代码

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 WindowsFormsApp10
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog fb = new FolderBrowserDialog();
            fb.RootFolder = Environment.SpecialFolder.Desktop;
            //设置默认根目录是桌面
            fb.Description = "李药师说:请选择文件目录:";
            //设置对话框说明
            if(fb.ShowDialog()==DialogResult.OK)
            {
                string filePath = fb.SelectedPath;
            }
        }
    }
}

运行结果

运行结果.PNG