.NET Framework Class Library
BindingSource..::.Position Property

Gets or sets the index of the current item in the underlying list.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
Syntax

Visual Basic (Declaration)
<BrowsableAttribute(False)> _
Public Property Position As Integer
Visual Basic (Usage)
Dim instance As BindingSource
Dim value As Integer

value = instance.Position

instance.Position = value
C#
[BrowsableAttribute(false)]
public int Position { get; set; }
Visual C++
[BrowsableAttribute(false)]
public:
property int Position {
    int get ();
    void set (int value);
}
JScript
public function get Position () : int
public function set Position (value : int)

Property Value

Type: System..::.Int32
A zero-based index that specifies the position of the current item in the underlying list.
Remarks

When setting the Position property, out-of-range values are treated in the following manner:

  • Negative values are treated as 0.

  • Values greater than or equal to Count are treated as Count minus 1.

Changing the Position property will adjust the Current property likewise.

Examples

The following code example demonstrates the MoveNext, MoveFirst, Current, and Position members. 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. 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. Visual Basic users will need to add a reference to System.Data.dll.

Visual Basic
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

C#
        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);
        }
Visual C++
    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);
        }
    }

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0
See Also

Reference

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