Question

I have a List in my custom user control. I’d like the control to redraw the each Image in the List whenever the contents of that list is changed. Either a movement, addition or removal of an items should fire an event.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WebServiceScanner
{
    public partial class imageList : UserControl
    {
        public imageList()
        {
            InitializeComponent();
        }

        public List<Image> Images { get; set; }

        public void AddImage(Image image)
        {
            Images.Add(image);
        }

        public void RemoveImage(Image image)
        {
            Images.Remove(image);
        }

        public void MoveImageLeft(int index)
        {
            Image tmpImage = Images[index];
            Images[index] = Images[index - 1];
            Images[index - 1] = tmpImage;
        }

        public void MoveImageLeft(int index)
        {
            Image tmpImage = Images[index];
            Images[index] = Images[index + 1];
            Images[index + 1] = tmpImage;
        }
    }
}

Can this be done?

Thanks for your guidance! Eager to learn!

Answer 1

You can use an ObservableCollection<T> instead of a List<T> and handle its CollectionChanged event.