扩展：向DataGridView 增加日历列及日历单元格

using System;
using System.Windows.Forms;

namespace subform_TFS.Control
{
    /// <summary> 
    /// Calendar column in DataGridView 
    /// </summary> 
    /// <example > 
    /// DataGridViewCalendarColumn col = new DataGridViewCalendarColumn(); 
    /// col.DataPropertyName = "CreateDate"; 
    /// col.HeaderText = "Calendar"; 
    /// </example> 
    public class DataGridViewCalendarColumn : DataGridViewColumn
    {
        public DataGridViewCalendarColumn()
            : base(new DataGridViewCalendarCell())
        {
        }

        public override DataGridViewCell CellTemplate
        {
            get
            {
                return base.CellTemplate;
            }
            set
            {
                // Ensure that the cell used for the template is a DataGridViewCalendarCell. 
                if (value != null && !value.GetType().IsAssignableFrom(typeof(DataGridViewCalendarCell)))
                {
                    throw new InvalidCastException("Must be a DataGridViewCalendarCell");
                }
                base.CellTemplate = value;
            }
        }
    }

    /// <summary> 
    /// Calendar cell in DataGridView 
    /// </summary> 
    public class DataGridViewCalendarCell : DataGridViewTextBoxCell
    {
        public DataGridViewCalendarCell()
            : base()
        {
            this.Style.Format = "d";
        }

        public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
        {
            // Set the value of the editing control to the current cell value. 
            base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
            CalendarEditingControl ctl = DataGridView.EditingControl as CalendarEditingControl;
                        
            try
            {
                ctl.Value = (DateTime)this.Value;
            }
            catch (Exception)
            {
                ctl.Value = DateTime.Now;
            }
        }

        public override Type EditType
        {
            get
            {                
                return typeof(CalendarEditingControl);
            }
        }

        public override Type ValueType
        {
            get
            {
                return typeof(DateTime);
            }
        }

        public override object DefaultNewRowValue
        {
            get
            {
                // Use the current date and time as the default value..
                return DateTime.Now;
            }
        }
    }

    class CalendarEditingControl : DateTimePicker, IDataGridViewEditingControl
    {
        DataGridView dataGridView; 
        private bool valueChanged = false; 
        int rowIndex;
        public CalendarEditingControl()
        {
            this.Format = DateTimePickerFormat.Short;
        }

        public object EditingControlFormattedValue
        {
            get
            {
                return this.Value.ToShortDateString();
            }
            set
            {
                String newValue = value as String;
                if (newValue != null)
                {
                    this.Value = DateTime.Parse(newValue);
                }
            }
        }

        public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
        {
            return EditingControlFormattedValue;
        }

        public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
        {
            this.Font = dataGridViewCellStyle.Font;
            this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
            this.CalendarMonthBackground = dataGridViewCellStyle.BackColor;
        }

        public int EditingControlRowIndex
        {
            get
            {
                return rowIndex;
            }
            set
            {
                rowIndex = value;
            }
        }

        public bool EditingControlWantsInputKey(Keys key, bool dataGridViewWantsInputKey)
        {
            // Let the DateTimePicker handle the keys listed. 
            switch (key & Keys.KeyCode)
            {
                case Keys.Left:
                case Keys.Up:
                case Keys.Down:
                case Keys.Right:
                case Keys.Home:
                case Keys.End:
                case Keys.PageDown:
                case Keys.PageUp:
                    return true;
                default:
                    return false;
            }
        }

        public void PrepareEditingControlForEdit(bool selectAll)
        {
            // No preparation needs to be done. 
        }

        public bool RepositionEditingControlOnValueChange
        {
            get
            {
                return false;
            }
        }

        public DataGridView EditingControlDataGridView
        {
            get
            {
                return dataGridView;
            }
            set
            {
                dataGridView = value;
            }
        }

        public bool EditingControlValueChanged
        {
            get
            {
                return valueChanged;
            }
            set
            {
                valueChanged = value;
            }
        }

        public Cursor EditingPanelCursor
        {
            get
            {
                return base.Cursor;
            }
        }

        protected override void OnValueChanged(EventArgs eventargs)
        {
            // Notify the DataGridView that the contents of the cell have changed. 
            valueChanged = true;
            this.EditingControlDataGridView.NotifyCurrentCellDirty(true); base.OnValueChanged(eventargs);
        }
    }
}