ef core自动映射

时间:2022-04-26 08:53:15

原回答:https://*.com/questions/26957519/ef-core-mapping-entitytypeconfiguration

反射

protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder); // Interface that all of our Entity maps implement
var mappingInterface = typeof(IEntityTypeConfiguration<>); // Types that do entity mapping
var mappingTypes = typeof(DataContext).GetTypeInfo().Assembly.GetTypes()
.Where(x => x.GetInterfaces().Any(y => y.GetTypeInfo().IsGenericType && y.GetGenericTypeDefinition() == mappingInterface)); // Get the generic Entity method of the ModelBuilder type
var entityMethod = typeof(ModelBuilder).GetMethods()
.Single(x => x.Name == "Entity" &&
x.IsGenericMethod &&
x.ReturnType.Name == "EntityTypeBuilder`1"); foreach (var mappingType in mappingTypes)
{
// Get the type of entity to be mapped
var genericTypeArg = mappingType.GetInterfaces().Single().GenericTypeArguments.Single(); // Get the method builder.Entity<TEntity>
var genericEntityMethod = entityMethod.MakeGenericMethod(genericTypeArg); // Invoke builder.Entity<TEntity> to get a builder for the entity to be mapped
var entityBuilder = genericEntityMethod.Invoke(builder, null); // Create the mapping type and do the mapping
var mapper = Activator.CreateInstance(mappingType);
mapper.GetType().GetMethod("Map").Invoke(mapper, new[] { entityBuilder });
}
}

其他 ef core的方法

class CustomerConfiguration : IEntityTypeConfiguration<Customer>
{
public void Configure(EntityTypeBuilder<Customer> builder)
{
builder.HasKey(c => c.AlternateKey);
builder.Property(c => c.Name).HasMaxLength();
}
} ...
// OnModelCreating
builder.ApplyConfiguration(new CustomerConfiguration());