c＃当imageList绑定到ListView中时，imageList第一个图像不显示

Question

I,am having a Listview controller bind with imageList both Listview items and Imagelist images add through a while loop. with dataReader(). the problem is after adding both items, Listview item shows correct but 1st image not displaying means images starting from 2nd listview item. I checked every thing with debugging mode. then I confused on imagelist , because 1st time when it runs it shows COUNT as 1 then next loop again it's COUNT became 0 and the next time it 1,2,3,4,5,6 .... etc.

private void populate(MySqlDataReader data)
        {
            //ImageList
            ImageList imgList = new ImageList();

            //set listview category items as Large icons
            listView_Category.View = View.LargeIcon;
            imgList.Images.Clear();

            //ADD image list into Listview
            listView_Category.LargeImageList = imgList;

            Application.DoEvents();

            int i = 0;
            while (data.Read())
            {
                try
                {
                    imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/" + data.GetString(2)));
                }
                catch (Exception w)
                {
                    MessageBox.Show(w.Message);
                }

                imgList.ImageSize = new Size(100, 100);
                imgList.ColorDepth = ColorDepth.Depth32Bit;

                listView_Category.Items.Add(data.GetString(1), i);
                i++;

            }
        }

I try to add images manually also... when it is not working. only it's adding images through a loop. is it a Language bug.?

//imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-1.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-2.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-3.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-4.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-5.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-6.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-7.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-8.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-9.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-10.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-11.jpg"));
            //imgList.Images.Add(Image.FromFile(@"./" + populateFolder + "/image-12.jpg"));

Database

Answer 1

Please try this this this code will rad all files from a folder and add show it in the listview . The you just need to change the logic for reading it form DB .

    private void Form1_Load(object sender, EventArgs e)
    {
        var folderPath = @"c:\images\";
        DirectoryInfo dir = new DirectoryInfo(folderPath);

        var imageList = new ImageList();
        foreach (FileInfo file in dir.GetFiles())
        {
            try
            {
               imageList.Images.Add(Image.FromFile(file.FullName));
            }
            catch{
                Console.WriteLine("This is not an image file");
            }
        }
        this.listView1.View = View.LargeIcon;
        imageList.ImageSize = new Size(128, 128);
        this.listView1.LargeImageList = imageList;

        for (int j = 0; j < imageList.Images.Count; j++)
        {
            ListViewItem item = new ListViewItem();
            item.ImageIndex = j;
            this.listView1.Items.Add(item);
        }
    }