DrawListViewColumnHeaderEventArgs.DrawBackground Méthode

Définition

Espace de noms:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Dessine l'arrière-plan de l'en-tête de colonne.

public:
 void DrawBackground();

public void DrawBackground ();

member this.DrawBackground : unit -> unit

Public Sub DrawBackground ()

Exemples

L’exemple de code suivant montre comment utiliser la DrawBackground propriété dans une application qui fournit un dessin personnalisé pour un ListView contrôle.

Pour obtenir l’exemple complet, consultez la rubrique de référence de vue d’ensemble DrawListViewColumnHeaderEventArgs .

// Draws column headers.
private void listView1_DrawColumnHeader(object sender,
    DrawListViewColumnHeaderEventArgs e)
{
    using (StringFormat sf = new StringFormat())
    {
        // Store the column text alignment, letting it default
        // to Left if it has not been set to Center or Right.
        switch (e.Header.TextAlign)
        {
            case HorizontalAlignment.Center:
                sf.Alignment = StringAlignment.Center;
                break;
            case HorizontalAlignment.Right:
                sf.Alignment = StringAlignment.Far;
                break;
        }

        // Draw the standard header background.
        e.DrawBackground();

        // Draw the header text.
        using (Font headerFont =
                    new Font("Helvetica", 10, FontStyle.Bold))
        {
            e.Graphics.DrawString(e.Header.Text, headerFont,
                Brushes.Black, e.Bounds, sf);
        }
    }
    return;
}

' Draws column headers.
Private Sub listView1_DrawColumnHeader(ByVal sender As Object, _
    ByVal e As DrawListViewColumnHeaderEventArgs) _
    Handles listView1.DrawColumnHeader

    Dim sf As New StringFormat()
    Try

        ' Store the column text alignment, letting it default
        ' to Left if it has not been set to Center or Right.
        Select Case e.Header.TextAlign
            Case HorizontalAlignment.Center
                sf.Alignment = StringAlignment.Center
            Case HorizontalAlignment.Right
                sf.Alignment = StringAlignment.Far
        End Select

        ' Draw the standard header background.
        e.DrawBackground()

        ' Draw the header text.
        Dim headerFont As New Font("Helvetica", 10, FontStyle.Bold)
        Try
            e.Graphics.DrawString(e.Header.Text, headerFont, _
                Brushes.Black, e.Bounds, sf)
        Finally
            headerFont.Dispose()
        End Try

    Finally
        sf.Dispose()
    End Try

End Sub

Remarques

Utilisez cette méthode pour dessiner l’arrière-plan standard de l’en-tête de colonne.

Voir aussi

• ListView
• OwnerDraw
• DrawColumnHeader