010. Using the properties provided by the. NET Framework

C # allows you to declare attributes (classes) on classes and class members, and to interpret the members of classes and classes at run time. This feature is also called a property, using attribute. The following shows how to use the properties provided by the. NET Framework.

1 usingSystem;2 usingSystem.Reflection;3  Public Partial class_default:system.web.ui.page4 {5     //Custom Attribute Classes6[AttributeUsage (attributetargets.class, AllowMultiple =true)]7      Public classBookattribute:attribute//Attribute base class for custom properties8     {9         Private stringBookName;Ten          PublicBookattribute (stringbookname) One         { A              This. BookName =BookName; -         } -          Public string Book the         { -             Get -             { -                 returnBookName; +             } -         } +     } A  at     //using attribute classes more than once -[Book ("ASP. NET entry basics;")] -[Book ("C # practical Case")] -      Public classBookInfo -     { -          Public stringBinfo ="Book Information ***********"; in          PublicBookInfo () -         { to  +         } -     } the  *     //example of a Page_Load invocation of a page custom property $     protected voidPage_Load (Objectsender, EventArgs e)Panax Notoginseng     { -         //instantiate the BookInfo class theBookInfo BF =NewBookInfo (); +         //Object Array A         Object[] bookattr; the         //gets the object type, gets information about member attributes, and provides access to member metadata +MemberInfo TypeInfo =typeof(BookInfo); -         //extract type is a member of an attribute class $Bookattr = Typeinfo.getcustomattributes (typeof(Bookattribute),false); $         if(Bookattr.getlength (0) !=0) -         { -Bookattribute ba = (bookattribute) (bookattr[0]);//gets the first member of an attribute class theBookattribute Ba2 = (bookattribute) (bookattr[1]);//gets the second member of an attribute class - Response.Write (bf.binfo);WuyiResponse.Write ("<br/>"); theResponse.Write ("Book name:"+ BA. Book +Ba2. book); -         }    Wu     } -}

010. Using the properties provided by the. NET Framework