改变 PropertyGrid 控件的编辑风格（1）——加入日期控件

答案：
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 ) 
       

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