如何使DataGridViewLinkColumn下划线并更改背景颜色

Question

我有一个DataGridViewLinkColumn。如何将标题（row = -1）设为下划线并更改其背景颜色

var WarningsColumn = new DataGridViewLinkColumn
            {

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

Answer 1

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。

所以你可以把它设置为False然后覆盖默认值，然后你会得到像这样的（快速和脏测试以确保它有效）：

修改

要将样式应用于单个列，请使用此（您需要将其放在设置DataSource的{​​{1}}的代码之后：

DataGridView

Answer 2

我认为您必须将自定义代码添加到CellPainting事件处理程序中，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;
    }

它看起来不太好但它可以帮助你开始，我认为默认背景更好。如果是这样，您只需致电：e.PaintBackground(e.CellBounds, true);

更新

自定义绘画应该应用于DoubleBuffered控件。所以我认为你应该像这样创建自己的自定义DataGridView（它只是一些代码）：

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