Filtrage d'une DataGridView qui n'a pas de liaison de données

La performance globale devrait grandement améliorer si vous supprimez temporairement les lignes de la dataGridView, alors que le filtrage.

1. Créer une application windows forms
2. Déposer un DataGridView et quatre boutons de la forme

3. Copiez et collez ce code (n'oubliez pas d'ajouter des gestionnaires d'événements pour les événements de bouton)

   public partial class Form1 : Form
   {
   public Form1()
   {
   InitializeComponent();
   }
   private Stopwatch watch = new Stopwatch();
   private void Form1_Load(object sender, EventArgs e)
   {
   //populate dataGridView
   for (int i = 0; i < 10000; i++)
   dataGridView1.Rows.Add("Column", i+1, 10000 - i);
   for (int i = 0; i < 10000; i = i + 2)
   dataGridView1.Rows[i].DefaultCellStyle.BackColor = Color.Red;
   }
   //remove filter
   private void button1_Click(object sender, EventArgs e)
   {
   watch.Reset();
   watch.Start();
   foreach (DataGridViewRow row in dataGridView1.Rows)
   row.Visible = true;
   watch.Stop();
   MessageBox.Show(watch.ElapsedMilliseconds.ToString());
   }
   //add filter (hide all odd rows)
   private void button2_Click(object sender, EventArgs e)
   {
   watch.Reset();
   watch.Start();
   foreach (DataGridViewRow row in dataGridView1.Rows)
   {
   if (Convert.ToInt32(row.Cells[1].Value) % 2 != 0)
   row.Visible = false;
   }
   watch.Stop();
   MessageBox.Show(watch.ElapsedMilliseconds.ToString());
   }
   //remove filter (improved)
   private void button3_Click(object sender, EventArgs e)
   {
   watch.Reset();
   watch.Start();
   List<DataGridViewRow> rows = new List<DataGridViewRow>();
   foreach (DataGridViewRow row in dataGridView1.Rows)
   {
   rows.Add(row);
   }
   dataGridView1.Rows.Clear();
   foreach (DataGridViewRow row in rows)
   row.Visible = true;
   dataGridView1.Rows.AddRange(rows.ToArray());
   watch.Stop();
   MessageBox.Show(watch.ElapsedMilliseconds.ToString());
   }
   //add filer (improved)
   private void button4_Click(object sender, EventArgs e)
   {
   watch.Reset();
   watch.Start();
   List<DataGridViewRow> rows = new List<DataGridViewRow>();
   foreach (DataGridViewRow row in dataGridView1.Rows)
   {
   rows.Add(row);
   }
   dataGridView1.Rows.Clear();
   foreach (DataGridViewRow row in rows)
   {
   if (Convert.ToInt32(row.Cells[1].Value) % 2 != 0)
   {
   row.Visible = false;
   }
   }
   dataGridView1.Rows.AddRange(rows.ToArray());
   watch.Stop();
   MessageBox.Show(watch.ElapsedMilliseconds.ToString());
   }
   }