BindingSource.RemoveAt(Int32) BindingSource.RemoveAt(Int32) BindingSource.RemoveAt(Int32) BindingSource.RemoveAt(Int32) Method

Définition

Supprime l'élément au niveau de l'index spécifié dans la liste.Removes the item at the specified index in the list.

public:
 virtual void RemoveAt(int index);
public virtual void RemoveAt (int index);
abstract member RemoveAt : int -> unit
override this.RemoveAt : int -> unit
Public Overridable Sub RemoveAt (index As Integer)

Paramètres

index
Int32 Int32 Int32 Int32

Index de base zéro de l'élément à supprimer.The zero-based index of the item to remove.

Implémente

Exceptions

index est inférieur à zéro ou supérieur à la valeur de la propriété Count.index is less than zero or greater than the value of the Count property.

La liste sous-jacente représentée par la propriété List est en lecture seule ou a une taille fixe.The underlying list represented by the List property is read-only or has a fixed size.

Exemples

L’exemple de code suivant illustre Listles RemoveAtmembres, Count et.The following code example demonstrates the List, RemoveAt, and Count members. Pour exécuter cet exemple, collez le code dans un formulaire qui contient BindingSource un BindingSource1nommé, deux étiquettes label1 nommées et label2, et un button1bouton nommé.To run this example, paste the code into a form that contains a BindingSource named BindingSource1, two labels named label1 and label2, and a button named button1. Associez button1_Click la méthode à Click l’événement button1pour.Associate the button1_Click method with the Click event for button1. Visual Basic utilisateurs devront ajouter une référence à System. Data. dll.Visual Basic users will need to add a reference to System.Data.dll.

private void button1_Click(object sender, EventArgs e)
{
    // Create the connection string, data adapter and data table.
    SqlConnection connectionString =
         new SqlConnection("Initial Catalog=Northwind;" +
         "Data Source=localhost;Integrated Security=SSPI;");
    SqlDataAdapter customersTableAdapter =
        new SqlDataAdapter("Select * from Customers", connectionString);
    DataTable customerTable = new DataTable();

    // Fill the adapter with the contents of the customer table.
    customersTableAdapter.Fill(customerTable);

    // Set data source for BindingSource1.
    BindingSource1.DataSource = customerTable;

    // Set the label text to the number of items in the collection before
    // an item is removed.
    label1.Text = "Starting count: " + BindingSource1.Count.ToString();

    // Access the List property and remove an item.
    BindingSource1.List.RemoveAt(4);

    // Remove an item directly from the BindingSource. 
    // This is equivalent to the previous line of code.
    BindingSource1.RemoveAt(4);

    // Show the new count.
    label2.Text = "Count after removal: " + BindingSource1.Count.ToString();
}
    Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) _
        Handles button1.Click

        ' Create the connection string, data adapter and data table.
        Dim connectionString As New SqlConnection("Initial Catalog=Northwind;" & _
            "Data Source=localhost;Integrated Security=SSPI;")
        Dim customersTableAdapter As New SqlDataAdapter("Select * from Customers", _
            connectionString)
        Dim customerTable As New DataTable()

        ' Fill the adapter with the contents of the customer table.
        customersTableAdapter.Fill(customerTable)

        ' Set data source for BindingSource1.
        BindingSource1.DataSource = customerTable

        ' Set the label text to the number of items in the collection before
        ' an item is removed.
        label1.Text = "Starting count: " + BindingSource1.Count.ToString()

        ' Access the List property and remove an item.
        BindingSource1.List.RemoveAt(4)

        ' Remove an item directly from the BindingSource. 
        ' This is equivalent to the previous line of code.
        BindingSource1.RemoveAt(4)

        ' Show the new count.
        label2.Text = "Count after removal: " + BindingSource1.Count.ToString()

    End Sub
End Class

Remarques

Ces deux conditions peuvent être testées avec IsFixedSize les IsReadOnly propriétés et, respectivement.These two conditions can be tested with the IsFixedSize and IsReadOnly properties, respectively.

Cette méthode déclenche l' ListChanged événement.This method raises the ListChanged event.

S’applique à

Voir aussi