DatagridviewCheckboxHeaderCell

• 定义checkBoxHead

public delegate void DatagridviewcheckboxHeaderEventHander(object sender, DatagridviewCheckboxHeaderEventArgs e);

    public class DatagridviewCheckboxHeaderEventArgs : EventArgs
    {
        public DatagridviewCheckboxHeaderEventArgs()
        {
            CheckedState = false;
        }
        public bool CheckedState { get; set; }
    }

    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 DatagridviewcheckboxHeaderEventHander OnCheckBoxClicked;
        //绘制列头checkbox
        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) - 1;//列头checkbox的X坐标
            p.Y = cellBounds.Location.Y +
                (cellBounds.Height / 2) - (s.Height / 2);//列头checkbox的Y坐标
            _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);
        }

        /// <summary>
        /// 点击列头checkbox单击事件
        /// </summary>
        protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)
        {
            var 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;
                //获取列头checkbox的选择状态
                var ex = new DatagridviewCheckboxHeaderEventArgs { CheckedState = _checked };
                var sender = new object();//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
                if (OnCheckBoxClicked != null)
                {
                    OnCheckBoxClicked(sender, ex);//触发单击事件
                    this.DataGridView.InvalidateCell(this);
                }
            }
            base.OnMouseClick(e);
        }
    }

• 调用

![DatagridviewCheckboxHeaderCell](C:\Users\cnsghsuf\Desktop\TrainingMaterial\孙斧林\C#\RepaintControl\images\DatagridviewCheckboxHeaderCell.png)columnIndex = this.gridTemplate.Columns.Add(new DataGridViewCheckBoxColumn());
                    this.gridTemplate.Columns[0].Width = 50;

                    var ch = new DatagridviewCheckboxHeaderCell();
                    ch.OnCheckBoxClicked += new DatagridviewcheckboxHeaderEventHander(ch_OnCheckBoxClicked);
                    var checkboxCol = this.gridTemplate.Columns[0] as DataGridViewCheckBoxColumn;
                    checkboxCol.HeaderCell = ch;
                    checkboxCol.HeaderCell.Value = string.Empty;



private void ch_OnCheckBoxClicked(object sender, DatagridviewCheckboxHeaderEventArgs e)
        {
            try
            {
                for (int i = 0; i < gridTemplate.Rows.Count; i++)
                {
                    gridTemplate.Rows[i].Cells[0].Value = e.CheckedState;
                }
            }
            catch (Exception ex)
            {
                view.ErrorHandler(2, ex.Message + ";" + ex.StackTrace, "");
            }
        }

• 效果