1-Exam17-Facty

  <add key="DALS" value="Exam17.DAL" />

<connectionStrings>
<add name="Model1" connectionString="Data Source=.;Initial Catalog=Q;Integrated Security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />
</connectionStrings>

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace Facty
{
public class factyer<T> where T : class
{

private static readonly string path = ConfigurationManager.AppSettings["DALS"].ToString();//获取配置文件中的DAL层

public static T GetInstance(string type)
{
try
{
string classname = string.Format(path + ".{0}", type);//根据用户输入的类库获取类库下的操作类

return (T)Assembly.Load(path).CreateInstance(classname);//将得到的程序集中的类实例化并且返回给业务层
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}

}
}
}