C# 编译生成dll文件供程序调用的两种方法

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
namespace ClassLibrary1 
{ 
 public partial class Form1 : Form 
 { 
  public Form1() 
  { 
   InitializeComponent(); 
  } 
  private void button1_Click(object sender, EventArgs e) 
  { 
   MessageBox.Show("调用成功！"); 
  } 
 } 
} 

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
using System.Runtime.InteropServices; 
using ClassLibrary1; //引入命名空间 
namespace 调用DLL 
{ 
 public partial class Fo : Form 
 { 
  public Fo() 
  { 
   InitializeComponent(); 
  } 
  private void button1_Click(object sender, EventArgs e) 
  { 
   Form1 f = new Form1(); //实例化对象 调用 
   f.Show(); 
  } 
 } 
}