BindingSource.MoveNext Methode
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Wechselt zum nächsten Element in der Liste.
public:
void MoveNext();
public void MoveNext ();
member this.MoveNext : unit -> unit
Public Sub MoveNext ()
Beispiele
Im folgenden Codebeispiel werden die MoveNextMember , MoveFirst, Currentund Position veranschaulicht. Fügen Sie zum Ausführen dieses Beispiels den Code in ein Formular ein, das den System.Drawing.Drawing2D Namespace importiert und eine BindingSource benannte BindingSource1
und eine Schaltfläche mit dem Namen button1
enthält. Ordnen Sie die Form1_Load
Methoden und Form1_Paint
den Load Ereignissen und Paint für das Formular zu, und ordnen Sie die button1_click
-Methode dem Click -Ereignis für button1
zu. Visual Basic-Benutzer müssen einen Verweis auf System.Data.dll hinzufügen.
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
Hinweise
Ändert den aktuellen Wert der Position Eigenschaft in das nächste Element in der zugrunde liegenden Datenquelle.