datagridview合并表头

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;

}

}

}

}

}