技術標籤：C# and Halconc#

C#精彩程式設計200例-第4例-字母-ASCII碼轉化

• • 1. 效果
  • 2. 實現程式碼

1. 效果

2. 實現程式碼

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 Demo4_字母與ASCII碼互相轉換
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public bool IsLetter(char c)
        {
            if (c == char.MinValue) return false;
            if ((c >= 'a' && c <=
 
 'z') || (c >= 'A' && c <= 'Z'))
            {
                return true;
            }
            return false;
        }

        private void btnStringToASCII_Click(object sender, EventArgs e)
        {
            if (this.txbString.Text == string.Empty) return;
            char
 
 c = this.txbString.Text[0];
            if (!IsLetter(c))
            {
                txbToASCII.Text = string.Empty;
                MessageBox.Show("請輸入字母!", "提示!");
            }
            Encoding encode = Encoding.GetEncoding("unicode");
            byte[] bytes = encode.GetBytes(this.txbString.Text);
            this.txbToASCII.Text = bytes[0].ToString();
        }

        private void btnASCIIToString_Click(object sender, EventArgs e)
        {
            if (this.txbASCII.Text == string.Empty) return;
            int number;
            bool bIsNumber = int.TryParse(this.txbASCII.Text, out number);
            if (bIsNumber)
            {
                this.txbToString.Text = ((char)number).ToString();
            }
            else
            {
                this.txbToString.Text = string.Empty;
                MessageBox.Show("請輸入ASCII!", "提示!");
            }
        }
    }
}