共用方式為


DrawListViewSubItemEventArgs.SubItem 屬性

定義

取得要繪製的 ListViewItem.ListViewSubItem

public:
 property System::Windows::Forms::ListViewItem::ListViewSubItem ^ SubItem { System::Windows::Forms::ListViewItem::ListViewSubItem ^ get(); };
public System.Windows.Forms.ListViewItem.ListViewSubItem SubItem { get; }
public System.Windows.Forms.ListViewItem.ListViewSubItem? SubItem { get; }
member this.SubItem : System.Windows.Forms.ListViewItem.ListViewSubItem
Public ReadOnly Property SubItem As ListViewItem.ListViewSubItem

屬性值

要繪製的 ListViewItem.ListViewSubItem

範例

下列程式碼範例示範如何在應用程式中使用 SubItem 屬性,以提供控制項的自訂繪圖 ListView 。 在此範例中 ListView.DrawSubItem ,事件的處理常式會繪製子專案文字值,以及具有負值的子專案的文字和背景。

如需完整的範例,請參閱 DrawListViewSubItemEventArgs 概觀參考主題。

// 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

備註

當其他 DrawListViewSubItemEventArgs 屬性未提供足夠的資訊以符合您的需求時,這個方法會很有用。 屬性 SubItem 可讓您存取所繪製的所有 ListViewItem.ListViewSubItem 成員。 例如,您必須直接存取這個物件,以自行繪製 ListViewItem.ListViewSubItem.Text 值,而不是使用 DrawText 方法。

適用於

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