BindingSource.Count Propiedad

Definición

Obtiene el número total de elementos en la lista subyacente, teniendo el valor Filter actual en cuenta.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

Valor de propiedad

Número de elementos contenidos en la lista subyacente.The total number of filtered items in the underlying list.

Implementaciones

Atributos

Ejemplos

En el ejemplo de código siguiente Listse RemoveAtmuestran los Count miembros, y.The following code example demonstrates the List, RemoveAt, and Count members. Para ejecutar este ejemplo, pegue el código en un formulario que contenga BindingSource un BindingSource1denominado, dos etiquetas label1 denominadas y label2, y un button1botón denominado.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. Asocie el button1_Click método con el Click evento para button1.Associate the button1_Click method with the Click event for button1. Visual Basic los usuarios tendrán que agregar una referencia a 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

Comentarios

La Count propiedad obtiene el número de elementos de la lista subyacente representado por la List propiedad tal y como lo ha modificado el Filter valor de la propiedad.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.

Se aplica a

Consulte también: