Asp.net core 2.0 comma and point decimal separator

Question

I tried to make an attempt of a basic project Core 2 with just a model:

public class Bilance 
{ 
    [Key] 
    public int Id { get; set; } 

    [Required] 
    public decimal Amount{ get; set; } // (sql 18,2) 
}

I used this Custom Model Binding to use the comma as decimal seperator but it doesn't work. (Aspnet Core Decimal binding not working on non English Culture)

Works with a few numbers (123,456) with others no (11,50... 1520,77)

Could you help me? Thanks