运行结果.PNG

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;
using System.IO;

namespace WindowsFormsApp6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if(textBox1.Text=="")
            {
                MessageBox.Show("请输入文件夹名称!");
            }
            else
            {
                DirectoryInfo d = new DirectoryInfo(textBox1.Text);
                //实例化一个输入内容的目录
                if(d.Exists)
                {
                    MessageBox.Show("目录已存在,请重新输入");
                }
                else
                {
                    d.Create();
                }
            }
        }
    }
}