Question

任何人都可以帮我解决如何在DataGridView winform的C#中设置特定标题单元格边框颜色的问题。

我在DataGridView winform中有一个C#，我的要求是当我们点击标题单元格时，我想设置标题单元格的边框颜色。

Answer 1

没有直接的方法可以做到这一点。您必须在CellPainting事件处理程序中绘制自己的边框。

使用类级别变量来存储单击的列标题索引。

int myClickedColumnHeaderIndex = -1;

订阅以下活动。

dataGridView1.CellPainting += dataGridView1_CellPainting;
dataGridView1.ColumnHeaderMouseClick += new DataGridViewCellMouseEventHandler(dataGridView1_ColumnHeaderMouseClick);

在ColumnHeaderMouseClick处理程序中使用类级别变量存储列索引。

void dataGridView1_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    if (e.Button == MouseButtons.Left && e.Clicks == 1)
    {
        dataGridView1.InvalidateCell(myClickedColumnHeaderIndex, -1); // this to trigger paint of the old cell inorder to remove the border drawn earlier.
        myClickedColumnHeaderIndex = e.ColumnIndex;
    }
}

在CellPainting事件处理程序中，使用所需的颜色绘制边框。

void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.RowIndex == -1 && e.ColumnIndex >= 0 && e.ColumnIndex == myClickedColumnHeaderIndex)
    {
        e.Paint(e.CellBounds, DataGridViewPaintParts.All & ~DataGridViewPaintParts.Border);
        using (Pen customPen = new Pen(Color.Blue, 2))
        {
            Rectangle rect = e.CellBounds;
            rect.Width -= 2;
            rect.Height -= 2;
            e.Graphics.DrawRectangle(customPen, rect);
        }
        e.Handled = true;
    }
}

Answer 2

此代码为每个偶数列的标题单元格和数据单元格绘制垂直边框。

private void DgvCalendar_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            int columnIndex = 0;

            if (e.RowIndex >= 0 && e.ColumnIndex >= columnIndex)
            {
                if (e.ColumnIndex % 2 == 0)
                {
                    var brush = new SolidBrush(dgvCalendar.ColumnHeadersDefaultCellStyle.BackColor);

                    e.Graphics.FillRectangle(brush, e.CellBounds);

                    brush.Dispose();

                    e.Paint(e.CellBounds, DataGridViewPaintParts.All & ~DataGridViewPaintParts.ContentBackground);

                    ControlPaint.DrawBorder(e.Graphics, e.CellBounds,
                        System.Drawing.Color.Transparent, 1, ButtonBorderStyle.Solid,
                        System.Drawing.Color.Transparent, 1, ButtonBorderStyle.Solid,
                        System.Drawing.Color.CornflowerBlue, 1, ButtonBorderStyle.Solid,
                        System.Drawing.Color.Transparent, 1, ButtonBorderStyle.Solid);

                    e.Handled = true;
                }
            }

            if (e.RowIndex == -1 && e.ColumnIndex >= columnIndex)
            {
                if (e.ColumnIndex % 2 == 0)
                {
                    e.Paint(e.CellBounds, DataGridViewPaintParts.All & ~DataGridViewPaintParts.Border);

                    ControlPaint.DrawBorder(e.Graphics, e.CellBounds,
                          System.Drawing.Color.Transparent, 1, ButtonBorderStyle.Solid,
                          System.Drawing.Color.Transparent, 1, ButtonBorderStyle.Solid,
                          System.Drawing.Color.CornflowerBlue, 1, ButtonBorderStyle.Solid,
                          System.Drawing.Color.Transparent, 1, ButtonBorderStyle.Solid);

                    e.Handled = true;

                    e.Handled = true;
                }
            }
        }

如何在DataGridView中设置特定标题单元格的边框颜色

2 个答案: