需要帮助从专业人士（帮助）？从选定的目录列表框1获取文件到listbox2？ [英] Need Help from pro (Help) ?Get file from selected Directory listbox1 into listbox2?

问题描述

private void Form2_Load(object sender, EventArgs e)
       {
           string path = @"\\192.168.**.**\**\**";
           string[] dirs = Directory.GetDirectories(path);

           // For folders in the directory
           foreach (string dir in dirs)
               listBox1.Items.Add(dir);
       }


private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            listBox2.Items.Clear();
            DirectoryInfo dir = (DirectoryInfo)listBox1.SelectedItem;
            foreach (FileInfo img in dir.GetFiles())
                listBox2.Items.Add(img);            
        }

//  Error Occur >>>> An unhandled exception of type 'System.InvalidCastException'

推荐答案

嗯，你有什么期望？

查看您的代码：

Well, what did you expect?
Look at your code:

foreach (string dir in dirs)
   listBox1.Items.Add(dir);

DirectoryInfo dir = (DirectoryInfo)listBox1.SelectedItem;

因此ListBox中的每个项目都是一个字符串，并且您正在尝试将其强制转换为DirectoryInfo。没有这样的演员！



尝试：

So every item in the ListBox os a string, and you are trying to cast it to a DirectoryInfo. There is no such cast!

Try:

DirectoryInfo dir = new DirectoryInfo(listBox1.SelectedItem);

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    listBox2.Items.Clear();
    DirectoryInfo dir = new DirectoryInfo(listBox1.Text);
    foreach (FileInfo img in dir.GetFiles())
    {
        // Adds the full path
        //listBox2.Items.Add(img.FullName);

        // Adds just the filename
        listBox2.Items.Add(img.Name);
    }
}

DirectoryInfo dir = new DirectoryInfo（listBox1.SelectedItem）;



到



DirectoryInfo dir = new DirectoryInfo（listBox1.Text）;



/ /这有效。

DirectoryInfo dir = new DirectoryInfo(listBox1.SelectedItem);

To

DirectoryInfo dir = new DirectoryInfo(listBox1.Text);

//This works.

这篇关于需要帮助从专业人士（帮助）？从选定的目录列表框1获取文件到listbox2？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！