从理论上讲，您可以创建一个方法，该方法根据指定的深度级别动态构建查询表达式：
context.FamilyLabels.Where(x => x.Parent. ... .Parent != null && x.Parent.Parent ... .Parent == null);
以下实现可以达到目的：
public static IList<FamilyLabel> Get(DbConnection connection, int depth){ var p = expression.Parameter(typeof(FamilyLabel)); expression current = p; for (int i = 0; i < deep; i++) { current = expression.Property(current, "Parent"); } var nullConst = expression.Constant(null, typeof(FamilyLabel)); var predicate = expression.Lambda<Func<FamilyLabel, bool>>( expression.AndAlso( expression.NotEqual(current, nullConst), expression.Equal(expression.Property(current, "Parent"), nullConst)), p); using (MyDbContext context = new MyDbContext(connection)) { return context.FamilyLabels.Where(predicate).ToList(); }}但是，大概这会创建一堆联接表达式，因此这可能不是最佳方法。
