效果图是这样的，如何把CheckBox放到左上角是最重要的。

 

添加

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);            }        }

 

添加方法 InitColumnInfo() 方法，代码如下。

private void InitColumnInfo()        {            int index = 0;            DataGridViewCheckBoxColumn colCB = new DataGridViewCheckBoxColumn();            DatagridViewCheckBoxHeaderCell cbHeader = new DatagridViewCheckBoxHeaderCell();            colCB.HeaderCell = cbHeader;            colCB.HeaderText = "";            colCB.FillWeight = 50;            cbHeader.OnCheckBoxClicked += new CheckBoxClickedHandler(cbHeader_OnCheckBoxClicked);            dataGridView2.Columns.Insert(index, colCB);            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 = new System.Windows.Forms.DataGridViewCellStyle();            dataGridViewCellStyle2.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleCenter;//211, 223, 240            dataGridViewCellStyle2.ForeColor = System.Drawing.Color.Blue;            dataGridViewCellStyle2.SelectionForeColor = System.Drawing.Color.Blue;            dataGridView2.Columns[index].DefaultCellStyle = dataGridViewCellStyle2;        }

在Clicked事件中添加代码

private void cbHeader_OnCheckBoxClicked(bool state)        {            //这一句很重要结束编辑状态            dataGridView2.EndEdit();            dataGridView2.Rows.OfType
     
      ().ToList().ForEach(t => t.Cells[0].Value = state);        }
     

最后在窗体的Load事件中，调用 InitColumnInfo() 方法就可以了。