如何使DataGridViewLinkColumn加下划线并更改背景颜色

Question

我可以将标题( DataGridViewLinkColumn.How = -1)设置为下划线并更改其背景颜色吗

var WarningsColumn = new DataGridViewLinkColumn
            {

                Name = @"Warnings",
                HeaderText = @"Warnings",
                DataPropertyName = @"WarningsCount",
                AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells,               
                ReadOnly = true
            };

Answer 1

我认为您必须向CellPainting事件处理程序添加自定义代码，如下所示：

 Point spot;
 private void dataGridView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
    {
        if (e.RowIndex == -1 && e.ColumnIndex > -1)
        {
            e.Handled = true;
            if (e.CellBounds.Contains(spot))//Mouse over cell
            {
                PaintCellBackground(e.Graphics, Color.Red, e.CellBounds);
            }
            else //Mouse leave cell
            {
                PaintCellBackground(e.Graphics, Color.Green, e.CellBounds);
            }
            StringFormat sf = new StringFormat(){Alignment=StringAlignment.Center, LineAlignment = StringAlignment.Center };
            Font f = new Font(e.CellStyle.Font, FontStyle.Underline);
            e.Graphics.DrawString(e.Value.ToString(), f, new SolidBrush(e.CellStyle.ForeColor), e.CellBounds, sf);
        }
    } 
 private void PaintCellBackground(Graphics g, Color c, Rectangle rect)
    {
        Rectangle topHalf = new Rectangle(rect.Left, rect.Top, rect.Width, rect.Height / 2);
        Rectangle bottomHalf = new Rectangle(rect.Left, topHalf.Bottom, rect.Width, topHalf.Height);
        g.FillRectangle(new SolidBrush(Color.FromArgb(150, c)), topHalf);
        g.FillRectangle(new SolidBrush(c), bottomHalf);
        ControlPaint.DrawBorder(g, rect, Color.Gray, 1, ButtonBorderStyle.Solid, 
                                         Color.Gray, 0, ButtonBorderStyle.Solid, 
                                         Color.Gray, 1, ButtonBorderStyle.Solid, 
                                         Color.Gray, 0, ButtonBorderStyle.Solid);
    }
    //Reset spot when mouse leave
    private void dataGridView_MouseLeave(object sender, EventArgs e)
    {
        spot = Point.Empty;
    }
    //Update spot when mouse move 
    private void dataGridView_MouseMove(object sender, MouseEventArgs e)
    {
        spot = e.Location;
    }

它看起来不好，但它可以帮助你开始，我认为默认的背景更好。如果是这样，您只需调用：e.PaintBackground(e.CellBounds, true);

更新

自定义绘画应应用于DoubleBuffered控件。所以我认为你应该像这样创建你自己的自定义DataGridView (这只是更多一点的代码)：

public class CustomDataGridView : DataGridView {
    public CustomDataGridView(){
       DoubleBuffered = true;
    }
}

Answer 2

试试这个：

dataGridView1.EnableHeadersVisualStyles = false;

dataGridView1.ColumnHeadersDefaultCellStyle
    = new DataGridViewCellStyle {BackColor = Color.Yellow, Font = new Font(dataGridView1.Font, FontStyle.Underline)};

来自DataGridView.ColumnHeadersDefaultCellStyle Property上的MSDN参考

如果启用了视觉样式并且EnableHeadersVisualStyles设置为true，则使用当前主题绘制除TopLeftHeaderCell之外的所有标题单元格，并忽略ColumnHeadersDefaultCellStyle值。

因此，您可以将其设置为False，然后覆盖默认设置，然后您将得到如下所示的结果(快速测试以确保其正常工作)

​

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编辑：

要将样式应用于单个列，请改用以下代码(您需要将此代码放在设置DataGridView__的DataSource的代码后面)：

dataGridView1.Columns["your_column_name"].HeaderCell.Style
    = new DataGridViewCellStyle { BackColor = Color.Yellow, Font = new Font(dataGridView1.Font, FontStyle.Underline) };

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