Error: The json property name for collides with another property in .Net 6

Dung Do Tien May 21 2022 263

Hi Guys, I am a developer in .Net and I have a project that needs to maintain and upgrade from .net core 3.1 to .net 6. 

After upgrading and building all successed. I run the app but have an exception threw: System.InvalidOperationException: The json property name for "model.BooksModel.BookName" collides with another property.

System.InvalidOperationException: The json property name for "model.BooksModel.BookName" collides with another property.
 at System.Text.Json.ThrowHelper.ThrowInvalidOperationException_SerializerPropertyNameConflict(Type type, .....)
 at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CacheMember()
 at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CacheMember(Type declaringType)
 at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type)
 at System.Text.Json.JsonSerializerOption.<Initial...>
 at System.Text.Json.JsonSerializerOption.GetOrAddClass(Type type)
 at System.Text.Json.JsonSerializerOption.GetTypeInfo(Type runtimeType)
 

Here is my code :

public async Task<IEnumerable<BooksModel>> Books(int storeId)
{
   try{
       var books = await _context.Books.Where(a => a.StoreId == storeId).ToListAsync();
        return contacts;
   }
   catch(Exception ex){
      return null;
   }
}

public class BooksModel{
    public int Id { get; set; }
    public string BookName { get; set; }
    public string bookname { get; set; }
    public string Author { get; set; }
    public float Price { get; set; }
    public DateTime PublishDate { get; set; }
}

I don't know why book modes had two bookname properties. I research on google and added the config below into Startup.cs, ConfigurationServices() method: 

services.AddControllers().AddJsonOptions(options =>
    { options.JsonSerializerOptions.PropertyNameCaseInsensitive = true; });

Anyone can help me with this.

Thanks in advance

Have 1 answer(s) found.
  • P

    Prekshi Gupta May 21 2022

    Please don't enable case sensitive for JSON. You can set it like this:

    services.AddControllers().AddJsonOptions(options =>
        { options.JsonSerializerOptions.PropertyNameCaseInsensitive = false; });

    And add JsonPropertyName to help define names for duplicate properties, like this:

    public class BooksModel{
        public int Id { get; set; }
        
        [JsonPropertyName("BookName")]
        public string BookName { get; set; }
        
        [JsonPropertyName("bookname")]
        public string bookname { get; set; }
        
        public string Author { get; set; }
        
        public float Price { get; set; }
        
        public DateTime PublishDate { get; set; }
    }

    And it will solve the issues for you.

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