Change uncertainty to confirmation ~ Can the description be obtained by enumeration of the Flag feature?

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I have previously written a method for outputting description feature information for objects of the common Enumeration type. Today I will focus on how to implement the description information of the flags enumeration element in the bit field.

For a common enumeration object, the output description is as follows:

  Public   Enum   Status {[description ( "   normal  "  )] Normal  =- 1  , [description ( "   Delete  "  )] deletet  =  0  , [description ( "   freeze  "  )] freezed  =  1  ,} 

Status status =Status. Normal; console. writeline (status. getdescription ());
 

For enumeration that supports the bit field flags featureGetdescriptionMethods cannot be implemented. We need to make some modifications to them.

 [Flags]  Public   Enum  Ball {[description (  "  Football  "  )] Football = 1  , [Description (  "  Basketball "  )] Basketball = 2  , [Description (  "  Table Tennis  "  )] Pingpang = 4  ,} 

     ///   <Summary>      ///  Enumeration type Extension Method  ///   </Summary>     Public   Static   Class  Enumextensions {  ///   <Summary>          ///  Obtains the enumeration set of the flags feature.  ///   </Summary>          ///   <Param name = "value"> </param>          ///   <Returns> </returns>          Static List <Enum>Getenumvaluesfromflagsenum (Enum value) {list <Enum> values = enum. getvalues (value. GetType (). Cast <Enum> (). Tolist (); List <Enum> res = New List <Enum> ();  Foreach ( VaR Itemvalue In  Values ){  If (Value. gethashcode () & itemvalue. gethashcode ())! = 0 ) Res. Add (itemvalue );}  Return  Res ;}  ///   <Summary>            ///  Obtains the description attribute of the enumerated variable value.  ///   </Summary>            ///   <Param name = "OBJ">  Enumerated variable  </Param>            ///   <Returns> If the description attribute is included, the value of the description attribute is returned. Otherwise, the name of the enumerated variable value is returned.  </Returns>            Public   Static   String Getdescription ( This  Enum OBJ ){  String Description = String  . Empty;  Try  {Type _ enumtype = OBJ. GetType (); descriptionattribute DNA = Null  ; Fieldinfo fi = Null  ;  VaR Fields = _ Enumtype. getcustomattributesdata ();  If (! Fields. Where (I => I. constructor. declaringtype. Name = "  Flagsattribute  "  ). Any () {fi =_ Enumtype. getfield (enum. getname (_ enumtype, OBJ); DNA = (Descriptionattribute) attribute. getcustomattribute (FI, Typeof  (Descriptionattribute ));  If (DNA! = Null && String . Isnullorempty (DNA. Description) = False  )  Return  DNA. description;  Return  Null  ;} Getenumvaluesfromflagsenum (OBJ). tolist (). foreach (I => {Fi = _ Enumtype. getfield (enum. getname (_ enumtype, I); DNA = (Descriptionattribute) attribute. getcustomattribute (FI, Typeof  (Descriptionattribute ));  If (DNA! = Null && String . Isnullorempty (DNA. Description) = False ) Description + = DNA. Description + "  ,  "  ;});  Return Description. endswith ( "  ,  "  ) ? Description. Remove (description. lastindexof ( '  ,  ' ): Description ;}  Catch  {  Throw  ;}}} 

After it is assigned a value, the output is as follows:

 
Ball ball = ball. Basketball | ball. Football;
Console. writeline (ball. getdescription ());
 

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