DataGridView自定义列在运行时访问设计时间参数 [英] DataGridView custom column accessing design time parameters at run time
问题描述
我一直在玩一些示例代码，它为DataGridView实现了一个datepicker列。
I have been playing with some sample code which implements a datepicker column for a DataGridView.
我正在努力的是在如何适当地访问设计时间参数（感谢Bradley Smith的覆盖Clone方法的提示）在我想要的CalendarEditingControl中将格式设置为DateFormat。
Where I'm struggling is in how to appropriately access design time parameters (thanks to Bradley Smith for the tip on overriding the Clone method) in the CalendarEditingControl where I want to set the Format to the DateFormat.
下面提供了完整的示例，并查看我要使用DateFormat如果您只是扫描注释：
// * ** * ** * ** * * 'd喜欢将格式设置为在DataGridViewCalendarColumn.DateFormat中提供的设计时间值这里 * ** * ** * ** * //
I've provided the complete sample below and to see where I want to use DateFormat if you just scan for the comment: //*********** I'd like to set the Format to the design time value provided inDataGridViewCalendarColumn.DateFormat here ***********//
谢谢
Matt
使用系统;
使用System.Windows.Forms;
using System; using System.Windows.Forms;
命名空间MyApplication.Components
{
public class DataGridViewCalendarColumn：DataGridViewColumn
{
public DataGridViewCalendarColumn（）
：base（new CalendarCell（））
{
}
namespace MyApplication.Components { public class DataGridViewCalendarColumn : DataGridViewColumn { public DataGridViewCalendarColumn() : base(new CalendarCell()) { }
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
// Ensure that the cell used for the template is a CalendarCell.
if (value != null &&
!value.GetType().IsAssignableFrom(typeof(CalendarCell)))
{
throw new InvalidCastException("Must be a CalendarCell");
}
base.CellTemplate = value;
}
}
public DateTimePickerFormat DateFormat { get; set; }
public override object Clone()
{
DataGridViewCalendarColumn clone = (DataGridViewCalendarColumn)base.Clone();
clone.DateFormat = this.DateFormat;
return clone;
}
}
public class CalendarCell : DataGridViewTextBoxCell
{
public CalendarCell(): base()
{
// Use the short date format.
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;
// Use the default row value when Value property is null.
if (this.Value == null)
{
ctl.Value = (DateTime)this.DefaultNewRowValue;
}
else
{
ctl.Value = (DateTime)this.Value;
}
}
public override Type EditType
{
get
{
// Return the type of the editing control that CalendarCell uses.
return typeof(CalendarEditingControl);
}
}
public override Type ValueType
{
get
{
// Return the type of the value that CalendarCell contains.
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()
{
//*********************** I'd like to set the Format to the design time value provided inDataGridViewCalendarColumn.DateFormat here ***********************//
//(instead of hard coding it to DateTimePickerFormat.Short)
this.Format = DateTimePickerFormat.Short;
}
// Implements the IDataGridViewEditingControl.EditingControlFormattedValue
// property.
public object EditingControlFormattedValue
{
get
{
return this.Value.ToShortDateString();
}
set
{
if (value is String)
{
try
{
// This will throw an exception of the string is
// null, empty, or not in the format of a date.
this.Value = DateTime.Parse((String)value);
}
catch
{
// In the case of an exception, just use the
// default value so we're not left with a null
// value.
this.Value = DateTime.Now;
}
}
}
}
// Implements the
// IDataGridViewEditingControl.GetEditingControlFormattedValue method.
public object GetEditingControlFormattedValue(
DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
}
// Implements the
// IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
public void ApplyCellStyleToEditingControl(
DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
this.CalendarForeColor = dataGridViewCellStyle.ForeColor;
this.CalendarMonthBackground = dataGridViewCellStyle.BackColor;
}
// Implements the IDataGridViewEditingControl.EditingControlRowIndex
// property.
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
}
// Implements the IDataGridViewEditingControl.EditingControlWantsInputKey
// method.
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 !dataGridViewWantsInputKey;
}
}
// Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
// method.
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
}
// Implements the IDataGridViewEditingControl
// .RepositionEditingControlOnValueChange property.
public bool RepositionEditingControlOnValueChange
{
get
{
return false;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlDataGridView property.
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlValueChanged property.
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingPanelCursor property.
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);
}
}
}
推荐答案
所有您需要做的是将 DateFormat 属性从列中应用到编辑控件。在 InitializeEditingControl 方法中，添加以下行：
All you need to do is apply the DateFormat property from the column onto the editing control. In the InitializeEditingControl method, add the following line:
ctl.Format = (OwningColumn as DataGridViewCalendarColumn).DateFormat;
应该做的伎俩。
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