static void Main(string[] args)
    {
      //dll文件路徑
      string path = @"D:\VS2015Project\001\Computer\bin\Debug\computer.dll";

      //加載dll文件
      Assembly asm = Assembly.LoadFile(path);

      //獲取類
      Type type = asm.GetType("Computer.Computer");

      //創(chuàng)建該類型的實例
      object obj = Activator.CreateInstance(type);

      //獲取該類的方法
      MethodInfo mf = type.GetMethod("ShowDrives");

      //調(diào)用方法
      mf.Invoke(obj, null);

      Console.ReadKey();
    } 

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;


namespace Computer
{
  public class Computer
  {
    private DriveInfo[] drives;
    public Computer()
    {
      this.drives = DriveInfo.GetDrives();
    }
    public void ShowDrives()
    {
      Console.WriteLine("該電腦的磁盤驅(qū)動器有：\r\n");
      foreach (var item in drives)
      {
        Console.WriteLine(item);
      }
    }
  }
}