datagridview表头全选

参与程序http://www.codeproject.com/KB/grid/CheckBoxHeaderCell.aspx 这里老外写的一个控件，他少了委托重载的一个方法。先写一个控件

public delegate void CheckBoxClickedHandler(bool state);
        public class DataGridViewCheckBoxHeaderCellEventArgs : EventArgs
        {
            bool _bChecked;
            public DataGridViewCheckBoxHeaderCellEventArgs(bool bChecked)
            {
                _bChecked = bChecked;
            }
            public bool Checked
            {
                get { return _bChecked; }
            }
        }

        public class DatagridViewCheckBoxHeaderCell : DataGridViewColumnHeaderCell
        {
            Point checkBoxLocation;
            Size checkBoxSize;
            bool _checked = false;
            Point _cellLocation = new Point();
            System.Windows.Forms.VisualStyles.CheckBoxState _cbState =
                System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal;
            public event CheckBoxClickedHandler OnCheckBoxClicked;

            public DatagridViewCheckBoxHeaderCell()
            {
            }

            protected override void Paint(System.Drawing.Graphics graphics,
                System.Drawing.Rectangle clipBounds,
                System.Drawing.Rectangle cellBounds,
                int rowIndex,
                DataGridViewElementStates dataGridViewElementState,
                object value,
                object formattedValue,
                string errorText,
                DataGridViewCellStyle cellStyle,
                DataGridViewAdvancedBorderStyle advancedBorderStyle,
                DataGridViewPaintParts paintParts)
            {
                base.Paint(graphics, clipBounds, cellBounds, rowIndex,
                    dataGridViewElementState, value,
                    formattedValue, errorText, cellStyle,
                    advancedBorderStyle, paintParts);
                Point p = new Point();
                Size s = CheckBoxRenderer.GetGlyphSize(graphics,
                System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal);
                p.X = cellBounds.Location.X +
                    (cellBounds.Width / 2) - (s.Width / 2);
                p.Y = cellBounds.Location.Y +
                    (cellBounds.Height / 2) - (s.Height / 2);
                _cellLocation = cellBounds.Location;
                checkBoxLocation = p;
                checkBoxSize = s;
                if (_checked)
                    _cbState = System.Windows.Forms.VisualStyles.
                        CheckBoxState.CheckedNormal;
                else
                    _cbState = System.Windows.Forms.VisualStyles.
                        CheckBoxState.UncheckedNormal;
                CheckBoxRenderer.DrawCheckBox
                (graphics, checkBoxLocation, _cbState);
            }

            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)
                {
                    _checked = !_checked;
                    if (OnCheckBoxClicked != null)
                    {
                        OnCheckBoxClicked(_checked);
                        this.DataGridView.InvalidateCell(this);
                    }

                }
                base.OnMouseClick(e);
            }

    }

　　然后在前台做个窗体，加个datagridview控件，加个几行，注意datagirdview有编辑状态，如果只有一行又是在编辑状态，就不起作用了。当然一般全选控件不可能在编辑状态

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //DataGridViewCheckBoxColumn colCB = new DataGridViewCheckBoxColumn();
            DatagridViewCheckBoxHeaderCell cbHeader = new DatagridViewCheckBoxHeaderCell();
            //colCB.HeaderCell = cbHeader;
            //dataGridView1.Columns.Add(colCB);
            cbHeader.Value = string.Empty;
            cbHeader.OnCheckBoxClicked += new CheckBoxClickedHandler(cbHeader_OnCheckBoxClicked);

            dataGridView1.Columns[0].HeaderCell = cbHeader;
        }

        private void cbHeader_OnCheckBoxClicked(bool state)
        {　　　　　　　　

　　　　          //这一句很重要结束编辑状态
　　　　　　　　dgvWarn.EndEdit();

            if (dataGridView1.Rows.Count > 0)
            {
                for (int i = 0; i < dataGridView1.Rows.Count; i++)
                {
                    dataGridView1.Rows[i].Cells[0].Value = state;
                }
            }
        }
    }