using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace DynamicLoadDLL
{
 /// <summary>
 /// 动态加载dll
 /// </summary>
 public class LoadDLL
 {
  private Assembly ass = null;
  /// <summary>
  /// 加载dll
  /// </summary>
  /// <param name="dllPath">dll文件路径</param>
  public LoadDLL(string dllPath)
  {
   this.ass = Assembly.LoadFrom(dllPath);
  //利用dll的路径加载(fullname)
  }
  /// <summary>
  /// 返回反射的dll
  /// </summary>
  /// <returns></returns>
  public Assembly GetAssembly()
  {
   return this.ass;
  }
  /// <summary>
  /// 获取所有类名
  /// </summary>
  /// <returns></returns>
  public Type[] GetClass()
  {
   return ass.GetTypes();
  }
  /// <summary>
  /// 获取程序集下的所有文件名
  /// </summary>
  /// <returns></returns>
  public Module[] GetModules()
  {
   return ass.GetModules();
  }
  /// <summary>
  /// 获取程序集清单文件表中的文件
  /// </summary>
  /// <returns></returns>
  public FileStream[] GetFiles()
  {
   return ass.GetFiles();
  }
 }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace DynamicLoadDLL
{
 /// <summary>
 /// 加载类
 /// </summary>
 public class LoadClass
 {
  private static LoadClass dlc = null;
  private Type type;
  private object obj = null;
  //实例
  /// <summary>
  /// 加载dll
  /// </summary>
  /// <param name="ass">dll引用</param>
  /// <param name="nameSpace">类的命名空间</param>
  /// <param name="classPath">类名称</param>
  private LoadClass(Assembly ass, string nameSpace, string classPath)
  {
   //加载dll后,需要使用dll中某类.
   type = ass.GetType(nameSpace + "." + classPath);
   //利用类型的命名空间和名称获得类型
   //需要实例化类型,才可以使用,
   //参数可以人为的指定,也可以无参数,静态实例可以省略
   obj = Activator.CreateInstance(type);
  //利用指定的参数实例话类型
  }
  /// <summary>
  /// 加载dll
  /// </summary>
  /// <param name="ass">dll引用</param>
  /// <param name="nameSpace">类的命名空间</param>
  /// <param name="classPath">类名称</param>
  public static LoadClass GetInstance(Assembly ass, string nameSpace, string classPath)
  {
   if (dlc == null)
   {
    dlc = new LoadClass(ass, nameSpace, classPath);
   }
   return dlc;
  }
  /// <summary>
  /// 获取属性集
  /// </summary>
  /// <returns>返回属性值</returns>
  public PropertyInfo[] GetAttrs()
  {
   //调用类型中的某个属性:
   PropertyInfo[] prop = type.GetProperties();
   //通过属性名称获得属性
   //返回属性集
   return prop;
  }
  public MethodInfo[] GetMethods()
  {
   //调用类型中的方法:
   MethodInfo[] method = type.GetMethods(BindingFlags.NonPublic);
   //获得方法集
   //返回方法集
   return method;
  }
  /// <summary>
  /// 获取属性值
  /// </summary>
  /// <param name="attrName">属性名称</param>
  /// <returns>返回属性值</returns>
  public object GetAttrValue(string attrName)
  {
   //调用类型中的某个属性:
   PropertyInfo prop = type.GetProperty(attrName);
   //通过属性名称获得属性
   //返回属性值
   return prop.GetValue(obj);
  }
  /// <summary>
  /// 设置属性值
  /// </summary>
  /// <param name="attrName">属性名称</param>
  /// <returns>返回属性值</returns>
  public void SetAttrValue(string attrName, string attrValue)
  {
   //调用类型中的某个属性:
   PropertyInfo prop = type.GetProperty(attrName);
   //通过属性名称获得属性
   //返回属性值
   prop.SetValue(obj, attrValue);
  }
  /// <summary>
  /// 执行类方法
  /// </summary>
  /// <param name="methodName">方法名称</param>
  /// <param name="paras">参数</param>
  /// <param name="types">参数类型</param>
  /// <returns></returns>
  public object GetMethod(string methodName, object[] paras,Type[] types)
  {
   //调用类型中的某个方法:
   MethodInfo method = type.GetMethod(methodName,types);
   //通过方法名称获得方法
   //执行方法
   return method.Invoke(obj, paras);
  }
 }
}