#region"合並單元格的測試(一列或一行)"
// int?是搜索一種類型(可空類型)，普通的int不能為null，而用int?，其值可以為null
//private int? nextrow = null;
//private int? nextcol = null;
//在CellPainting方法后調用
private void dataGridView1_CellFormatting(object sender, System.Windows.Forms.DataGridViewCellFormattingEventArgs e)
{
/*
//列標示
if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PARENTID" && e.RowIndex >= 0)
{
//若與下一行同列單元格值相同則修改設置
if (e.RowIndex < this.dataGridView1.RowCount - 1 && this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value != null)
{
if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())
{
e.CellStyle.BackColor = Color.LightPink;
this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Style.BackColor = Color.LightPink;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
//this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].ReadOnly = true;
}
}
}
*/
/*
//行標示
if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PHONE1" && e.RowIndex >= 0)
{
//若與同行下一列單元格值相同則修改設置
if (e.ColumnIndex != this.dataGridView1.ColumnCount - 1 && this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value != null)
{
if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString())
{
e.CellStyle.BackColor = Color.LightBlue;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Style.BackColor = Color.LightPink;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
//this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].ReadOnly = true;
}
}
}
*/
}
//==========================
//繪制單元格
private void dataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e)
{
//縱向合並
if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PARENTID" && e.RowIndex >= 0)
{
using (
Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),
backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
// 擦除原單元格背景
e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
/****** 繪制單元格相互間隔的區分線條，datagridview自己會處理左側和上邊緣的線條，因此只需繪制下邊框和和右邊框
DataGridView控件繪制單元格時，不繪制左邊框和上邊框，共用左單元格的右邊框，上一單元格的下邊框*****/
//不是最后一行且單元格的值不為null
if (e.RowIndex < this.dataGridView1.RowCount - 1 && this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value != null)
{
//若與下一單元格值不同
if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString())
{
//下邊緣的線
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
//繪制值
if (e.Value != null)
{
e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
//若與下一單元格值相同
else
{
//背景顏色
//e.CellStyle.BackColor = Color.LightPink; //僅在CellFormatting方法中可用
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = Color.LightBlue;
this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Style.BackColor = Color.LightBlue;
//只讀（以免雙擊單元格時顯示值）
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].ReadOnly = true;
}
}
//最后一行或單元格的值為null
else
{
//下邊緣的線
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
//繪制值
if (e.Value != null)
{
e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
////左側的線（）
//e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left,
// e.CellBounds.Top, e.CellBounds.Left,
// e.CellBounds.Bottom - 1);
//右側的線
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1,
e.CellBounds.Top, e.CellBounds.Right - 1,
e.CellBounds.Bottom - 1);
//設置處理事件完成（關鍵點），只有設置為ture,才能顯示出想要的結果。
e.Handled = true;
}
}
}
//橫向合並
if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PHONE1" && e.RowIndex >= 0)
{
using (
Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor),
backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
using (Pen gridLinePen = new Pen(gridBrush))
{
// 擦除原單元格背景
e.Graphics.FillRectangle(backColorBrush, e.CellBounds);
/****** 繪制單元格相互間隔的區分線條，datagridview自己會處理左側和上邊緣的線條，因此只需繪制下邊框和和右邊框
DataGridView控件繪制單元格時，不繪制左邊框和上邊框，共用左單元格的右邊框，上一單元格的下邊框*****/
//不是最后一列且單元格的值不為null
if (e.ColumnIndex < this.dataGridView1.ColumnCount - 1 && this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value != null)
{
if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString())
{
//右側的線
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
//繪制值
if (e.Value != null)
{
e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
//若與下一單元格值相同
else
{
//背景顏色
//e.CellStyle.BackColor = Color.LightPink; //僅在CellFormatting方法中可用
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = Color.LightPink;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Style.BackColor = Color.LightPink;
//只讀（以免雙擊單元格時顯示值）
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].ReadOnly = true;
}
}
else
{
//右側的線
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
//繪制值
if (e.Value != null)
{
e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
Brushes.Crimson, e.CellBounds.X + 2,
e.CellBounds.Y + 2, StringFormat.GenericDefault);
}
}
//下邊緣的線
e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1,
e.CellBounds.Right - 1, e.CellBounds.Bottom - 1);
e.Handled = true;
}
}
}
}
#endregion
