Question

我的列表视图应该为指定路径上的每个目录创建一个组，并将每个目录中的图片添加到为其创建的组中;但它会将最后一个目录中的图片添加到每个组中。任何想法我怎样才能解决这个问题？谢谢！

       private void Form2_Load(object sender, EventArgs e)
    {    

      string path = @"C:\pics\";
      string[] tabs_needed = System.IO.Directory.GetDirectories(path);


        foreach (string folder in tabs_needed)
        {
            FileInfo f = new FileInfo(folder);
            listBox1.Items.Add(f.Name);
            TabPage ghhk = new TabPage(f.Name);
            tabControl1.Controls.Add(ghhk);
            ListView listView1 = new ListView();
            ghhk.Controls.Add(listView1);
            listView1.Dock = DockStyle.Fill;

            string new_path = path + f.Name;

    string[] groups_needed =System.IO.Directory.GetDirectories(new_path);



            foreach (string ufolder in groups_needed)
            {

                FileInfo uf = new FileInfo(ufolder);

         string f_path = String.Concat(new_path + @"\" + uf.Name + @"\");
                DirectoryInfo dir = new DirectoryInfo(f_path);
                ImageList imagelist = new ImageList();

                foreach (FileInfo file in dir.GetFiles())
                {

                    try
                    {
                       imagelist.Images.Add(Image.FromFile(file.FullName));

                    }
                    catch
                    {

                    }

                }

                imagelist.ImageSize = new Size(32, 32);

                listView1.View = View.LargeIcon;

                ListViewGroup gr1 = new ListViewGroup(uf.Name);
                listView1.Groups.Add(gr1);
                string tpath = String.Concat(f_path, "gf.txt");

                for (int counter = 0; counter < imagelist.Images.Count; counter++)
                {

                    ListViewItem item = new ListViewItem();
                    item.Text = File.ReadAllLines(tpath).Skip(counter).Take(1).First();
                    item.ImageIndex = counter;


                    item.Group = gr1;
                    listView1.Items.Add(item);

                }
                 listView1.LargeImageList = imagelist;
                }

Answer 1

这种情况正在发生，因为您每次都在foreach循环中实例化ImageList。当您最终将图像列表分配给listView1.LargeImageList时，它只是附加的最终图像列表实例。

您需要将实例化移出foreach循环

ImageList imagelist = new ImageList();

foreach (string ufolder in groups_needed)
{
    ...
}

由于ImageList不在循环中，您可能还需要更改ImageIndex的逻辑才能使其正常工作。

Answer 2

你应该替换

listView1.LargeImageList = imagelist;

带

listView1.LargeImageList.Images.AddRange(imagelist.Images.Cast<System.Drawing.Image>().ToArray())

因为您在每个周期都覆盖了图像列表。

Listview在每个组中放置相同的图像

2 个答案: