c# - 如何在 EF Core 中使用 backingfield 存储数据？

Question

我有以下课程

public class InvestorsLottery : Lottery 
{
    [Column(TypeName = "decimal(14, 2)")]
    public decimal Investment { get; set; }
    [Required]
    public int Percentage { get; set; }
    [Required]
    [Column(TypeName = "decimal(30, 18)")]
    public decimal InvestmentEth 
    { 
        get { return _investmentEth; } 
        set { 
             _investmentEth = Investment / EthPrice; 
             value = _investmentEth
        } 
    }
    private decimal _investmentEth;
}

使用以下流利的api

protected override void OnModelCreating(ModelBuilder builder)
{
    base.OnModelCreating(builder);

    builder.Entity<InvestorsLottery>()
           .Property(p => p.InvestmentEth)
           .HasField("_investmentEth")
           .UsePropertyAccessMode(PropertyAccessMode.Field);
}

但是 InvestmentEth 的价值保持为零——我该如何改变呢？