c# – 必须是不可为空的才能用作参数’T’

.MTObject' must be a non-nullable value type in order to use it as
parameter ‘T’ in the generic type or method
‘System.Data.Entity.ModelConfiguration.Configuration.StructuralTypeConfiguration<TStructuralType>.Property<T>(System.Linq.Expressions.Expression<System.Func<TStructuralType,T>>)‘

有没有办法声明我的类属性来解决这个错误？

代码如下：

// Simple Example

public class MTObject
{
    public string Object { get; set; }

    public MTObject()
    {

    }
}

public class Person
{
    public decimal Id { get; set; }

    //public string Name { get; set; }

    public MTObject Name { get; set; }

    public Int32 Age { get; set; }
}

public class PersonConfiguration : EntityTypeConfiguration<Person>
{
    public PersonConfiguration() : base()
    {
        HasKey(p => p.Id);
        Property(p => p.Id).HasColumnName("ID").HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        Property(p => p.Name).HasColumnName("NAME").IsOptional();
        Property(p => p.Age).HasColumnName("AGE").IsOptional();
        ToTable("Person");
    }
}

public class PersonDataBase : DbContext
{
    public DbSet<Person> Persons { get; set; }

    public PersonDataBase(string connectionString) : base(connectionString)
    {
        Database.CreateIfNotExists();
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new PersonConfiguration());
        base.OnModelCreating(modelBuilder);
    }
}

// End Simple EXample