本文共 1237 字，大约阅读时间需要 4 分钟。

代码如下：

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 _3{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {                label1.ForeColor = Color.Red;        }        private void button2_Click(object sender, EventArgs e)        {            label1.ForeColor = Color.Blue;        }        private void button3_Click(object sender, EventArgs e)        {            Close();        }        private void button1_Click_1(object sender, EventArgs e)        {            float ss, ee;            ss = Convert.ToSingle(textBox1.Text);            ee = Convert.ToSingle(textBox2.Text);            textBox3.Text = Convert.ToString(ss * ee);        }        private void button2_Click_1(object sender, EventArgs e)        {            textBox1.Text = "";            textBox2.Text = "";            textBox3.Text = "";        }        private void button3_Click_1(object sender, EventArgs e)        {            Close();        }    }}

执行效果如下：

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