Beispiel #1
0
        static void Main(string[] args)
        {
            Ticket tick1 = new Ticket(1, "09-04-2020", 1, "A", 15);
            Ticket tick2 = new Ticket(1, "09-04-2020", 1, "A", 16);
            Ticket tick3 = new Ticket(1, "09-04-2020", 1, "A", 17);

            JsonSerializerOptions options = new JsonSerializerOptions
            {
                WriteIndented            = true,
                IgnoreNullValues         = true,
                IgnoreReadOnlyProperties = true
            };


            //STORE JSON OBJECT
            var jsonString = JsonSerializer.Serialize(new Ticket[] { tick1, tick2, tick3 }, options);

            Console.WriteLine(jsonString);
            File.WriteAllText("data.json", jsonString);


            //READ AND UPDATE JSON OBJECT
            string        jsonText = File.ReadAllText("data.json");
            List <Ticket> tickets  = new List <Ticket>();

            using (JsonDocument document = JsonDocument.Parse(jsonString))
            {
                JsonElement root = document.RootElement;
                JsonElement ticketsArrayElement = root;

                foreach (JsonElement ticket in ticketsArrayElement.EnumerateArray())
                {
                    //Make .NET object is values are present in JSON
                    if (ticket.TryGetProperty("Price", out JsonElement PriceElement) &&
                        ticket.TryGetProperty("Date", out JsonElement DateElement) &&
                        ticket.TryGetProperty("TheaterNumber", out JsonElement TheaterElement) &&
                        ticket.TryGetProperty("SeatNumber", out JsonElement SeatElement) &&
                        SeatElement.TryGetProperty("Row", out var RowElement) && SeatElement.TryGetProperty("Seat", out var SeatNumElement)
                        )
                    {
                        int    price         = PriceElement.GetInt32();
                        string date          = DateElement.GetString();
                        int    theaterNumber = TheaterElement.GetInt32();
                        string row           = RowElement.GetString();
                        int    seat          = SeatNumElement.GetInt32();

                        tickets.Add(new Ticket(price, date, theaterNumber, row, seat));
                    }
                }
            }

            tickets[0].Date = "DATE HAS BEEN MODIFIED";

            jsonText = JsonSerializer.Serialize(tickets, options);
            File.WriteAllText("data.json", jsonText);
        }