GC模式

创建一个借口类IDAL：不需要方法体的方法。将class装换成interface
MVC:web.config <add key="CDAL" value="DAL"/>
API的web.config <add key="CDAL" value="DAL"/>添加到<appSettings>

创建一个接口  没有方法体的方法

namespace IDAL
{
using MODEL;
public interface IdalUser
{
int UsertAdd(Usert user);
int Login(string name,string pass);

}
}

namespace IDAL
{
using MODEL;
public interface IImagedal
{
int ImagesAdd(ImageModel img);

/// <summary>
/// 获取所有的信息
/// </summary>
/// <returns></returns>
List<ImageModel> GetImage();
}
}

建立一个工厂类：

namespace GongChang
{
using System.Configuration;

using System.Reflection;
using IDAL;
public class gongchang
{
private static readonly string kname = ConfigurationManager.AppSettings["CDAL"];
public IdalUser CreateuserDAL()
{
return (IdalUser)Assembly.Load(kname).CreateInstance(kname + ".UsertDal");
}
public IImagedal CreateimgDAL()
{
return (IImagedal)Assembly.Load(kname).CreateInstance(kname + ".ImageDal");
}
}
}

BLL实例化：

using MODEL;
using DAL;
using GongChang;
using IDAL;

gongchang gc = new gongchang();
IImagedal bll = null;
public ImagesBll()
{
if (bll == null)
{
bll = gc.CreateimgDAL();
}
}
//ImageDal bll = new ImageDal();

MVC api 记者引用接口