C# 从另一个 class 填充列表视图

Question

I have a list view in MainForm but i want to method the code to another class named MaintenanceClass

here is the code in the MainForm to load data into the listview from a text file.

List<string> data = File.ReadAllLines(Application.StartupPath + "\\Maintenance\\" + "\\ReportFieldList\\" + "File.txt").ToList();

foreach (string d in data)
{
  string[] items = d.Split(':').Select(a => a.Trim()).ToArray();
  lvFieldList.Items.Add(new ListViewItem(items));
}

Here is the method on MaintenanceClass and its giving error that lvFieldList does not exist. lvFieldList is defined on the MainForm

how can i populate the listview in the MainForm using a method in another class named MaintenanceClass?

Answer 1

Listview items have Text and SubItems you need to attend the first element of your array to listview item's Text value and the rest will be added as SubItems

foreach(string d in data)
{
    string[] items = d.Split(':').Select(a => a.Trim()).ToArray();
    ListViewItem item = new ListViewItem();
    item.Text=items[0];
    for(int i=1;i<items.Count;i++)
    {
        item.SubItems.Add(items[i]);
    }
    lvFieldList.Items.Add(item);
}

Answer 2

You should not perform the add item to the ListView in the method reading the file.

Below is the bare minimum for a path to take.

Use an event as shown below.

public class FileOperations
{
    public delegate void ProcessLine(string[] sender);
    public event ProcessLine ProcessLineEvent;
    public void ReadFile(string fileName)
    {
        var lines = File.ReadAllLines(fileName);
        foreach (var line in lines)
        {
            ProcessLineEvent?.Invoke(line.Split(','));
        }
    }
}

Call the method in a form

var operations = new FileOperations();
operations.ProcessLineEvent += OnProcessLine;
operations.ReadFile("TODO");

Add item in this event

private static void OnProcessLine(string[] sender)
{
    // add item
}