唯一约束不适用于实体框架核心

Question

我正在使用Entity Framework Core 2.2.6，并且我有两个实体Profile和Category。每个Category将具有ProfileId来标识它属于哪个Profile。我试图对Name中的ProfileId和Category强制执行唯一性。但是我唯一的约束失败了。

这是我的实体，

BaseEntity：

public class BaseEntity<TKey>
{
    public TKey Id { get; set; }
    public bool Active { get; set; }
    public DateTimeOffset CreatedAt { get; set; }
    public string CreatedBy { get; set; }
    public DateTimeOffset? ModifiedAt { get; set; }
    public string ModifiedBy { get; set; }
}

个人资料：

public class Profile : BaseEntity<Guid>, IAggregateRoot
{
    private Profile()
    {
        // required by EF
    }

    public Profile(string brandName)
    {
        Guard.Against.NullOrEmpty(brandName, nameof(brandName));
        BrandName = brandName;
    }

    public string BrandName { get; set; }
    public string Caption { get; set; }
}

类别：

public class Category : BaseEntity<Guid>, IAggregateRoot
{
    private Category()
    {
        // required by EF
    }

    public Category(string name)
    {
        Guard.Against.NullOrEmpty(name, nameof(name));
        Name = name;
    }

    public Category(string name, string code) : this(name)
    {
        Guard.Against.NullOrEmpty(code, nameof(code));

        Code = code;
    }

    public string Name { get; set; }
    public string Code { get; set; }

    public Guid ProfileId { get; set; }
}

类别实体配置：

public class CategoryConfiguration : IEntityTypeConfiguration<Category>
{
    public void Configure(EntityTypeBuilder<Category> builder)
    {
        builder.HasAlternateKey(c => new { c.ProfileId, c.Name });
        // builder.HasIndex(c => new { c.ProfileId, c.Name }).IsUnique();

        builder.Property(c => c.Name)
            .IsRequired()
            .HasMaxLength(50);

        builder.Property(c => c.Code)
            .HasMaxLength(10);

        builder.HasOne<Profile>()
             .WithMany()
             .HasForeignKey(p => p.ProfileId)
             .IsRequired();
    }
}

我尝试了builder.HasAlternateKey(c => new { c.ProfileId, c.Name });和builder.HasIndex(c => new { c.ProfileId, c.Name }).IsUnique();。但是两者似乎都不起作用。请帮我解决问题吗？