因此我想出了很多错误，但这是对我有用的解决方案。您无需实例化单个导航属性。这将使其始终为空。如果它是对象的ICollection，则仍然需要实例化Navigation属性。还有其他一些小事情。谢谢您的帮助。
public partial class Submission{public int Keytbl { get; set; } public int Company { get; set; } public virtual tbl_lst_Company tbl_lst_Company{ get; set; } }public partial class tbl_lst_Company{ public tbl_lst_Company() { this.Submissions = new List<Submission>();} public int CompanyID { get; set; } public string Company { get; set; } public virtual ICollection<Submission> Submissions { get; set; }}public tbl_lst_CompanyMap(){ // Primary Key this.HasKey(t => t.CompanyID); // Properties this.Property(t => t.Company) .IsRequired() .HasMaxLength(150); // Table & Column Mappings this.ToTable("tbl_lst_Company"); this.Property(t => t.CompanyID).HasColumnName("CompanyID"); this.Property(t => t.Company).HasColumnName("Company");}public SubmissionMap(){ // Primary Key this.HasKey(t => t.Keytbl); // Table & Column Mappings this.ToTable("Submissions"); this.Property(t => t.Keytbl).HasColumnName("Keytbl"); this.Property(t => t.Company).HasColumnName("Company"); this.HasOptional(t => t.tbl_lst_Company) .WithMany(t => t.Submissions).HasForeignKey(d => d.Company);}[TestMethod]public void test_lazy_loading() { using (var db = new SubmissionContext()) { var subs = (from s in b.Submissions select s); var x = subs.First().tbl_lst_Company; Assert.AreEqual(x, null, "Lazy Loading Failed"); }}
