Microsoft.EntityFrameworkCore dont have method IsOptional() for PropertyBuilder

I try transfer my solution from .Net Framowork to .Net Core.When I did mapping and I dint found method IsOptional() for PropertyBuilder:

.Net Framowork:

public class PictureMap : EntityTypeConfiguration<PictureExt>

public PictureMap()

this.ToTable("Picture");
this.HasKey(p => p.Id);
this.Property(p => p.SeoFilename).HasMaxLength(300);
this.Property(p => p.ExternalUrl).IsOptional();




and its work , but use EntityFrameworkCore:look in image

where I might found IsOptional()?

2 Answers
2

There is not IsOptional in EntityFrameworkCore but there is IsRequired to do the oposite. By default field are nullable if the C# type is nullable.

IsOptional

IsRequired

You can achieve the same effect with IsRequired(false). This will override annotations like [Required] so be careful. On another thread, it was pointed out that annotations that affect EF models or make no sense [Display...] should not be part of the EF model. Move them to a ViewModel or DTO object.

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