C# Winform中DataGridView 设置全选/取消

public partial
class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private
void button1_Click(object sender, EventArgs e)

        {

            DataTable dt =
new DataTable();

            DataColumn column;

            for (int i
= 0; i
< 4; i++)

            {

                if (i
== 3)

                {

                    column =
new DataColumn();

                    column.ColumnName =
"column"
+ i;

                    column.DataType =
typeof(Boolean);

                    dt.Columns.Add(column);

                    dataGridView1.DataSource = dt;

                }

                else

                {

                    column =
new DataColumn();

                    column.ColumnName =
"column"
+ i;

                    column.DataType =
typeof(string);

                    dt.Columns.Add(column);

                }

            }

            for (int i
= 0; i
< 4; i++)

            {

                DataRow row = dt.NewRow();

                for (int j
= 0; j
< 4; j++)

                {

                    if (j
== 3)

                    {

                        row[j] =
false;

                    }

                    else

                    {

                        row[j] = i.ToString();

                    }

                }

                dt.Rows.Add(row);

            }

            dataGridView1.DataSource = dt;

            datagridviewCheckboxHeaderCell ch =
new datagridviewCheckboxHeaderCell();

            ch.OnCheckBoxClicked +=
new datagridviewcheckboxHeaderEventHander(ch_OnCheckBoxClicked);

            //第四列为DataGridViewCheckBoxColumn

            DataGridViewCheckBoxColumn checkboxCol
= this.dataGridView1.Columns[3]
as DataGridViewCheckBoxColumn;

            checkboxCol.HeaderCell = ch;

            checkboxCol.HeaderCell.Value =
string.Empty;//消除列头checkbox旁出现的文字

        }

        void ch_OnCheckBoxClicked(object sender, Form1.datagridviewCheckboxHeaderEventArgs e)

        {

            foreach (DataGridViewRow dgvRow
in this.dataGridView1.Rows)

            {

                if (e.CheckedState)

                {

                    dgvRow.Cells[3].Value
= true;

                }

                else

                {

                    dgvRow.Cells[3].Value
= false;

                }

            }

        }

        //定义触发单击事件的委托

        public
delegate
void datagridviewcheckboxHeaderEventHander(object sender, datagridviewCheckboxHeaderEventArgs e);

        //定义包含列头checkbox选择状态的参数类

        class datagridviewCheckboxHeaderEventArgs : EventArgs

        {

            private
bool checkedState
= false;

            public
bool CheckedState

            {

                get {
return checkedState; }

                set { checkedState
= value; }

            }

        }

        //定义继承于DataGridViewColumnHeaderCell的类，用于绘制checkbox，定义checkbox鼠标单击事件

        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)

            {

                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;

                    //获取列头checkbox的选择状态

                    datagridviewCheckboxHeaderEventArgs ex
= new datagridviewCheckboxHeaderEventArgs();

                    ex.CheckedState = _checked;

                    object 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);

            }

        }

    }//end class