类调用时对象未设置为实例错误

Question

我设置了三个模型。我不确定我是否以最好的方式做到了，但这是我可以轻松理解的方式。我调用DepartmentProfile 类。找到的第一个用户不是经理，因此它进入 else 语句并成功填写 AD_UserProfile 并将其添加到 DepartmentProfile 类中。

第二个用户是部门经理，所以它进入 if 语句并在第一行出错，对象未设置为对象实例。我错过了什么？我没有正确设置模型吗？

当它出错时

public class AD_UserProfile
    {
        public string distinguishedName { get; set; }
        public string email { get; set; }
        public string manager { get; set; }
        public string name { get; set; }
        public string userPrincipalName { get; set; } // Useful if we need to allow a user to 'log on' as a different user.  
        public string userName { get; set; } 
    }

public class AD_ManagerProfile
    {
        public string distinguishedName { get; set; }
        public string email { get; set; }
        public string manager { get; set; }
        public string name { get; set; }
        public string userPrincipalName { get; set; } // Useful if we need to allow a user to 'log on' as a different user.  
        public string userName { get; set; }
    }

public class AD_DepartmentProfile
    {
        public AD_DepartmentProfile()
        {
            this.AD_UserProfile = new HashSet<AD_UserProfile>();
        }

        public string name { get; set; }

        public virtual AD_ManagerProfile AD_ManagerProfile { get; set; }
        public virtual ICollection<AD_UserProfile> AD_UserProfile { get; set; }
    }

这是类的调用：

public void GetDepartmentInfo(string department, string owner = "jeremy")
        {
            DirectoryEntry de = new DirectoryEntry("LDAP://server.server.com");

            DirectorySearcher ds = new DirectorySearcher(de);

            ds.Filter = ("(&(objectCategory=person)(objectClass=User)(department=" + department + "))");
            ds.SearchScope = SearchScope.Subtree;

            AD_DepartmentProfile dp = new AD_DepartmentProfile();

            dp.name = department; // assign department name

            foreach (SearchResult temp in ds.FindAll())
            {
                if (owner == temp.Properties["sAMAccountName"][0].ToString())
                {
                    //Current user is manager of department

                    dp.AD_ManagerProfile.distinguishedName = temp.Properties["distinguishedName"][0].ToString();  // This line errors out with instance not set to object error.
                    dp.AD_ManagerProfile.email = temp.Properties["mail"][0].ToString();
                    dp.AD_ManagerProfile.manager = temp.Properties["manager"][0].ToString();
                    dp.AD_ManagerProfile.name = temp.Properties["name"][0].ToString();
                    dp.AD_ManagerProfile.userPrincipalName = temp.Properties["userPrincipalName"][0].ToString();
                    dp.AD_ManagerProfile.userName = temp.Properties["sAMAccountName"][0].ToString();
                }
                else
                {
                    //Current user is in department and does not manage it

                    AD_UserProfile p = new AD_UserProfile();

                    p.distinguishedName = temp.Properties["distinguishedName"][0].ToString();
                    p.email = temp.Properties["mail"][0].ToString();
                    p.manager = temp.Properties["manager"][0].ToString();
                    p.name = temp.Properties["name"][0].ToString();
                    p.userPrincipalName = temp.Properties["userPrincipalName"][0].ToString();
                    p.userName = temp.Properties["sAMAccountName"][0].ToString();

                    dp.AD_UserProfile.Add(p);
                }
            }
        }

Answer 1

我没有看到您正在初始化 dp.AD_ManagerProfile 的任何地方，所以很可能是 null。您可以在 GetDepartmentInfo 或构造函数中为其赋值。

if (owner == temp.Properties["sAMAccountName"][0].ToString())
{
    //Current user is manager of department

    dp.AD_ManagerProfile = new AD_ManagerProfile();

    dp.AD_ManagerProfile.distinguishedName = temp.Properties["distinguishedName"][0].ToString();  // This line errors out with instance not set to object error.

或

public AD_DepartmentProfile()
{
    this.AD_UserProfile = new HashSet<AD_UserProfile>();
    this.AD_ManagerProfile = new AD_ManagerProfile();
}