I am trying to filter items in a ListView
by using a TextBox
.
I've managed to make something, but it can only delete items from my listview, not bring them back. Here is a little example of my code:
private void textBox1_TextChanged(object sender, EventArgs e)
{
string value = textBox1.Text.ToLower();
for (int i = listView1.Items.Count - 1; -1 < i; i--)
{
if
(listView1.Items[i].Text.ToLower().StartsWith(value) == false)
{
listView1.Items[i].Remove();
}
}
}
Does anybody has an idea on how to retrieve the deleted items? I can't seem to figure it out >:...
check below sample app
using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Linq;
public partial class Form1 : Form
{
// keep list of listview items
List<Data> Items = new List<Data>();
public Form1()
{
InitializeComponent();
// get initial data
Items = new List<Data>(){
new Data(){ Id =1, Name ="A"},
new Data(){ Id =2, Name ="B"},
new Data(){ Id =3, Name ="C"}
};
// adding initial data
listView1.Items.AddRange(Items.Select(c => new ListViewItem(c.Name)).ToArray());
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
listView1.Items.Clear(); // clear list items before adding
// filter the items match with search key and add result to list view
listView1.Items.AddRange(Items.Where(i=>string.IsNullOrEmpty(textBox1.Text)||i.Name.StartsWith(textBox1.Text))
.Select(c => new ListViewItem(c.Name)).ToArray());
}
}
class Data
{
public int Id { get; set; }
public string Name { get; set; }
}