从.NET中的同一对话框中选择文件或文件夹

using System;
using System.Windows.Forms;

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

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Multiselect = true;
            openFileDialog.ShowDialog();
        }
    }
}

using System;
using System.Windows.Forms;

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

        private void button1_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog();
            folderBrowserDialog.ShowDialog();
        }
    }
}