C#•9mo ago

✅ Can the NewtonSoft JSON package conditionally create classes when parse?

I have a situation where a field in a class will sometimes have a string, but other times have a class instance. Is there a way to have the JSON serializer wrap the string in something so the field doesn't have to be just object? It might work out that the string is just a shorthand way of saying "default all other fields in the class instance."

14 Replies

TheRanger•9mo ago

something like what?

Will Pittenger•9mo ago

Well, examine this:

[
  {
    "t": "ss"
  },
  {
    "t":
    {
      "wrapped": "value",
      "some other value": "value2"
    }
  }
]

[
  {
    "t": "ss"
  },
  {
    "t":
    {
      "wrapped": "value",
      "some other value": "value2"
    }
  }
]

In the first entry, some other value is defaulted to some value.

TheRanger•9mo ago

yeah so you want it to create an instance of a class when its not a string, right? you can do that

Will Pittenger•9mo ago

I want to create the class instance even when it is a string.

TheRanger•9mo ago

when is what a string, the field? or the value in the json?

Will Pittenger•9mo ago

If in the JSON t is a string, wrap the string in the class.

TheRanger•9mo ago

ok yeah u can do that look up JsonConverter Attribute

Will Pittenger•9mo ago

So that array would be as though the following was in the JSON.

[
  {
    "t": 
    {
      "wrapped": "ss",
      "some other value": "default"
  },
  {
    "t":
    {
      "wrapped": "value",
      "some other value": "value2"
    }
  }
]

[
  {
    "t": 
    {
      "wrapped": "ss",
      "some other value": "default"
  },
  {
    "t":
    {
      "wrapped": "value",
      "some other value": "value2"
    }
  }
]

TheRanger•9mo ago

https://www.newtonsoft.com/json/help/html/CustomJsonConverter.htm or the generic version is probably better https://www.newtonsoft.com/json/help/html/CustomJsonConverterGeneric.htm alternatively u can define an explicit operator Bar that takes a string newton can detect it and convert the string into bar

Will Pittenger•9mo ago

I didn't know if the parser would observe that.

TheRanger•9mo ago

the explicit operator choice looks easier

Will Pittenger•9mo ago

Well, the operator won't help. The instance in the array needs a parent back to the owner. It also be more like this:

[
  "ss",
  {
    "wrapped": "value",
    "some other value": "value2"
  }
]

[
  "ss",
  {
    "wrapped": "value",
    "some other value": "value2"
  }
]

That'd produce the same result as:

[
  {
    "wrapped": "ss",
    "some other value": "default"
  },
  {
    "wrapped": "value",
    "some other value": "value2"
  }
]

[
  {
    "wrapped": "ss",
    "some other value": "default"
  },
  {
    "wrapped": "value",
    "some other value": "value2"
  }
]

Will Pittenger•9mo ago

For more on that problem, see https://discord.com/channels/143867839282020352/1157109068423507988.

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Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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✅ Can the NewtonSoft JSON package conditionally create classes when parse?