DataGridView

Question

如何判断DataGridView是否被全选?(WinForm)

Answer 1

bool CheckSelectedStated(DataGridView dgv)
{
   foreach(DataRow row in dgv.Rows)
   {
      if(!row.Selected)
      {
         return false;
      }
   }
   return false;
}

Answer 2

if (this.dataGridView1.SelectedRows.Count<this.dataGridView1.Rows.Count)
            {
                this.dataGridView1.SelectAll();
            }

Answer 3

画个全选滴框框出来~
    class DGVColumnHeader : DataGridViewColumnHeaderCell
    {
        private Rectangle CheckBoxRegion;
        private bool checkAll = false;        protected override void Paint(Graphics graphics,
            Rectangle clipBounds, 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);            graphics.FillRectangle(new SolidBrush(cellStyle.BackColor), cellBounds);            CheckBoxRegion = new Rectangle(
                cellBounds.Location.X + 3,
                cellBounds.Location.Y + 2,
                25, cellBounds.Size.Height - 4);
            if (this.checkAll)
                ControlPaint.DrawCheckBox(graphics, CheckBoxRegion, ButtonState.Checked);
            else
                ControlPaint.DrawCheckBox(graphics, CheckBoxRegion, ButtonState.Normal);            Rectangle normalRegion =
                new Rectangle(
                cellBounds.Location.X + 1 + 25,
                cellBounds.Location.Y,
                cellBounds.Size.Width - 26,
                cellBounds.Size.Height);            graphics.DrawString(value.ToString(), cellStyle.Font, new SolidBrush(cellStyle.ForeColor), normalRegion);
        }        protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)
        {
            //Convert the CheckBoxRegion 
            Rectangle rec = new Rectangle(new Point(0, 0), this.CheckBoxRegion.Size);
            this.checkAll = !this.checkAll;
            if (rec.Contains(e.Location))
            {
                this.DataGridView.Invalidate();
            }
            base.OnMouseClick(e);
        }        public bool CheckAll
        {
            get { return this.checkAll; }
            set { this.checkAll = value; }
        }
    }
全选滴事件private void dgv_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            DataGridView dgv = (DataGridView)sender;
            if (e.ColumnIndex == 0)
            {
                for (int i = 0; i < dgv.Rows.Count; i++)
                {
                    dgv.Rows[i].Cells[0].Value = dgvColumnHeader.CheckAll;
                }
            }
        }