Hands-On RESTful Web Services with ASP.NET Core 3

Custom conversions using the Fluent API

EF Core also provides a way to add custom conversions. This approach may be useful for providing a custom representation of complex entities. As an example, let's take the following snippet of code declared in ItemEntitySchemaDefinition:

            builder.Property(p => p.Price).HasConversion(                p => $"{p.Amount}:{p.Currency}",                p => new Price                {                    Amount = Convert.ToDecimal(p.Split(':',                      StringSplitOptions.None)[0]),                    Currency = p.Split(':', StringSplitOptions.None)[1]                });

The HasConversion method offers a way to customize data inserted into the database. This method serializes the Price field, which is of the Price type, into a string by using the following format: 34.05:EUR. On the other hand, when the Price data ...