C# 例9.7 例9-9

例9.7

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 WindowsFormsApp4
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        private int nCounter;
        private void Form2_Load(object sender, EventArgs e)
        {
            this.nCounter = 20;
            this.ShowCounter();
        }
        private void ShowCounter()
        {
            string strMsg = this.nCounter.ToString("D8");
            this.label1.Text = strMsg;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            this.nCounter++;
            this.ShowCounter();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            this.nCounter--;
            this.ShowCounter();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            string strMsg = "当前计数器=" + this.nCounter.ToString("D8");
            MessageBox.Show(strMsg, "提示");
        }
    }
}

例9.9

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 WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = this.label1.Text;
        }
    }
}