The JSON value could not be converted to System.Int32

Question

I want to send data of object to my Web API. The API accepts a parameter of class, which properties are type of int and string.

This is my class:

publi         


        

Answer 1

First you should create a JsonConverter for it:

using System;
using System.Buffers;
using System.Buffers.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace sample_22_backend.Converters
{
    public class IntToStringConverter : JsonConverter
    {
        public override int Read(ref Utf8JsonReader reader, Type type, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.String)
            {
                ReadOnlySpan span = reader.HasValueSequence ? reader.ValueSequence.ToArray() : reader.ValueSpan;
                if (Utf8Parser.TryParse(span, out int number, out int bytesConsumed) && span.Length == bytesConsumed)
                {
                    return number;
                }

                if (int.TryParse(reader.GetString(), out number))
                {
                    return number;
                }
            }

            return reader.GetInt32();
        }

        public override void Write(Utf8JsonWriter writer, int value, JsonSerializerOptions options)
        {
            writer.WriteStringValue(value.ToString());
        }
    }
}

Then use it this way on your model's properties:

[JsonConverter(typeof(IntToStringConverter))]
public int GenreId { set; get; }

Or you can add it globally:

services.AddControllers()
        .AddJsonOptions(options => 
                options.JsonSerializerOptions.Converters.Add(new IntToStringConverter()));