练习：WinForm 对话框控件（显示、获取）

设计界面：

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

        private void button1_Click(object sender, EventArgs e)
        {
            colorDialog1.ShowDialog();  //显示颜色选择器
            panel1.BackColor = colorDialog1.Color; //将选定颜色赋值给panel的背景色 
        }

        private void button2_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.ShowDialog();    //显示文件夹选择器
            label1.Text = folderBrowserDialog1.SelectedPath; //获取文件路径

        }

        private void button3_Click(object sender, EventArgs e)
        {
            fontDialog1.ShowDialog();
            label2.Font = fontDialog1.Font;
        }

        private void button4_Click(object sender, EventArgs e)
        {   
            //设置打开文件类型
            openFileDialog1.Filter = "文本文件|*.txt|所有文件|*.*";
            
            //显示文件选择器
            DialogResult dr = openFileDialog1.ShowDialog();
            
            //获取文件路径
            if (dr == DialogResult.OK)     //判断用户是否选择了文件
            {
                label3.Text = openFileDialog1.FileName;
            }
        }

        private void button5_Click(object sender, EventArgs e)
        {
            //显示文件选择器
            DialogResult dr = saveFileDialog1.ShowDialog();
            
            //获取文件路径
            if (dr == DialogResult.OK)     //判断用户是否选择了文件
            {
                label4.Text = saveFileDialog1.FileName;
            }
        }
    }
}