BindingSource.Count BindingSource.Count BindingSource.Count BindingSource.Count Property

Définition

Obtient le nombre total d'éléments de la liste sous-jacente, en prenant la valeur Filter actuelle en considération.Gets the total number of items in the underlying list, taking the current Filter value into consideration.

public:
 virtual property int Count { int get(); };
[System.ComponentModel.Browsable(false)]
public virtual int Count { get; }
member this.Count : int
Public Overridable ReadOnly Property Count As Integer

Valeur de propriété

Nombre total d'éléments filtrés figurant dans la liste sous-jacente.The total number of filtered items in the underlying list.

Implémente

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

La Count propriété obtient le nombre d’éléments dans la liste sous-jacente représentée List par la propriété telle qu’elle a été Filter modifiée par la valeur de la propriété.The Count property gets the number of items in the underlying list represented by the List property as modified by the value of the Filter property.

S’applique à

Voir aussi