DataGridView.RowPrePaint 事件

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

發生在繪製 DataGridViewRow 之前。

public:
 event System::Windows::Forms::DataGridViewRowPrePaintEventHandler ^ RowPrePaint;

public event System.Windows.Forms.DataGridViewRowPrePaintEventHandler RowPrePaint;

member this.RowPrePaint : System.Windows.Forms.DataGridViewRowPrePaintEventHandler 

Public Custom Event RowPrePaint As DataGridViewRowPrePaintEventHandler 

事件類型

DataGridViewRowPrePaintEventHandler

範例

下列程式碼範例示範如何在選取資料列時，使用 事件的處理常式 RowPrePaint 繪製漸層資料列背景。 此範例是How to： Customize the Appearance of Rows in the Windows Forms DataGridView Control中較大型範例的一部分。

// Paints the custom selection background for selected rows.
void dataGridView1_RowPrePaint(object sender,
        DataGridViewRowPrePaintEventArgs e)
{
    // Do not automatically paint the focus rectangle.
    e.PaintParts &= ~DataGridViewPaintParts.Focus;

    // Determine whether the cell should be painted
    // with the custom selection background.
    if ((e.State & DataGridViewElementStates.Selected) ==
                DataGridViewElementStates.Selected)
    {
        // Calculate the bounds of the row.
        Rectangle rowBounds = new Rectangle(
            this.dataGridView1.RowHeadersWidth, e.RowBounds.Top,
            this.dataGridView1.Columns.GetColumnsWidth(
                DataGridViewElementStates.Visible) -
            this.dataGridView1.HorizontalScrollingOffset + 1,
            e.RowBounds.Height);

        // Paint the custom selection background.
        using (Brush backbrush =
            new System.Drawing.Drawing2D.LinearGradientBrush(rowBounds,
                this.dataGridView1.DefaultCellStyle.SelectionBackColor,
                e.InheritedRowStyle.ForeColor,
                System.Drawing.Drawing2D.LinearGradientMode.Horizontal))
        {
            e.Graphics.FillRectangle(backbrush, rowBounds);
        }
    }
}

' Paints the custom selection background for selected rows.
Sub dataGridView1_RowPrePaint(ByVal sender As Object, _
    ByVal e As DataGridViewRowPrePaintEventArgs) _
    Handles dataGridView1.RowPrePaint

    ' Do not automatically paint the focus rectangle.
    e.PaintParts = e.PaintParts And Not DataGridViewPaintParts.Focus

    ' Determine whether the cell should be painted with the 
    ' custom selection background.
    If (e.State And DataGridViewElementStates.Selected) = _
        DataGridViewElementStates.Selected Then

        ' Calculate the bounds of the row.
        Dim rowBounds As New Rectangle( _
            Me.dataGridView1.RowHeadersWidth, e.RowBounds.Top, _
            Me.dataGridView1.Columns.GetColumnsWidth( _
            DataGridViewElementStates.Visible) - _
            Me.dataGridView1.HorizontalScrollingOffset + 1, _
            e.RowBounds.Height)

        ' Paint the custom selection background.
        Dim backbrush As New _
            System.Drawing.Drawing2D.LinearGradientBrush(rowBounds, _
            Me.dataGridView1.DefaultCellStyle.SelectionBackColor, _
            e.InheritedRowStyle.ForeColor, _
            System.Drawing.Drawing2D.LinearGradientMode.Horizontal)
        Try
            e.Graphics.FillRectangle(backbrush, rowBounds)
        Finally
            backbrush.Dispose()
        End Try
    End If

End Sub

備註

您可以單獨或結合 RowPostPaint 事件來處理此事件，以自訂 控制項中的資料列外觀。 您可以自行繪製整個資料列，或繪製資料列的特定部分，並使用 類別的 DataGridViewRowPrePaintEventArgs 下列方法來繪製其他部分：

• DrawFocus

• PaintCells

• PaintCellsBackground

• PaintCellsContent

• PaintHeader

您也可以使用 VisualStyleRenderer 類別，使用目前的主題繪製標準控制項。 如需詳細資訊，請參閱 使用視覺化樣式轉譯控制項。 如果您使用 Visual Studio 2005，您也可以存取可與 控制項搭配 DataGridView 使用的大型標準映射庫。

如需如何處理事件的詳細資訊，請參閱 處理和引發事件。

另請參閱

• DataGridView 控制項 (Windows Form)