datagridview合并表头

1.功能说明：

将连续的多个列合并成一个新列。

2.不足之处：

不能合并多层。比如下图这样的功能是没有的。

3.使用参考.

在form的构造函数里写下如下代码

Utility.exGridView.isEnLarged = false;
在datagridview的cellpaiting事件中写如下代码

Utility.exGridView exG = new Utility.exGridView();
List colNameCollection=new List();
for (int i = 0; i < 10; i++)
{
//"colDraw"+i.ToString()是columnName的属性值
colNameCollection.Add("colDraw" + i.ToString());
}
exG.MergeHeader(sender, e, colNameCollection, "0-9中奖号码分布图");
4.效果截图

5.源文件(没找到添加附件的地方，就贴出代码了)

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace Utility
{
public class exGridView
{
#region 合并列时使用到的位置和大小属性
int cTop = 0;//被合并表头区域的顶部坐标
int cLeft = 0;//被合并表头区域的左边坐标
/// <summary>
/// 被合并表头区域的宽
/// </summary>
int cWidth = 0;
int cHeight = 0;//。。。高
#endregion
/// <summary>
/// 判断是否已经将datagridview的表头变高了，只增高一次。
/// </summary>
public static bool isEnLarged = false;

/// <summary>
/// 合并表头,用在dataGridView的CellPainting事件中。
/// </summary>
/// <param name="sender">需要重绘的dataGridview</param>
/// <param name="e">CellPainting中的参数</param>
///<param name="colName">列的集合(列必须是连续的，第一列放在最前面)</param>
/// <param name="headerText">列合并后显示的文本</param>
public void MergeHeader(object sender, DataGridViewCellPaintingEventArgs e,List<string> colNameCollection,string headerText)
{
if (e.RowIndex == -1)
{
DataGridView dataGridView1=sender as DataGridView;
string colName = dataGridView1.Columns[e.ColumnIndex].Name;
if (!isEnLarged)
{
//0.扩展表头高度为当前的2倍
dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing;
dataGridView1.ColumnHeadersHeight = e.CellBounds.Height * 2;
isEnLarged = true;
}
if (colNameCollection.Contains(colName))
{
#region 重绘列头
//1.计算colLen个列的区域
if (colNameCollection.IndexOf(colName)==0)
{
cTop = e.CellBounds.Top;
cLeft = e.CellBounds.Left;

cWidth = e.CellBounds.Width;
cHeight = e.CellBounds.Height/2;

foreach(string colNameItem in colNameCollection)
{
if (colNameItem.Equals(colName))
{//除去自己一个，加了之后colLen-1个列的宽
continue;
}
cWidth += dataGridView1.Columns[colNameItem].Width;
}
}

Rectangle cArea = new Rectangle(cLeft, cTop, cWidth, cHeight);
//2.把区域设置为背景色，没有列的分线及任何文字。
using (Brush backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
e.Graphics.FillRectangle(backColorBrush, cArea);

}
//3.绘制新列头的边框
using (Pen gridPen = new Pen(dataGridView1.GridColor))
{
//3.1 上部边框
e.Graphics.DrawLine(gridPen, cLeft, cTop, cLeft + cWidth, cTop);
using (Pen hilightPen = new Pen(Color.WhiteSmoke))
{
//3.2 顶部高光
e.Graphics.DrawLine(hilightPen, cLeft, cTop + 1, cLeft + cWidth, cTop + 1);
//3.3 左部反光线
e.Graphics.DrawLine(hilightPen, cLeft, cTop + 3, cLeft, cTop + cHeight - 2);
}
//3.4 下部边框
e.Graphics.DrawLine(gridPen, cLeft, cTop + cHeight - 1, cLeft + cWidth, cTop + cHeight - 1);
//3.5 右部边框
e.Graphics.DrawLine(gridPen, cLeft + cWidth - 1, cTop, cLeft + cWidth - 1, cTop + cHeight);//(cTop+cHeight)/2);
}
//4.写文本
if (colNameCollection.IndexOf(colName) == 0)
{//不是第一列则不写文字。
int wHeadStr = (int)(headerText.Length * e.CellStyle.Font.SizeInPoints);
int wHeadCell = cWidth;
int pHeadLeft = (wHeadCell - wHeadStr) / 2 - 6;
using (Brush foreBrush = new SolidBrush(e.CellStyle.ForeColor))
{
e.Graphics.DrawString(headerText, e.CellStyle.Font, foreBrush, new PointF(cLeft + pHeadLeft, cTop + 3));
}
}

//5 绘制子列背景
int FatherColHeight = e.CellBounds.Height / 2;//上面一行的高度
using (Brush backColorBrush = new SolidBrush(e.CellStyle.BackColor))
{
e.Graphics.FillRectangle(backColorBrush, new Rectangle(e.CellBounds.X, e.CellBounds.Y + FatherColHeight, e.CellBounds.Width - 1, e.CellBounds.Height / 2 - 1));
}
//5.1绘制子列的边框
using (Pen gridPen = new Pen(dataGridView1.GridColor))
{
using (Pen hilightPen = new Pen(Color.WhiteSmoke))
{
//5.2 左部反光线
e.Graphics.DrawLine(hilightPen, cLeft, cTop + 3 + FatherColHeight, cLeft, cTop + cHeight - 2 + FatherColHeight);
}
//5.3 下部边框
e.Graphics.DrawLine(gridPen, cLeft, cTop + cHeight - 1 + FatherColHeight, cLeft + cWidth, cTop + cHeight - 1 + FatherColHeight);

//5.4 右部边框
e.Graphics.DrawLine(gridPen, e.CellBounds.X + e.CellBounds.Width - 1, e.CellBounds.Top + FatherColHeight, e.CellBounds.X + e.CellBounds.Width - 1, e.CellBounds.Top + e.CellBounds.Height + FatherColHeight);//(cTop+cHeight)/2);

}
//5.5 写子列的文本
int wStr = (int)(dataGridView1.Columns[e.ColumnIndex].HeaderText.Length * e.CellStyle.Font.SizeInPoints);
int wCell = e.CellBounds.Width;
int pLeft = (wCell - wStr) / 2;//相对CELL左边框的左坐标

using (Brush foreBrush = new SolidBrush(e.CellStyle.ForeColor))
{
e.Graphics.DrawString(dataGridView1.Columns[e.ColumnIndex].HeaderText, e.CellStyle.Font, foreBrush, new PointF(e.CellBounds.X + pLeft, cTop + 3 + FatherColHeight));
}
#endregion
e.Handled = true;
}
}
}
}
}

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