C#实验三编写一个加法计算器

实验三 .Net中基本控件的编程

编写一个加法计算器：

\1. 点击求和按钮可以求和

\2. 先输入加数，在输入被加数时，边输入边自动求和

\3. 边输入加数或被加数边判断用户输入是否为数字，如果不是数字不显示，并给用户提示。

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        

        private void TextBox1_TextChanged(object sender, EventArgs e)
        {
        }

        private void textBox1_keyPressed(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar >= '0' && e.KeyChar <= '9' || e.KeyChar=='.' || e.KeyChar == '\b' )
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
                MessageBox.Show("请输入数字！");
            }
        }
        private void TextBox2_TextChanged(object sender, EventArgs e)
        {
            try
            {
                double a = double.Parse(textBox1.Text);
                double b = double.Parse(textBox2.Text);
                textBox3.Text = (a + b).ToString();
            }
            catch (Exception wrong)
            {
                MessageBox.Show("请输入数字！");
                wrong.ToString();
            }
        }
        private void textBox2_keyPressed(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar >= '0' && e.KeyChar <= '9' || e.KeyChar == '\b' || e.KeyChar == '.')
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
                MessageBox.Show("请输入数字！");
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                double a = double.Parse(textBox1.Text);
                double b = double.Parse(textBox2.Text);
                textBox3.Text = (a + b).ToString();
            }
            catch (Exception wrong)
            {
                MessageBox.Show("请输入数字！");
                wrong.ToString();
            }
        }
    }

还缺少判断小数点的代码。比如连续输入两个小数点的情况。