【程式設計】【C#】使用OpenFileDialog來開啟文字檔案

程式專案下載：openTextFile

程式中的元件：

1．OpenFileDialog

2．Button

3．TextBox，名稱設寫tbResult，多行，垂直scrollbar

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 WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // 建立一個OpenFileDialog物件
            OpenFileDialog openFileDialog1 = new OpenFileDialog();

            // 設定OpenFileDialog屬性
            openFileDialog1.Title = "選擇要開啟的文字檔案";
            openFileDialog1.Filter = "Text Files (.txt)|*.txt|All Files (*.*)|*.*";
            openFileDialog1.FilterIndex = 1;

            openFileDialog1.Multiselect = true;

            // 喚用ShowDialog方法，打開對話方塊

            if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {                
                string theFile = openFileDialog1.FileName; //取得檔名
                Encoding enc = Encoding.GetEncoding("big5"); //設定檔案的編碼
                tbResult.Text = System.IO.File.ReadAllText(theFile, enc); //以指定的編碼方式讀取檔案

            }
        }
    }
}