BindingSource.Position BindingSource.Position BindingSource.Position BindingSource.Position Property

Definición

Obtiene o establece el índice del elemento actual de la lista subyacente.Gets or sets the index of the current item in the underlying list.

public:
 property int Position { int get(); void set(int value); };
[System.ComponentModel.Browsable(false)]
public int Position { get; set; }
member this.Position : int with get, set
Public Property Position As Integer

Valor de propiedad

Un índice de base cero que especifica la posición del elemento actual en la lista subyacente.A zero-based index that specifies the position of the current item in the underlying list.

Ejemplos

En el ejemplo de código siguiente se muestra el MoveNext, MoveFirst, Current, y Position miembros.The following code example demonstrates the MoveNext, MoveFirst, Current, and Position members. Para ejecutar este ejemplo, pegue el código en un formulario que importa el System.Drawing.Drawing2D espacio de nombres y contiene un BindingSource denominado BindingSource1 y un botón denominado button1.To run this example, paste the code into a form that imports the System.Drawing.Drawing2D namespace and contains a BindingSource named BindingSource1 and a button named button1. Asociar el Form1_Load y Form1_Paint métodos con el Load y Paint eventos para el formulario y asocie el button1_click método con el Click eventos para button1.Associate the Form1_Load and Form1_Paint methods with the Load and Paint events for the form, and associate the button1_click method with the Click event for button1. Los usuarios de Visual Basic deberá agregar una referencia a System.Data.dll.Visual Basic users will need to add a reference to System.Data.dll.

    void Form1_Load(Object^ sender, EventArgs^ e)
    {
        // Set the data source to the Brush type and populate
        // bindingSource1; with some brushes.
        bindingSource1->DataSource = System::Drawing::Brush::typeid;
        bindingSource1->Add(
            gcnew TextureBrush(gcnew Bitmap(Button::typeid, "Button.bmp")));
        bindingSource1->Add(gcnew HatchBrush(HatchStyle::Cross, Color::Red));
        bindingSource1->Add(gcnew SolidBrush(Color::Blue));
    }


private:
    void moveNextButton_Click(Object^ sender, EventArgs^ e)
    {
        // If you are not at the end of the list, move to the next item
        // in the BindingSource.
        if (bindingSource1->Position + 1 < bindingSource1->Count)
        {
            bindingSource1->MoveNext();
        }
        // Otherwise, move back to the first item.
        else
        {
            bindingSource1->MoveFirst();
        }
        // Force the form to repaint.
        this->Invalidate();
    }

    void Form1_Paint(Object^ sender, PaintEventArgs^ e)
    {
        // Get the current item in the BindingSource.
        Brush^ item = (Brush^) bindingSource1->Current;

        // If the current type is a TextureBrush, fill an ellipse.
        if (item->GetType() == TextureBrush::typeid)
        {
            e->Graphics->FillEllipse(item,e->ClipRectangle);
        }
        // If the current type is a HatchBrush, fill a triangle.
        else if (item->GetType() == HatchBrush::typeid)
        {

            e->Graphics->FillPolygon(item, 
                gcnew array<Point> {*gcnew Point(0, 0),
                *gcnew Point(0, 200),
                *gcnew Point(200, 0)});
        }
        // Otherwise, fill a rectangle.
        else
        {
            e->Graphics->FillRectangle(
                (Brush^)bindingSource1->Current, e->ClipRectangle);
        }
    }

void Form1_Load(object sender, EventArgs e)
{
	// Set the data source to the Brush type and populate
	// BindingSource1 with some brushes.
	BindingSource1.DataSource = typeof(System.Drawing.Brush);
	BindingSource1.Add(
		new TextureBrush(new Bitmap(typeof(Button), "Button.bmp")));
	BindingSource1.Add(new HatchBrush(HatchStyle.Cross, Color.Red));
	BindingSource1.Add(new SolidBrush(Color.Blue));
}


private void button1_Click(object sender, EventArgs e)
{
	// If you are not at the end of the list, move to the next item
	// in the BindingSource.
	if (BindingSource1.Position + 1 < BindingSource1.Count)
		BindingSource1.MoveNext();

	// Otherwise, move back to the first item.
	else
		BindingSource1.MoveFirst();

	// Force the form to repaint.
	this.Invalidate();
}

void Form1_Paint(object sender, PaintEventArgs e)
{
	// Get the current item in the BindingSource.
	Brush item = (Brush)BindingSource1.Current;

	// If the current type is a TextureBrush, fill an ellipse.
	if (item.GetType() == typeof(TextureBrush))
		e.Graphics.FillEllipse(item,
		   e.ClipRectangle);

	// If the current type is a HatchBrush, fill a triangle.
	else if (item.GetType() == typeof(HatchBrush))
		e.Graphics.FillPolygon(item,
			new Point[] { new Point(0, 0), new Point(0, 200),
                  new Point(200, 0)});

	// Otherwise, fill a rectangle.
	else
		e.Graphics.FillRectangle(
			(Brush)BindingSource1.Current, e.ClipRectangle);
}
Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _
    Handles Me.Load

    ' Set the data source to the Brush type and populate
    ' BindingSource1 with some brushes.
    BindingSource1.DataSource = GetType(System.Drawing.Brush)
    BindingSource1.Add(New TextureBrush(New Bitmap(GetType(Button), _
        "Button.bmp")))
    BindingSource1.Add(New HatchBrush(HatchStyle.Cross, Color.Red))
    BindingSource1.Add(New SolidBrush(Color.Blue))

End Sub



Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) _
     Handles button1.Click

    ' If you are not at the end of the list, move to the next item
    ' in the BindingSource.
    If BindingSource1.Position + 1 < BindingSource1.Count Then
        BindingSource1.MoveNext()

        ' Otherwise, move back to the first item.
    Else
        BindingSource1.MoveFirst()
    End If

    ' Force the form to repaint.
    Me.Invalidate()

End Sub


Sub Form1_Paint(ByVal sender As Object, ByVal e As PaintEventArgs)

    ' Get the current item in the BindingSource.
    Dim item As Brush = CType(BindingSource1.Current, Brush)

    ' If the current type is a TextureBrush, fill an ellipse.
    If item.GetType().Equals(GetType(TextureBrush)) Then
        e.Graphics.FillEllipse(item, _
        e.ClipRectangle)

        ' If the current type is a HatchBrush, fill a triangle.
    ElseIf item.GetType().Equals(GetType(HatchBrush)) Then
        e.Graphics.FillPolygon(item, New Point() _
         {New Point(0, 0), New Point(0, 200), New Point(200, 0)})

        ' Otherwise, fill a rectangle.
    Else
        e.Graphics.FillRectangle(item, e.ClipRectangle)
    End If

End Sub

Comentarios

Al establecer el Position propiedad, se tratan los valores fuera del intervalo de la siguiente manera:When setting the Position property, out-of-range values are treated in the following manner:

  • Los valores negativos se tratan como 0.Negative values are treated as 0.

  • Valores mayores o iguales a Count se tratan como Count menos 1.Values greater than or equal to Count are treated as Count minus 1.

Cambiar el Position propiedad ajustará el Current propiedad del mismo modo.Changing the Position property will adjust the Current property likewise.

Se aplica a

Consulte también: