delphi – 是否有可能获得类属性的索引?
发布时间:2020-12-15 04:34:07 所属栏目:大数据 来源:网络整理
导读:type TMyClass = class ... public ... property P1: Integer Index 1 read GetInteger write SetInteger; property P2: Integer Index 2 read GetInteger write SetInteger; property P3: Integer Index 3 read GetInteger write SetInteger; ... end; 是否
type TMyClass = class ... public ... property P1: Integer Index 1 read GetInteger write SetInteger; property P2: Integer Index 2 read GetInteger write SetInteger; property P3: Integer Index 3 read GetInteger write SetInteger; ... end; 是否有可能获得类属性的索引?例如,像 I := IndexOfProperty(TMyClass.P2); 解决方法
您可以使用RTTI获取属性的索引.根据您的Delphi版本,您可以使用GetPropInfo方法(仅适用于已发布的属性)或通过TRttiInstanceProperty类访问此类信息
试试这个样本. {$APPTYPE CONSOLE} uses Rtti,SysUtils,TypInfo; type TMyClass = class private function GetInteger(const Index: Integer): Integer; procedure SetInteger(const Index,Value: Integer); public property P1: Integer Index 1 read GetInteger write SetInteger; property P2: Integer Index 2 read GetInteger write SetInteger; property P3: Integer Index 3 read GetInteger write SetInteger; end; { TMyClass } function TMyClass.GetInteger(const Index: Integer): Integer; begin end; procedure TMyClass.SetInteger(const Index,Value: Integer); begin end; var LRttiInstanceProperty : TRttiInstanceProperty; LRttiProperty : TRttiProperty; Ctx: TRttiContext; LPropInfo : PPropInfo; begin try LPropInfo:= GetPropInfo(TMyClass,'P1'); //only works for published properties. if Assigned(LPropInfo) then Writeln(Format('The index of the property %s is %d',[LPropInfo.Name,LPropInfo.Index])); Ctx:= TRttiContext.Create; try LRttiProperty:= Ctx.GetType(TMyClass).GetProperty('P2'); if Assigned(LRttiProperty) and (LRttiProperty is TRttiInstanceProperty) then begin LRttiInstanceProperty := TRttiInstanceProperty(LRttiProperty); Writeln(Format('The index of the property %s is %d',[LRttiProperty.Name,LRttiInstanceProperty.Index])); end; finally Ctx.Free; end; except on E:Exception do Writeln(E.Classname,':',E.Message); end; Writeln('Press Enter to exit'); Readln; end. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |