C#•2y 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•2y 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

AllanOP•2y ago

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

Esa•2y ago

What do you mean with unpredictable?

ero•2y ago

The JsonElement will still know

MODiX•2y 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.

AllanOP•2y 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•2y 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

AllanOP•2y 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•2y 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

AllanOP•2y ago

Nope

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

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

I can't ever know what's inside data

ero•2y ago

then how do you expect to use it?

AllanOP•2y ago

I'm not using it

ero•2y ago

then why do you care about it?

AllanOP•2y ago

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

ero•2y ago

right this seems at least somewhat like an xy problem

AllanOP•2y 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•2y 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•2y ago

hmm hm?

AllanOP•2y ago

mh Why do I have a different output 👀

ero•2y ago

iunno

AllanOP•2y ago

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

ero•2y ago

share your code

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Serialize a JsonDocument/JsonElement with STJ