delphi泛型实现的变体记录

type
  TRes = record                  //公共的JSON回复
    status: Integer;
    message: string;
    exception: string;
  end;

  TData<T: record> = record
    data: array of T;
  end;

  TDatas<T: record> = record
    res: TRes;
    data: array of T;
  end;

type      //定义 数据模型
  Tdanwei = record
    unitid: string;
    unitname: string;
  end;

var dw: TData<Tdanwei> := TSerial.unmarshal<TData<Tdanwei>>(TStream(req.Body));