C#•17mo ago

Serialize a JsonDocument/JsonElement with STJ

I have a class with an object property. When deserializing something into this class, it deserializes it as a JsonElement. When trying to serialize it back to raw JSON, it will serialize the actual properties of JsonElement or JsonDocument... Any idea?

22 Replies

ero•17mo ago

JsonElement comes with an ElementType (or something of the sort) property You'll want to check that, and then use the GetX methods accordingly

Allan•17mo ago

I don’t know what’s inside that JSON That’s the issue It’s an unpredictable object

Esa•17mo ago

What do you mean with unpredictable?

ero•17mo ago

The JsonElement will still know

MODiX•17mo ago

Ero#1111

REPL Result: Success

using System.Text.Json;

var json1 = """
{
  "Bar": 123
}
""";

var json2 = """
{
  "Bar": "Qux"
}
""";

var foo1 = JsonSerializer.Deserialize<Foo>(json1);
var foo2 = JsonSerializer.Deserialize<Foo>(json2);

var je1 = (JsonElement)foo1.Bar;
var je2 = (JsonElement)foo2.Bar;

Console.WriteLine((je1.ValueKind, je2.ValueKind));

record Foo(
object Bar);

using System.Text.Json;

var json1 = """
{
  "Bar": 123
}
""";

var json2 = """
{
  "Bar": "Qux"
}
""";

var foo1 = JsonSerializer.Deserialize<Foo>(json1);
var foo2 = JsonSerializer.Deserialize<Foo>(json2);

var je1 = (JsonElement)foo1.Bar;
var je2 = (JsonElement)foo2.Bar;

Console.WriteLine((je1.ValueKind, je2.ValueKind));

record Foo(
object Bar);

Console Output

(Number, String)

(Number, String)

Compile: 728.328ms | Execution: 81.792ms | React with ❌ to remove this embed.

Allan•17mo ago

That means I have to reinvent the wheel just because it’s not a concrete type? Cause right I have that cool JsonElement but using Serialize on foo1 or foo2 won’t serialize it back properly And so should I make a converter for this?

ero•17mo ago

you're forced to use a converter, yes if it truly is an object and not a concrete type, then you just got unlucky i guess get mad at the people who provide the json data

Allan•17mo ago

Yeah... The data come from some JavaScript library, they do clown things there Thank you then, I'll roll a converter for this. I'm pretty sure a dynamic converter for this could be built in in the library though... I don't think I ever had that kind of issues with Json.Net

ero•17mo ago

do you ever know the type upfront? like if you for example get the data from this one endpoint, it'll be that type, if you get it from another endpoint, it'll be another type

Allan•17mo ago

Nope

{
  width,
  height,
  ...,
  data : { ??? }
}

{
  width,
  height,
  ...,
  data : { ??? }
}

I can't ever know what's inside data

ero•17mo ago

then how do you expect to use it?

Allan•17mo ago

I'm not using it

ero•17mo ago

then why do you care about it?

Allan•17mo ago

I'm persisting it in a MSSQL database then giving it back whenever someone asks me to

ero•17mo ago

right this seems at least somewhat like an xy problem

Allan•17mo ago

Could be yes 🙄 The converter is gonna be fine I guess anyway, I just wanted not to do one if there's a built-in solution to the issue

MODiX•17mo ago

Ero#1111

REPL Result: Success

using System.Text.Json;

var json = """
{
  "Bar": {
    "Qux": "Quo"
  }
}
""";

var foo = JsonSerializer.Deserialize<Foo>(json);

Console.WriteLine(JsonSerializer.Serialize(foo));

record Foo(
object Bar);

using System.Text.Json;

var json = """
{
  "Bar": {
    "Qux": "Quo"
  }
}
""";

var foo = JsonSerializer.Deserialize<Foo>(json);

Console.WriteLine(JsonSerializer.Serialize(foo));

record Foo(
object Bar);

Console Output

{"Bar":{"Qux":"Quo"}}

{"Bar":{"Qux":"Quo"}}

Compile: 772.990ms | Execution: 134.501ms | React with ❌ to remove this embed.

ero•17mo ago

hmm hm?

Allan•17mo ago

mh Why do I have a different output 👀

ero•17mo ago

iunno

Allan•17mo ago

https://images-ext-2.discordapp.net/external/ufDdSC3rc1Fjqei3LmznpCLm5nP8E-cbOG73M2_LBnk/https/i.alnmrc.com/72e732c13d2c49f79026525cc636df82.png

ero•17mo ago

share your code

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Serialize a JsonDocument/JsonElement with STJ