获取字母的ASCII码

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;



namespace Ex04_01

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            if (textBox1.Text == "")

            {

                MessageBox.Show("字母文本框不能为空", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);

                textBox1.Focus();

            }

            else

            {

                byte[] array = new byte[1];   

                array = System.Text.Encoding.ASCII.GetBytes(textBox1.Text.Trim());

                int asciicode = (short)(array[0]);

                textBox2.Text = Convert.ToString(asciicode);