在列表框中显示文件夹，在另一个列表框中显示子文件夹

Question

我正在尝试创建一个 Autocad 插件来预览 datagridview 中的缩略图

我有两个列表框，我想将它们绑定在一起并在 datagridview 中显示 .bmp

1. listbox1 显示目录
2. listbox2 显示所选文件夹 (listbox1) 中的子文件夹
3. 然后 .bmp 文件显示在 datagridview 中

我成功解决了第一个问题

String[] dirs = System.IO.Directory.GetDirectories(@"D:\test\Blocks");
        int i;
        for (i = 0; i < dirs.Length; i++)
        {
            listBox1.Items.Add(Path.GetFileName(dirs[i]));
        }

        String[] files = System.IO.Directory.GetFiles(@"D:\test\Blocks");
        for (i = 0; i < files.Length; i++)
        {
            listBox1.Items.Add(Path.GetFileName(files[i]));
        }

Answer 1

If I understand you correctly, the first listbox lists subfolders, and when one is selected, the second listbox shows the subfolders of the selected item, and when one of those is selected, the datagridview shows the files in that folder.

如果正确，一种方法是在 Form_Load 事件中将 listbox1 的数据源设置为根目录。然后在该列表框的 SelectedIndexChanged 事件中，您可以将 listbox2 的数据源设置为在 listbox1 中选择的项目。并且在listbox2的SelectedIndexChanged事件中，可以将DataGridView的数据源设置为listbox2中选中的项目。

类似这样的：

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

    private string rootDirectory = @"D:\test\Blocks";

    private void Form1_Load(object sender, EventArgs e)
    {
        listBox1.DataSource = Directory.GetDirectories(rootDirectory)
            .Select(Path.GetFileName).ToList();
        listBox1.SelectedIndexChanged += ListBox1_SelectedIndexChanged;
        listBox2.SelectedIndexChanged += ListBox2_SelectedIndexChanged;
    }

    private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        var parentDir = Path.Combine(rootDirectory, listBox1.SelectedItem.ToString());
        listBox2.DataSource = Directory.GetDirectories(parentDir)
            .Select(Path.GetFileName).ToList();
    }

    private void ListBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        var parentDir = Path.Combine(rootDirectory, listBox1.SelectedItem.ToString(), 
            listBox2.SelectedItem.ToString());
        dataGridView1.DataSource = Directory.GetFiles(parentDir)
            .Select(f => new { FileName = Path.GetFileName(f) }).ToList();
    }
}