改變 propertygrid 控件的編輯風格（1）——加入日期控件

張昱[email protected]

 效果：

適用場合：

編輯日期類型數據

步驟一：定義從uitypeeditor 派生的類，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 上顯示日期控件

     ///

     /// </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;

         }

     }

}

步驟二：編輯屬性類，指定編輯屬性。示例如下：

namespace blog.csdn.net.zhangyuk

{

         public class someproperties

     {

         private string _finished_time   = "";

                   ……

         [

description("完成時間"),

              category("屬性"),

            editorattribute(typeof(propertygriddateitem),

typeof(system.drawing.design.uitypeeditor))

         ]          ]

         public string 完成時間

         {

              get { return _finished_date; }

              set { _finished_date = value;}

         }

         ……

         }

}

步驟三：設置propertygrid的屬性對象。示例如下：

         private void form1_load(object sender, system.eventargs e)

         {

            this.propertygrid1.selectedobject = new someproperties();

         }