众所周知，datagridview控件是CS架构中用的比较频繁的一个控件，里面提供了checkbox列的功能，可是却没有在列头给出checkbox控件用于全选/全部取消所有行的功能，确实是个遗憾，这里就通过绘制实现这个功能.
效果图：
一.创建一个表,里面包含bit字段，datagridview的DataGridViewCheckBoxColumn列会自动将其转换成checkbox列
二. 界面上调用
DataGridView绑定完数据以后,在第一列绘制CheckBox列头，可以在DataBindingComplete事件中处理
grid.DataBindingAfter += new Action(DataBindingAterEventHandler);
处理列头全选事件
行多选处理
实现核心代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace YXSY.UI.UICommon
{
///
/// 功能描述：在DataGridView列头绘制CheckBox控件
///
///
/// 创建日期：2010-12-03, 作者：Huang.Ting
///
//实现全选的事件参数类
public class DataGridviewCheckboxHeaderEventHander : EventArgs
{
private bool checkedState = false;
public bool CheckedState
{
get { return checkedState; }
set { checkedState = value; }
}
}
//与事件关联的委托
public delegate void DataGridviewCheckboxHeaderCellEventHander(object sender, DataGridviewCheckboxHeaderEventHander e);
//重写 DataGridViewColumnHeaderCell
public class DataGridviewCheckboxHeaderCell : DataGridViewColumnHeaderCell
{
private Point checkBoxLocation;
private Size checkBoxSize;
private bool isChecked = false;
private Point cellLocation = new Point();
private CheckBoxState cbState = CheckBoxState.UncheckedNormal;
public event DataGridviewCheckboxHeaderCellEventHander OnCheckBoxClicked;
//绘制列头checkbox
protected override void Paint(Graphics g,
Rectangle clipBounds,
Rectangle cellBounds,
int rowIndex,
DataGridViewElementStates dataGridViewElementState,
object value,
object formattedValue,
string errorText,
DataGridViewCellStyle cellStyle,
DataGridViewAdvancedBorderStyle advancedBorderStyle,
DataGridViewPaintParts paintParts)
{
base.Paint(g, clipBounds, cellBounds, rowIndex,dataGridViewElementState, value,formattedValue, errorText, cellStyle,advancedBorderStyle, paintParts);
Point p = new Point();
Size s = CheckBoxRenderer.GetGlyphSize(g, CheckBoxState.UncheckedNormal);
//列头checkbox的X坐标
p.X = cellBounds.Location.X +(cellBounds.Width / 2) - (s.Width / 2) - 1;
//列头checkbox的Y坐标
p.Y = cellBounds.Location.Y +(cellBounds.Height / 2) - (s.Height / 2);
cellLocation = cellBounds.Location;
checkBoxLocation = p;
checkBoxSize = s;
if (isChecked)
cbState = CheckBoxState.CheckedNormal;
else
cbState = CheckBoxState.UncheckedNormal;
//绘制复选框
CheckBoxRenderer.DrawCheckBox(g, checkBoxLocation, cbState);
}
///
/// 响应点击列头checkbox单击事件
///
protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)
{
Point p = new Point(e.X + cellLocation.X, e.Y + cellLocation.Y);
if (p.X >= checkBoxLocation.X && p.X <= checkBoxLocation.X + checkBoxSize.Width && p.Y >= checkBoxLocation.Y && p.Y <= checkBoxLocation.Y + checkBoxSize.Height)
{
isChecked = !isChecked;
//获取列头checkbox的选择状态
DataGridviewCheckboxHeaderEventHander ex = new DataGridviewCheckboxHeaderEventHander();
ex.CheckedState = isChecked;
//此处不代表选择的列头checkbox，只是作为参数传递。应该列头checkbox是绘制出来的，无法获得它的实例
object sender = new object();
if (OnCheckBoxClicked != null)
{
//触发单击事件
OnCheckBoxClicked(sender, ex);
this.DataGridView.InvalidateCell(this);
}
}
base.OnMouseClick(e);
}
}
}