DrawListViewSubItemEventArgs.SubItem Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

ListViewItem.ListViewSubItem Mendapatkan untuk menggambar.

public:
 property System::Windows::Forms::ListViewItem::ListViewSubItem ^ SubItem { System::Windows::Forms::ListViewItem::ListViewSubItem ^ get(); };

public System.Windows.Forms.ListViewItem.ListViewSubItem? SubItem { get; }

member this.SubItem : System.Windows.Forms.ListViewItem.ListViewSubItem

Public ReadOnly Property SubItem As ListViewItem.ListViewSubItem

Nilai Properti

ListViewItem.ListViewSubItem

Untuk ListViewItem.ListViewSubItem menggambar.

Contoh

Contoh kode berikut menunjukkan cara menggunakan SubItem properti dalam aplikasi yang menyediakan gambar kustom untuk ListView kontrol. Dalam contoh, handler untuk ListView.DrawSubItem peristiwa menggambar nilai teks subitem dan teks dan latar belakang untuk subitem yang memiliki nilai negatif.

Untuk contoh lengkapnya, lihat DrawListViewSubItemEventArgs topik referensi gambaran umum.

// Draws subitem text and applies content-based formatting.
private void listView1_DrawSubItem(object sender,
    DrawListViewSubItemEventArgs e)
{
    TextFormatFlags flags = TextFormatFlags.Left;

    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;
                flags = TextFormatFlags.HorizontalCenter;
                break;
            case HorizontalAlignment.Right:
                sf.Alignment = StringAlignment.Far;
                flags = TextFormatFlags.Right;
                break;
        }

        // Draw the text and background for a subitem with a 
        // negative value. 
        double subItemValue;
        if (e.ColumnIndex > 0 && Double.TryParse(
            e.SubItem.Text, NumberStyles.Currency,
            NumberFormatInfo.CurrentInfo, out subItemValue) &&
            subItemValue < 0)
        {
            // Unless the item is selected, draw the standard 
            // background to make it stand out from the gradient.
            if ((e.ItemState & ListViewItemStates.Selected) == 0)
            {
                e.DrawBackground();
            }

            // Draw the subitem text in red to highlight it. 
            e.Graphics.DrawString(e.SubItem.Text,
                listView1.Font, Brushes.Red, e.Bounds, sf);

            return;
        }

        // Draw normal text for a subitem with a nonnegative 
        // or nonnumerical value.
        e.DrawText(flags);
    }
}

' Draws subitem text and applies content-based formatting.
Private Sub listView1_DrawSubItem(ByVal sender As Object, _
    ByVal e As DrawListViewSubItemEventArgs) _
    Handles listView1.DrawSubItem

    Dim flags As TextFormatFlags = TextFormatFlags.Left

    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
                flags = TextFormatFlags.HorizontalCenter
            Case HorizontalAlignment.Right
                sf.Alignment = StringAlignment.Far
                flags = TextFormatFlags.Right
        End Select

        ' Draw the text and background for a subitem with a 
        ' negative value. 
        Dim subItemValue As Double
        If e.ColumnIndex > 0 AndAlso _
            Double.TryParse(e.SubItem.Text, NumberStyles.Currency, _
            NumberFormatInfo.CurrentInfo, subItemValue) AndAlso _
            subItemValue < 0 Then

            ' Unless the item is selected, draw the standard 
            ' background to make it stand out from the gradient.
            If (e.ItemState And ListViewItemStates.Selected) = 0 Then
                e.DrawBackground()
            End If

            ' Draw the subitem text in red to highlight it. 
            e.Graphics.DrawString(e.SubItem.Text, _
                Me.listView1.Font, Brushes.Red, e.Bounds, sf)

            Return

        End If

        ' Draw normal text for a subitem with a nonnegative 
        ' or nonnumerical value.
        e.DrawText(flags)

    Finally
        sf.Dispose()
    End Try

End Sub

Keterangan

Metode ini berguna ketika properti lain DrawListViewSubItemEventArgs tidak memberikan informasi yang memadai untuk memenuhi kebutuhan Anda. Properti SubItem memungkinkan Anda mengakses semua anggota yang ListViewItem.ListViewSubItem digambar. Anda harus mengakses objek ini secara langsung, misalnya, untuk menggambar ListViewItem.ListViewSubItem.Text nilai sendiri daripada menggunakan DrawText metode .

Lihat juga

• ListView
• DrawSubItem
• OwnerDraw
• ListViewItem.ListViewSubItem
• Item