C mouse event and keyboard event of C (XXVIII)

Look at the mouse event today 、 Keyboard events .

1： There are two kinds of mouse events ：

EventArgs：MouseEnter/MouseLeave etc.

MouseEventArgs：MouseDoubleClick、MouseDown、MouseUp、MouseHover、MouseMove.

private void button1_MouseEnter(object sender, EventArgs e)
        {
            label1.Text = " Button entry event ";
        }
 
        private void button1_MouseLeave(object sender, EventArgs e)
        {
            label1.Text = " Button leave event ";
        }
 
        private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            label2.Text = " Double click the form event ";
        }
 
        private void button2_MouseDown(object sender, MouseEventArgs e)
        {
            label2.Text = " Press the button 2";
        }
 
        private void button2_MouseUp(object sender, MouseEventArgs e)
        {
            label2.Text = " Release the button 2";
        }
 
        private void button2_MouseHover(object sender, EventArgs e)
        {
            label3.Text = " Mouse on button 2 Stayed on for some time ";
        }
 
        private void button2_MouseMove(object sender, MouseEventArgs e)
        {
            label4.Text = " Mouse on button 2 Go through ";
        }

2： Keyboard events

KeyEventArgs：

KeyPressEventArgs：

KeyPress： It can only be used when the focus is on the control .（ Press and release to happen ）

KeyDown： Occurs when the key is pressed

KeyUp： It happens when you lift the key

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            label1.Text += e.KeyChar;
        }

Keyboard events are similar to mouse events , Here are just some concepts , Relevant cases will be added later .

Test using code ：

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 mianbanGc
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_MouseEnter(object sender, EventArgs e)
        {
            label1.Text = " Button entry event ";
        }
 
        private void button1_MouseLeave(object sender, EventArgs e)
        {
            label1.Text = " Button leave event ";
        }
 
        private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            label2.Text = " Double click the form event ";
        }
 
        private void button2_MouseDown(object sender, MouseEventArgs e)
        {
            label2.Text = " Press the button 2";
        }
 
        private void button2_MouseUp(object sender, MouseEventArgs e)
        {
            label2.Text = " Release the button 2";
        }
 
        private void button2_MouseHover(object sender, EventArgs e)
        {
            label3.Text = " Mouse on button 2 Stayed on for some time ";
        }
 
        private void button2_MouseMove(object sender, MouseEventArgs e)
        {
            label4.Text = " Mouse on button 2 Go through ";
        }
 
        public string str = "";
        private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            str += e.KeyChar;
            label5.Text += e.KeyChar;
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
 
        private void label5_Click(object sender, EventArgs e)
        {
 
        }
    }
}

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