DotNet个性化实现工厂类DLL缓存

通过appconfig配置文件实现一种工厂设计模式

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Reflection;

namespace ConsoleApplication1
{
    class TestFactoryFromAppConfig
    {
        /// <summary>
        /// 个性化实现工厂类DLL缓存
        /// </summary>
        private static Dictionary<string, Assembly> _FactoryDllCach = new Dictionary<string, Assembly>();
        public static void Main() 
        {
            TestFactoryFromAppConfig tfac = new TestFactoryFromAppConfig();
            Interface ife = (Interface)tfac.GetFactoryClass("SamTestForFactory");
            ife.SayHello();
            Console.Read();
        }

    private object GetFactoryClass(string p)
    {
 	     /// <summary>
        /// 获取个性化实现工厂类
        /// </summary>
            object actionObj = null;
            string vValue = ConfigurationManager.AppSettings[p];
            string[] typeList = vValue.Split(',');
            try
            {
                System.Reflection.Assembly dll = null;
                if (_FactoryDllCach.ContainsKey(p))
                {
                    dll = _FactoryDllCach[p];
                }
                else
                {
                    dll = Assembly.Load(typeList[1].Trim());
                    _FactoryDllCach.Add(p, dll);
                }
                actionObj = dll.CreateInstance(typeList[0].Trim());
            }
            catch (Exception ex)
            {
                throw new Exception("加载实现类出错！", ex);
            }
            return actionObj;
        }
    }
}

工厂实现类代码如下,其实现了接口中的某某方法:

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1.ChildFolder
{
    class Child : Interface
    {
        #region Interface 成员

        public void SayHello()
        {
            string teacher = "teacher";
            Console.WriteLine("hellow {0}", teacher);
        }

        #endregion
    }
}

接口定义SayHello方法:

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    public interface Interface
    {
        void SayHello();
    }
}

appconfig配置文件定义了一个键值对，通过  ConfigurationManager.AppSettings方法获取值。

<?xml version="1.0" encoding="utf-8" ?>
<configuration>


  <appSettings>

    
    <add key="SamTestForFactory" value="ConsoleApplication1.ChildFolder.Child,ConsoleApplication1"/>
  
  </appSettings>

</configuration>

把程序集放入缓存中，如果下次访问的仍然是同一个键，则无需再次装载程序集，从缓存中读取即可。