How to pass string variables to JObject C# - Could not load file or assembly 'System.Text.Json

Question

Good day, I need to assign variables to JObject:

JObject json = JObject.Parse(@"{
RequestData: {
  AccountCredential: {
    AccountLink: 'dFyRCVYNM0aGb1LSR/0B8e+eSVr1Zf1xj9YHmMVoiZWk28XtWEyIxEbGXnr1EdvS+QBPzjweau7tbf5QlDv97IQ2jwfUB=='
  },
  AccountNumber: '000011887755',
  BookingDateStart: '2022-07',
  BookingDateEnd: '2022-07'
}  }");

I want to pass values ​​to AccountLink, AccountNumber, BookingDateStart, BookingDateEnd. If you notice, I set the values ​​to hard, but these change, where I should use it by passing the parameters.

I have tried to use the JsonSerializerOptions, but I get an error

Could not load file or assembly 'System.Text.Json'

I want to be able to use it in an asynchronous task.

Does anyone have any ideas? Your help is appreciated.

Answer 1

There are two major C# JSON libraries: Newtonsoft.Json and System.Text.Json. JObject is a class from the former, and JsonSerializerOptions is a class from the latter. You can't just mix them together. If you want to modify Newtonsoft.Json serialization, you need to look up how to do that in Netwonsoft.Json.

---

That having been said, you don't need a serializer for what you are trying to do. Creating a JObject from variable data is simple in Netwonsoft.Json. Your code would look similar to that (fiddle):

    var json = new JObject(
        new JProperty("RequestData",
            new JObject(
                new JProperty("AccountCredential", 
                    new JObject(
                        new JProperty("AccountLink", "...")
                    )
                ),
                new JProperty("AccountNumber", "..."),
                new JProperty("BookingDateStart", "..."),
                new JProperty("BookingDateEnd", "...")
            )
        )
    );

Just replace "..." with the value you want to fill your JObject with.