.InnerException; } return builder.ToString(); } /// <summary> /// 添加数据异常 /// </summary> /// <param name="ex"></param> /// <returns></returns> public bool Error_Add(Exception ex) { throw new Exception("添加数据失败，" + GetErrorMsg(ex)); } /// <summary> /// 修改数据异常 /// </summary> /// <returns></returns> public bool Error_Modify(Exception ex) { throw new Exception("修改数据失败，" + GetErrorMsg(ex)); } /// <summary> /// 删除数据异常 /// </summary> public bool Error_Delete(Exception ex) { throw new Exception("删除数据失败，" + GetErrorMsg(ex)); } #endregion }

2.业务操作

/// <summary> /// 消息内容，数据访问操作 /// </summary> internal class MessageOperate : BaseOperate<Message>, IMessage { }

3.实例工厂

注：此处命名空间和接口 相同 ，则在使用 的时候不需要单独引用 Factory

namespace NotifyBird.Abstract { /// <summary> /// 工厂类 ，用于生产接口实例 /// </summary> public class ConcreteFactory { public static IProject GetProject() { return new ProjectOpeate(); } public static IMessage GetMessage() { return new MessageOperate(); } } }更多：

C# EF CodeFirst简单工厂模式，接口多继承实例（二）

C# EF CodeFirst简单工厂模式，接口多继承实例