迭代嵌套集合并使用 Parent 形成组织结构

Question

我有一批使用该模型定义的用户。

我需要在 Manager 不为空时迭代 Manager 嵌套并创建具有父关系的 Departments 实体。我有一个我已经拥有的代码示例，所以我将其发布在这里。

我已经拥有的：

   public class AdUserModel  
        {
            public string UserName { get; set; }
            
            public AdUserModel Manager { get; set; }
    
        }

...

            List<UserDepartment> userDepartmentsToAdd = new List<UserDepartment>();
            List<Department> newDeps = new List<Department>();

            RecurseDepartments(adUser);

            var userDepartment = new UserDepartment
                    {
                        User = user,
                        PositionName = adUser.PositionName,
                        Department = newDeps.FirstOrDefault(x => x.Name == adUser.DepartmentName),
                        IsHeadUser = user.SubordinateUsers?.Any() ?? false
                    };

                    userDepartmentsToAdd.Add(userDepartment);

             void RecurseDepartments(AdUserModel model)
                    {
                  
                   var department = new Department();
                   var existDep = newDeps.FirstOrDefault(x => x.Name == 
                                                model.DepartmentName);

                if (existDep == null)
                {
                    department.Name = model.DepartmentName;
                }
                
                    if (model.Manager is not null)
                    {
                        if (newDeps.FirstOrDefault(x => x.Name == model.Manager.DepartmentName) == null)
                        {
                            var parentDepartment = new Department
                            {
                                Name = model.Manager.DepartmentName
                            };
                            department.ParentDepartment = existDep ?? department;
                            if (existDep == null)
                            {
                                newDeps.Add(department);
                            }
                            newDeps.Add(parentDepartment);
                        }
                        
                        if (model.Manager.DepartmentName != model.DepartmentName)
                        {
                            RecurseDepartments(model.Manager);
                        }
                    }

            }

感谢您提前提供的任何帮助，由于某种原因被困在这里。