FMX: TBitmap.Assign Methode erscheint mir nicht korrekt

[Schokohase]

Du meinst dein Assign sieht ungefähr so aus?

Delphi-Quellcode:

program Project1;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.Classes,
  System.SysUtils;

type
  TMyClass = class( TPersistent )
  private
    FData: string;
  public
    procedure Assign( Source: TPersistent ); override;
  public
    property Data: string read FData write FData;
  end;

procedure TMyClass.Assign( Source: TPersistent );
begin
  if ( Source is TMyClass ) then
  begin
    FData := TMyClass( Source ).FData;
  end
  else
    inherited;
end;

var
  a, b: TMyClass;

begin
  try
    a := nil;
    b := nil;
    try
      a := TMyClass.Create();
      b := TMyClass.Create();

      a.Data := 'Foo';
      b.Assign(a);
      WriteLn(b.Data);

    finally
      a.Free;
      b.Free;
    end;
  except
    on E: Exception do
      Writeln( E.ClassName, ': ', E.Message );
  end;
end.