ListView.Clear ListView.Clear ListView.Clear ListView.Clear Method

Définition

Supprime tous les éléments et les colonnes du contrôle.Removes all items and columns from the control.

public:
 void Clear();
public void Clear ();
member this.Clear : unit -> unit
Public Sub Clear ()

Exemples

L’exemple de code suivant illustre l’utilisation de Clear et ListViewItem.Selected membres.The following code example demonstrates the use of Clear and ListViewItem.Selected members. Pour exécuter cet exemple, collez le code suivant dans un formulaire qui contient un ListView nommé ListView1 et un bouton situé au bas du formulaire, nommé Button1.To run this example, paste the following code into a form that contains a ListView named ListView1 and a button, located toward the bottom of the form, named Button1. Appelez le InitializeListView méthode à partir du constructeur du formulaire ou Load (méthode).Call the InitializeListView method from the form's constructor or Load method.

private:
   void InitializeListView()
   {
      // Set up the inital values for the ListView and populate it.
      this->ListView1 = gcnew ListView;
      this->ListView1->Dock = DockStyle::Top;
      this->ListView1->Location = System::Drawing::Point( 0, 0 );
      this->ListView1->Size = System::Drawing::Size( 292, 130 );
      this->ListView1->View = View::Details;
      this->ListView1->FullRowSelect = true;
      array<String^>^breakfast = {"Continental Breakfast","Pancakes and Sausage","Denver Omelet","Eggs & Bacon","Bagel & Cream Cheese"};
      array<String^>^breakfastPrices = {"3.09","4.09","4.19","4.79","2.09"};
      PopulateMenu( "Breakfast", breakfast, breakfastPrices );
   }

   void PopulateMenu( String^ meal, array<String^>^menuItems, array<String^>^menuPrices )
   {
      ColumnHeader^ columnHeader1 = gcnew ColumnHeader;
      columnHeader1->Text = String::Concat( meal, " Choices" );
      columnHeader1->TextAlign = HorizontalAlignment::Left;
      columnHeader1->Width = 146;
      ColumnHeader^ columnHeader2 = gcnew ColumnHeader;
      columnHeader2->Text = "Price";
      columnHeader2->TextAlign = HorizontalAlignment::Center;
      columnHeader2->Width = 142;
      this->ListView1->Columns->Add( columnHeader1 );
      this->ListView1->Columns->Add( columnHeader2 );
      for ( int count = 0; count < menuItems->Length; count++ )
      {
         ListViewItem^ listItem = gcnew ListViewItem( menuItems[ count ] );
         listItem->SubItems->Add( menuPrices[ count ] );
         ListView1->Items->Add( listItem );

      }
      
      // Use the Selected property to select the first item on 
      // the list.
      ListView1->Focus();
      ListView1->Items[ 0 ]->Selected = true;
   }

   void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      // Create new values for the ListView, clear the list, 
      // and repopulate it.
      array<String^>^lunch = {"Hamburger","Grilled Cheese","Soup & Salad","Club Sandwich","Hotdog"};
      array<String^>^lunchPrices = {"4.09","5.09","5.19","4.79","2.09"};
      ListView1->Clear();
      PopulateMenu( "Lunch", lunch, lunchPrices );
      Button1->Enabled = false;
   }
private void InitializeListView()
{
	// Set up the inital values for the ListView and populate it.
	this.ListView1 = new ListView();
	this.ListView1.Dock = DockStyle.Top;
	this.ListView1.Location = new System.Drawing.Point(0, 0);
	this.ListView1.Size = new System.Drawing.Size(292, 130);
	this.ListView1.View = View.Details;
	this.ListView1.FullRowSelect = true;

	string[] breakfast = new string[]{"Continental Breakfast", 
		"Pancakes and Sausage", "Denver Omelet", "Eggs & Bacon", 
		"Bagel & Cream Cheese"};

	string[] breakfastPrices = new string[]{"3.09", "4.09", 
		"4.19", "4.79", "2.09"};

	PopulateMenu("Breakfast", breakfast, breakfastPrices);
}

private void PopulateMenu(string meal, 
	string[] menuItems, string[] menuPrices)
{
	ColumnHeader columnHeader1 = new ColumnHeader();
	columnHeader1.Text = meal + " Choices";
	columnHeader1.TextAlign = HorizontalAlignment.Left;
	columnHeader1.Width = 146;

	ColumnHeader columnHeader2 = new ColumnHeader();
	columnHeader2.Text = "Price";
	columnHeader2.TextAlign = HorizontalAlignment.Center;
	columnHeader2.Width = 142;

	this.ListView1.Columns.Add(columnHeader1);
	this.ListView1.Columns.Add(columnHeader2);

	for(int count=0; count < menuItems.Length; count++)
	{
		ListViewItem listItem = 
			new ListViewItem(menuItems[count]);
		listItem.SubItems.Add(menuPrices[count]);
		ListView1.Items.Add(listItem);
	}

	// Use the Selected property to select the first item on 
	// the list.
	ListView1.Focus();
	ListView1.Items[0].Selected = true;
}


private void Button1_Click(System.Object sender, System.EventArgs e)
{
	// Create new values for the ListView, clear the list, 
	// and repopulate it.
	string[] lunch = new string[]{"Hamburger", "Grilled Cheese",
		"Soup & Salad", "Club Sandwich", "Hotdog"};

	string[] lunchPrices = new string[]{"4.09", "5.09", "5.19", 
		"4.79", "2.09"};

	ListView1.Clear();

	PopulateMenu("Lunch", lunch, lunchPrices);
	Button1.Enabled = false;
}
Private Sub InitializeListView()

    ' Set up the inital values for the ListView and populate it.
    Me.ListView1 = New ListView
    Me.ListView1.Dock = DockStyle.Top
    Me.ListView1.Location = New System.Drawing.Point(0, 0)
    Me.ListView1.Size = New System.Drawing.Size(292, 130)
    Me.ListView1.View = View.Details
    Me.ListView1.FullRowSelect = True

    Dim breakfast() As String = New String() {"Continental Breakfast", "Pancakes and Sausage", _
   "Denver Omelet", "Eggs & Bacon", "Bagel & Cream Cheese"}

    Dim breakfastPrices() As String = New String() {"3.09", "4.09", "4.19", _
       "4.79", "2.09"}

    PopulateMenu("Breakfast", breakfast, breakfastPrices)
End Sub

Private Sub PopulateMenu(ByVal meal As String, _
    ByVal menuItems() As String, ByVal menuPrices() As String)
    Dim columnHeader1 As New ColumnHeader
    With columnHeader1
        .Text = meal & " Choices"
        .TextAlign = HorizontalAlignment.Left
        .Width = 146
    End With
    Dim columnHeader2 As New ColumnHeader
    With columnHeader2
        .Text = "Price"
        .TextAlign = HorizontalAlignment.Center
        .Width = 142
    End With
    Me.ListView1.Columns.Add(columnHeader1)
    Me.ListView1.Columns.Add(columnHeader2)

    Dim count As Integer

    For count = 0 To menuItems.Length - 1
        Dim listItem As New ListViewItem(menuItems(count))
        listItem.SubItems.Add(menuPrices(count))
        ListView1.Items.Add(listItem)
    Next

    ' Use the Selected property to select the first item on 
    ' the list.
    ListView1.Focus()
    ListView1.Items(0).Selected = True
End Sub


Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    ' Create new values for the ListView, clear the list, 
    ' and repopulate it.
    Dim lunch() As String = New String() {"Hamburger", _ 
        "Grilled Cheese", "Soup & Salad", "Club Sandwich", "Hotdog"}

    Dim lunchPrices() As String = New String() {"4.09", "5.09", _
        "5.19", "4.79", "2.09"}

    ListView1.Clear()

    PopulateMenu("Lunch", lunch, lunchPrices)
    Button1.Enabled = False
End Sub

Remarques

Vous pouvez utiliser cette méthode pour supprimer tous les éléments et les colonnes à partir de la ListView contrôle sans devoir appeler l’individu Clear méthodes à partir de la ListView.ColumnHeaderCollection et ListView.ListViewItemCollection classes.You can use this method to remove all items and columns from the ListView control without having to call the individual Clear methods from the ListView.ColumnHeaderCollection and ListView.ListViewItemCollection classes.

Notes

Le Clear méthode n’efface pas Groups spécifié pour le ListView contrôle.The Clear method does not clear Groups specified for the ListView control. Pour effacer Groups appeler ListViewGroupCollection.Clear.To clear Groups call ListViewGroupCollection.Clear.

S’applique à

Voir aussi