改变 PropertyGrid 控件的编辑风格（1）——加入日期控件
张昱e-zhangyu@vip.sina.com
效果：
适用场合：
编辑日期类型数据
步骤一：定义从UITypeEditor 派生的类，示例如下：
using System;
using System.Windows.Forms;
using System.Drawing.Design;
using System.Windows.Forms.Design;
namespace blog.csdn.net.zhangyuk
{
/// <summary>
/// 在 PropertyGrid 上显示日期控件
///
/// </summary>
public class PropertyGridDateItem : UITypeEditor
{
MonthCalendar dateControl = new MonthCalendar();
public PropertyGridDateItem()
{
dateControl.MaxSelectionCount = 1;
}
public override UITypeEditorEditStyle GetEditStyle(
System.ComponentModel.ITypeDescriptorContext context)
{
return UITypeEditorEditStyle.DropDown;
}
public override object EditValue(
System.ComponentModel.ITypeDescriptorContext context,
System.IServiceProvider provider,
object value)
{
try
{
IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)
provider.GetService(typeof(IWindowsFormsEditorService));
if( edSvc != null )
{
if( value is string )
{
dateControl.SelectionStart = DateTime.Parse( value as String );
edSvc.DropDownControl( dateControl );
return dateControl.SelectionStart.ToShortDateString();
}
else if( value is DateTime )
{
dateControl.SelectionStart = (DateTime)value;
edSvc.DropDownControl( dateControl );
return dateControl.SelectionStart;
}
}
}
catch( Exception ex )
{
System.Console.WriteLine( "PropertyGridDateItem Error : " + ex.Message );
return value;
}
return value;
}
}
}
步骤二：编辑属性类，指定编辑属性。示例如下：
namespace blog.csdn.net.zhangyuk
{
public class SomeProperties
{
private string _finished_time = "";
……
[
Description("完成时间"),
Category("属性"),
EditorAttribute(typeof(PropertyGridDateItem),
typeof(System.Drawing.Design.UITypeEditor))
]
]
public String 完成时间
{
get { return _finished_date; }
set { _finished_date = value;}
}
……
}
}
步骤三：设置PropertyGrid的属性对象。示例如下：
private void Form1_Load(object sender, System.EventArgs e)
{
this.propertyGrid1.SelectedObject = new SomeProperties();
}
