Programs Knowledge

private void Form1_Load(object sender, EventArgs e)

{

    object[][] dbData = new object[][]

    {new object[]{1,null,null}

    ,new object[]{2,null,null}

    ,new object[]{3,null,null}

    ,new object[]{4,null,null}

    ,new object[]{5,null,null}};

    foreach (object[] obj in dbData)

        dgv.Rows.Add(obj);

    //第一組checkbox

    CheckBoxSelectAll.DatagridViewCheckBoxHeaderCell cbHeader1 = new CheckBoxSelectAll.DatagridViewCheckBoxHeaderCell();

    Column2.HeaderCell = cbHeader1;

    Column2.HeaderText = string.Empty;

    cbHeader1.OnCheckBoxClicked += new CheckBoxSelectAll.CheckBoxClickedHandler(cbHeader_OnCheckBoxClicked);

    //第二組checkbox

    CheckBoxSelectAll.DatagridViewCheckBoxHeaderCell cbHeader2 = new CheckBoxSelectAll.DatagridViewCheckBoxHeaderCell();

    Column3.HeaderCell = cbHeader2;

    Column3.HeaderText = string.Empty;

    cbHeader2.OnCheckBoxClicked += new CheckBoxSelectAll.CheckBoxClickedHandler(cbHeader_OnCheckBoxClicked);

}

//DataGridView全選功能

public void cbHeader_OnCheckBoxClicked(bool b, DataGridViewCellMouseEventArgs e)

{

    bool value = false;

    if (b)

        value = b;

    foreach (DataGridViewRow row in dgv.Rows)

        row.Cells[e.ColumnIndex].Value = value;

}

//DataGridView全選按鈕

public class CheckBoxSelectAll

{

    public delegate void CheckBoxClickedHandler(bool state, DataGridViewCellMouseEventArgs e);

    public class DataGridViewCheckBoxHeaderCellEventArgs : EventArgs

    {

        bool _bChecked;

        int _columnIndex;

        public DataGridViewCheckBoxHeaderCellEventArgs(bool bChecked, DataGridViewCellMouseEventArgs e)

        {

            _bChecked = bChecked;

            _columnIndex = e.ColumnIndex;

        }

        public bool Checked

        {

            get { return _bChecked; }

        }

        public int ColumnIndex

        {

            get { return _columnIndex; }

        }

    }

    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, e);

                    this.DataGridView.InvalidateCell(this);

                }

            }

            base.OnMouseClick(e);

        }

    }

}