BindingSource.Count Propriété

Définition

Espace de noms:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

BindingSource.cs

Obtient le nombre total d’éléments de la liste sous-jacente, en tenant compte de la valeur actuelle Filter .

public:
 virtual property int Count { int get(); };

[System.ComponentModel.Browsable(false)]
public virtual int Count { get; }

[<System.ComponentModel.Browsable(false)>]
member this.Count : int

Public Overridable ReadOnly Property Count As Integer

Valeur de propriété

Int32

Nombre total d’éléments filtrés dans la liste sous-jacente.

Implémente

Count

Attributs

BrowsableAttribute

Exemples

L’exemple de code suivant illustre les membres RemoveAtet Count les Listmembres. Pour exécuter cet exemple, collez le code dans un formulaire qui contient un BindingSource nom BindingSource1, deux étiquettes nommées label1 et label2un bouton nommé button1. Associez la button1_Click méthode à l’événement Click pour button1. Les utilisateurs Visual Basic devront ajouter une référence à 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

La Count propriété obtient le nombre d’éléments de la liste sous-jacente représentée par la List propriété telle que modifiée par la valeur de la Filter propriété.

Voir aussi

• List
• Position
• Current