如何动态填充Imagelist（数据库中的数据）C＃

Question

I need to populate an ImageList dynamically. Means I stored image names in a database table. But images are in categories folder inside project folder (1.jpg, 2.jpg...) using a while loop I tried to add image into ImageList and bind to the ListView .

Here is my code and TABLE. No errors but images are not loading. I am not sure image path is correct or not. What is wrong with my code and how to do that?

public void show()
{
    ImageList imgs = new ImageList();
    imgs.ImageSize = new Size(50,50);

    MySqlConnection con = cn.connection();
    MySqlCommand cmd = new MySqlCommand();
    cmd.Connection = con;
    cmd.CommandText = "SELECT * FROM categories";
    MySqlDataReader rd;
    con.Open();
    rd = cmd.ExecuteReader();
    while (rd.Read())
    {
        try
        {
            imgs.Images.Add(Image.FromFile("./categories/" + rd.GetString(2)));
        }
        catch (Exception e) {
            MessageBox.Show(e.Message);
        }
    }
    listView1.SmallImageList = imgs;
    while (rd.Read())
    {
        listView1.Items.Add("asas",rd.GetString(0));
    }
}

TABLE

IMAGE PATH

C:\vb\nishantha\pos3\categories

PROJECT FOLDER

enter image description here

IMAGE FOLDER

enter image description here

Answer 1

Try this

imgs.Images.Add(Bitmap.FromFile("\\categories\\" + rd.GetString(2)));

might help you achieve it And the next while loop might be a problem since running the first loop already read all the records from the DB. So if you want you can include the same in the first loop itself.

listViewItem lvi = new listViewItem();
while (rd.Read())
{
    try
    {
        imgs.Images.Add(Bitmap.FromFile("\\categories\\" + rd.GetString(2)));
        lvi.SubItems.Add(rd.GetString(0));
    }
    catch (Exception e) {
        MessageBox.Show(e.Message);
    }
}
listView1.Items.Add(lvi);
listView1.SmallImageList = imgs;

Answer 2

Make sure categories folder with files is available in root directory.

eg if you are building the application in debug mode, then categories folder and files should be in ~/debug/categories/..jpg. for doing this take below steps:

Expand categories folder, select all files --> Right click --> Property --> CopyToOutputDirectory to Copy always.

Finally in last line for adding the items in the listview change the below code:

while (rd.Read())
{
   listView1.Items.Add("asas",rd.GetString(0));
}

To

for (int j = 0; j < imgs.Images.Count; j++)
{
    ListViewItem item = new ListViewItem();
    item.ImageIndex = j;
    item.Text = "asdf";

    this.listView1.Items.Add(item);
}