C#之winform基础 button1_Click(object sender, EventArgs e)中sender是啥及其用法

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Threading.Tasks;
 9 using System.Windows.Forms;
10 
11 namespace WindowsFormsApplication1
12 {
13     public partial class Form1 : Form
14     {
15         public Form1()
16         {
17             InitializeComponent();
18         }
19 
20         private void button1_Click(object sender, EventArgs e)
21         {
22             //sender object类型，里面装的是button1,这就是关键一点了。
23             Button btn = (Button)sender;
24             textBox1.Text = btn.Text;
25         }
26 
27         private void button2_Click(object sender, EventArgs e)
28         {
29             //这个sender里面装的是button2
30             button1_Click(sender, e);
31         }
32     }
33 }