using System;

using System.Text.Json;

using System.Text.Json.Serialization;

​

var json = @"[

    {

        ""name"": ""Luke Skywalker"",

        ""height"": ""172"",

        ""mass"": ""77"",

        ""birth_year"": ""19BBY"",

        ""gender"": ""male""

    }

]";

var options = new JsonSerializerOptions()

{PropertyNameCaseInsensitive = true, NumberHandling = JsonNumberHandling.AllowReadingFromString, Converters = {new BirthYearConverter(), }};

var deserialize = JsonSerializer.Deserialize<Character[]>(json, options);

Console.WriteLine(deserialize[0].Weight);

record class Character

{

    public string Name { get; init; } = "";

    [property: JsonPropertyName("birth_year")]

    public double Birth { get; init; }

​

    public int Height { get; init; }

​

    [property: JsonPropertyName("mass")]

    public int Weight { get; init; }

}

​

class BirthYearConverter : JsonConverter<double>

{

    public override double Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)

    {

        return double.TryParse(reader.GetString()?.TrimEnd('B', 'b', 'Y', 'y'), out double result) ? result : 0;

    }

​

    public override void Write(Utf8JsonWriter writer, double value, JsonSerializerOptions options)

    {

        throw new NotImplementedException();

    }

}