I have a class called Client mapped to a database table using Entity Framework code first. The table has a computed field that I need available in my Client class, but I understand that it won't be possible to write to this field. Is there a way of configuring Entity Framework to ignore the property when saving, but include the property when reading?
I have tried using the Ignore method in my configuration class, or using the [NotMapped] attribute, but these prevent the property from being read from the database.
You can use DatabaseGeneratedAttribute
with DatabaseGeneratedOption.Computed
option:
[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
public ComputedPropertyType ComputedProperty { get; set; }
or if you prefer fluent api you can use HasDatabaseGeneratedOption
method in your DbContext
class:
public class EntitiesContext : DbContext
{
public DbSet<EntityType> Enities { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<EntityType>().Property(e => e.ComputedProperty).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed);
}
}
Mark property as computed:
modelBuilder
.Entity<MyEntityType>()
.Property(_ => _.MyProperty)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed);
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