form1.cs

来自「Visual C#2005程序设计教程」· CS 代码 · 共 55 行

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace LT14_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = "try—finally语句示例";
            label1.Text = "源 文 件";
            label2.Text = "";
            button1.Text = "检 查";
            button2.Text = "退 出";
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (File.Exists(textBox1.Text))   // 判断文件是否存在
                {
                    label2.Text = "该文件存在";
                }
                else
                {
                    label2.Text = "该文件不存在";
                }

            }
            
            finally  // 无论是否发生异常，都正常结束
            {
                MessageBox.Show("感谢使用本软件!","程序结束"); 
            } 

        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}