BindingSource.RemoveAt(Int32) Methode

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)

Parameter

Implementiert

Ausnahmen

Beispiele

Das folgende Codebeispiel veranschaulicht die ListElemente , RemoveAtund Count die Elemente. Zum Ausführen dieses Beispiels fügen Sie den Code in ein Formular ein, das eine benannte BindingSourceBindingSource1, zwei Bezeichnungen mit namen label1 und label2eine Schaltfläche mit dem Namen button1enthält. Ordnen Sie die button1_Click Methode dem Click Ereignis für button1. Visual Basic-Benutzer müssen einen Verweis auf System.Data.dllhinzufügen.

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

Hinweise

Diese beiden Bedingungen können mit den bzwIsFixedSize. eigenschaften IsReadOnly getestet werden.

Diese Methode löst das ListChanged Ereignis aus.

Weitere Informationen

• RemoveCurrent()
• Remove(Object)
• List
• IsFixedSize
• IsReadOnly
• IndexOf(Object)
• Insert(Int32, Object)
• Add(Object)
• AddNew()