Datagridview合并单元格
一直想把datagridview做成报表的样式，但是就得合并单元格，但是发现以前的知识没怎么用的上，后来在王少了这么一个源码，如果大家需要的话，直接复制粘贴就可以了，样式挺好看的。
private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (dataGridView1.Rows.Count > 0)
{
if (dataGridView1.Rows[0].Cells[0].Value.ToString().Trim() != string.Empty)
{
try
{
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
#region MyRegion
if (dataGridView1.Columns[i].Index == e.ColumnIndex && e.RowIndex >= 0)
{
using (
Brush gridBrush = new SolidBrush(dataGridView1.GridColor),
backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
// 擦除原单元格背景
e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
if (e.RowIndex != dataGridView1.RowCount - 1)
{
if (e.Value.ToString() != dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())
{
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线
}
}
else
{
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);//下边缘的线
}
//右侧的线
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, //x1,y1,x2,y2
e.CellBounds.Top, e.CellBounds.Right - 1,
e.CellBounds.Bottom - 1);
#region MyRegion
if (e.RowIndex == 0)
{
//绘制第一列的值
if (e.Value != null)
{
e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
Brushes.Crimson,
e.CellBounds.X + (e.CellBounds.Width - e.Graphics.MeasureString(e.Value.ToString().Trim(), e.CellStyle.Font).Width) / 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
else
{
if (e.Value.ToString() != dataGridView1.Rows[e.RowIndex - 1].Cells[e.ColumnIndex].Value.ToString())
{
//绘制值
if (string.IsNullOrEmpty(e.Value.ToString().Trim()).Equals(false))
{
e.Graphics.DrawString((String)e.Value, e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + (e.CellBounds.Width - e.Graphics.MeasureString(e.Value.ToString().Trim(), e.CellStyle.Font).Width) / 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
}
#endregion
e.Handled = true;
}
}
}
#endregion
}
}
catch { }
}
}
}
/// <summary>
/// 添加一个表格
/// </summary>
public void addDatatable()
{
DataColumn dc = new DataColumn("ID");
dt.Columns.Add(dc);
dc = new DataColumn("name");
dt.Columns.Add(dc);
dc = new DataColumn("age");
dt.Columns.Add(dc);
dc = new DataColumn("sex");
dt.Columns.Add(dc);
dt.Rows.Add(2, "上海", "5000", "7000");
dt.Rows.Add(2, "北京", "3000", "5600");
dt.Rows.Add(3, "纽约", "6000", "8600");
dt.Rows.Add(3, "华盛顿", "8000", "9000");
dt.Rows.Add(4, "伦敦", "7000", "8800");
}