EF唯一索引

this.Property(p => p.Name)
                .IsRequired()
                .HasMaxLength(new int?())
                .HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute("UX_Role_Name") { IsUnique=true}));

using System.ComponentModel.DataAnnotations.Schema;

[Index(IsUnique = true)]

[ForeignKey(nameof(SchoolId))]