TJson.Deserialize Problem

[Kaeswurm_Thomas (Thomas Kaeswurm)]

I get the exceptipn:

JsonConverterNotFound
"Could not find JSON converter for type "Nullable<System.string>""

I call:

LEvent := TJson.Deserialize(AsngParam.JSONData.ToString);

JSON-Data as String:
{
"EventID":"00000000-0000-0000-0000-000000000001",
"ProducerID":"00000000-0000-0000-0000-000000000003",
"Producername":"xxx",
"Name":"yxy",
"Notification":false
}

Entity type:

  TPubEvent = class
  private
    [Column('evt_id', [TColumnProp.Required])]
    FEventID: TGuid;
    
    [Column('evt_producer', [TColumnProp.Required])]
    FProducerID: TGuid;
    
    [Column('evt_producername', [], 80)]
    FProducername: Nullable;
    
    [Column('evt_name', [TColumnProp.Required], 160)]
    FName: string;
    
    [Column('evt_notification', [TColumnProp.Required])]
    FNotification: Boolean;

Isn't it possible to use Nullable Strings?

[wlandgraf (Wagner Landgraf)]

Only if you use XData serializer:

uses
  Aurelius.Json.Converter;



procedure TForm4.Button1Click(Sender: TObject);
var
  Event: TPubEvent;
  Deserializer: TAureliusJsonDeserializer;
begin
  Deserializer := TAureliusJsonDeserializer.Create(TMappingExplorer.Default);
  try
    Event := Deserializer.Read<TPubEvent>(Memo1.Lines.Text);
  finally
    Deserializer.Free;
  end;
end;

[Kaeswurm_Thomas (Thomas Kaeswurm)]

Ok, but now I get an error on EventID: TGuid

"InvalidJsonProperty",
"Property "EventID" does not refer to a known property in type "Pub.dbEntities.TPubEvent""

But it's no problem for me to write my own Create-Function.
I don't really need a deserializer

[Kaeswurm_Thomas (Thomas Kaeswurm)]

Why is a rectangle around my text in tghe posting before:
I don't make it

[wlandgraf (Wagner Landgraf)]

If EventID is just a private field, it's possible that it was removed from the linker. Also pay attention that it's case-sensitive, EventID is different from EventId.