C#•2y ago

Error with creating JSON object.

I am trying to deserialize a JSON file. I created the file myself. I am getting this error when I try to deserialize it. I am able to read the file as normal and output its contents, but when I try to create an object from it, it errors out. There are no "/" in the file. This is my call. It errors out on the second line.

string json = "moves.json"; //Actual filepath is hardcoded
var moves = JsonSerializer.Deserialize<List<Moves>>(json);

string json = "moves.json"; //Actual filepath is hardcoded
var moves = JsonSerializer.Deserialize<List<Moves>>(json);

This is the object class.

using System;
namespace ok
{
    public class Moves
    {
        public string Name { get; set; }
        public string Type { get; set; }
        public int Attack { get; set; }
        public int Accuracy { get; set; }
    }
}

using System;
namespace ok
{
    public class Moves
    {
        public string Name { get; set; }
        public string Type { get; set; }
        public int Attack { get; set; }
        public int Accuracy { get; set; }
    }
}

This is an example of my JSON.

{
  "Moves": [
    {
      "Name": "Leech Life",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 100
    },
    {
      "Name": "Pin Missile",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 85
    }
  ]
}

{
  "Moves": [
    {
      "Name": "Leech Life",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 100
    },
    {
      "Name": "Pin Missile",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 85
    }
  ]
}

3 Replies

ero•2y ago

That json is not a List<Move>

MODiX•2y ago

Ero#1111

REPL Result: Success

using System.Text.Json;

var json = """
{
  "Moves": [
    {
      "Name": "Leech Life",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 100
    },
    {
      "Name": "Pin Missile",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 85
    }
  ]
}
""";

var root = JsonSerializer.Deserialize<Root>(json);
Console.WriteLine(root);

record Root(
Move[] Moves);

record Move(
string Name,
string Type,
int Attack,
int Accuracy);

using System.Text.Json;

var json = """
{
  "Moves": [
    {
      "Name": "Leech Life",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 100
    },
    {
      "Name": "Pin Missile",
      "Type": "BUG",
      "Attack": 15,
      "Accuracy": 85
    }
  ]
}
""";

var root = JsonSerializer.Deserialize<Root>(json);
Console.WriteLine(root);

record Root(
Move[] Moves);

record Move(
string Name,
string Type,
int Attack,
int Accuracy);

Console Output

Root { Moves = Submission#0+Move[] }

Root { Moves = Submission#0+Move[] }

Quoted by

<@!542772576905199626> from #help-0 (click here)

Compile: 725.784ms | Execution: 137.506ms | React with ❌ to remove this embed.

Cvfe Cvt ᵖᵘʳʳOP•2y ago

Oh, I think I understand. So I would need to remove the moves: statement at the beginning to make it into a List? The moves word only occurs at the very beginning. I thought that was needed, but I guess the class itself or moreso the deserializer decides the type. That was it. The error was because I was reading the string name of the filepath. That explains the "/" error. After removing the Moves : and an extra set of brackets, it parsed. Thank you.

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Error with creating JSON object.