asp.net-mvc – ASP.NET MVC：BLL和DAL到Repository设计

存储库至少有：

> Get-object-by-key操作
> Get-all-objects操作
> Get-first-object-by-query操作
>按查询对象获取操作

一个非常简单的例子:)：

A.产品类,在Common中定义：

public class Product
{
    public int Id { get; private set; }

    public string Code { get; set; }

    public string Name { get; set; }

    public decimal Price { get; set; }
}

B. Query,IRepository和IUnitOfWork的类在DAL.interfaces.dll或Common.dll中定义(但不在DAL中！).

public class Query
{
    public string Text { get; set; }
}

public interface IRepository<TEntity>
    where TEntity : class
{
    bool TryGet(int key,out TEntity value);

    TEntity this[int key] { get; }

    IEnumerable<TEntity> GetAll();

    bool TryGetFirst(Query condition,out TEntity value);

    TEntity GetFirst(Query condition);

    IEnumerable<TEntity> GetAll(Query condition);

    int Count { get; }
}


public interface IUnitOfWork
{
    void SetAdded(TEntity value); // Marks entity as added for further INSERT

    void SetRemoved(TEntity value); // Marks entity as removed for further DELETE

    void SetChanged(TEntity value); // Marks entity as modified for further UPDATE

    void Save(); // Save all the changes 
}

IUnitOfWork了解已更改的实体. Save()为每个更改的实体调用适当的DatabaseHelper / OdbcHelper CRUD方法,以便在数据库中保留更改.

IRepository< Product>,… IRepository< EntityXY>的实现和IUnitOFWork应放在DAL中.然后,BLL使用IRepository和IUnitOFWork来实现业务(域)逻辑. BLL本身可以组织为域模型顶部的服务层,但它超出了讨论的范围:).

我希望我的回答有所帮助.

请随时问我一个问题……

链接：
Patterns of enterpise application architecture by Martin Fowler