The Fluent API HasField Method

The Entity Framework Core Fluent API HasField method configures a backing field as part of the model. The backing field will be read from and written to, instead of the property. You will use the HasField method when the name of the backing field doesn't match one of the conventions.

In the following example, the RecommendedRetailPrice property has a backing field named rrp, which will not be discovered by convention:

public class Book
    private decimal rrp;
    public int BookId { get; set; }
    public string Title { get; set; }
    public int PublisherId { get; set; }
    public Publisher Publisher { get; set; }
    public decimal RecommendedRetailPrice {
        get { return rrp; }
        set { rrp = value; }

The next example illustrates the use of HasField to configure the backing field as part of the model:

protected override void OnModelCreating(ModelBuilder modelBuilder)
    modelBuilder.Entity<Book>().Property(p => p.RecommendedRetailPrice).HasField("rrp");

Data Annotations

There is no Data Annotation equivalent to the HasField method.

Last updated: 8/13/2019 3:27:22 AM