WinForms: Binding a List of Custom Objects to a ListView with VirtualMode Issues
I tried several approaches but none seem to work. Hey everyone, I'm running into an issue that's driving me crazy. I'm trying to implement a `ListView` in a WinForms application using `VirtualMode` to display a large dataset efficiently. I have a custom class called `Employee` that contains properties like `Id`, `Name`, and `Department`. The question arises when I attempt to implement the `RetrieveVirtualItem` method; it seems that the `ListView` isn't updating correctly when I modify the underlying data source. Specifically, I receive an 'Index was outside the bounds of the array' behavior when I try to scroll through the list, suggesting that the `ListView` is not aware of the changes in the data. Here's a simplified version of what I'm working with: ```csharp public class Employee { public int Id { get; set; } public string Name { get; set; } public string Department { get; set; } } public class MainForm : Form { private ListView listViewEmployees; private List<Employee> employees; public MainForm() { InitializeComponent(); employees = new List<Employee>(); // Assume employees are populated here listViewEmployees.VirtualMode = true; listViewEmployees.VirtualListSize = employees.Count; listViewEmployees.RetrieveVirtualItem += ListViewEmployees_RetrieveVirtualItem; } private void ListViewEmployees_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e) { if (e.ItemIndex >= 0 && e.ItemIndex < employees.Count) { e.Item = new ListViewItem(new[] { employees[e.ItemIndex].Id.ToString(), employees[e.ItemIndex].Name, employees[e.ItemIndex].Department }); } else { e.Item = new ListViewItem(new[] { "N/A", "N/A", "N/A" }); // Handle out-of-bounds access } } private void UpdateEmployeeList() { // Code to update the employees list listViewEmployees.VirtualListSize = employees.Count; // Update the size listViewEmployees.Invalidate(); // Request a repaint } } ``` I've called `listViewEmployees.VirtualListSize = employees.Count;` in my `UpdateEmployeeList` method whenever the data source changes, but the `ListView` still gives an behavior when scrolling. I suspect that the `RetrieveVirtualItem` method might not be handling the index correctly after the data changes. Is there something I'm missing here? How can I ensure that the `ListView` updates properly without causing index out of bounds errors during scrolling? My development environment is Linux. This is my first time working with C# 3.9. How would you solve this?