datagridview中的Datetimepicker大小

public class DataGridViewDateTimePickerColumn : DataGridViewColumn
{
    public DataGridViewDateTimePickerColumn()
    {
        this.CellTemplate = new DataGridViewDateTimePickerCell();
    }
}

public class DataGridViewDateTimePickerCell : DataGridViewTextBoxCell
{
    public DataGridViewDateTimePickerCell()
    {
        this.Style.Format = "yyyy-MM-dd HH:mm:ss";
    }

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

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

    public override object DefaultNewRowValue
    {
        get
        {
            return DateTime.Now;
        }
    }
}

public class DataGridViewDateTimePickerEditingControl : DateTimePicker, IDataGridViewEditingControl
{
    private DataGridView dataGridView;
    private bool valueChanged = false;
    private int rowIndex;

    public DataGridViewDateTimePickerEditingControl()
    {
        this.Format = DateTimePickerFormat.Custom;
        this.CustomFormat = "yyyy-MM-dd HH:mm:ss";
    }

    public object EditingControlFormattedValue
    {
        get
        {
            return this.Value.ToString("yyyy-MM-dd HH:mm:ss");
        }
        set
        {
            if (value is string)
            {
                DateTime parsedDate;
                if (DateTime.TryParse((string)value, out parsedDate))
                {
                    this.Value = parsedDate;
                }
            }
        }
    }

    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 keyData, bool dataGridViewWantsInputKey)
    {
        switch (keyData & 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 !dataGridViewWantsInputKey;
        }
    }

    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)
    {
        valueChanged = true;
        this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
        base.OnValueChanged(eventargs);
    }
}

DataGridViewDateTimePickerColumn column = new DataGridViewDateTimePickerColumn();
dataGridView.Columns.Add(column);