c# – 扩展UserPrincipal类

我做了UserPrincipal类的扩展,以检索我需要的一些缺少的属性：

[DirectoryObjectClass("user")]
[DirectoryRdnPrefix("CN")]
class UserPrincipalExt : UserPrincipal
{
    public UserPrincipalExt(PrincipalContext context)
        : base(context)
    {
    }

    [DirectoryProperty("department")]
    public string Department
    {
        get
        {
            if (ExtensionGet("department").Length != 1)
                return null;
            return (string)ExtensionGet("department")[0];
        }
        set 
        { 
            this.ExtensionSet("department",value); 
        }
    }

    [DirectoryProperty("company")]
    public string Company
    {
        get
        {
            if (ExtensionGet("company").Length != 1)
                return null;
            return (string)ExtensionGet("company")[0];
        }
        set
        {
            this.ExtensionSet("company",value);
        }
    }

    [DirectoryProperty("c")]
    public string CountryAbbreviation
    {
        get
        {
            if (ExtensionGet("c").Length != 1)
                return null;
            return (string)ExtensionGet("c")[0];
        }
        set
        {
            this.ExtensionSet("c",value);
        }
    }
}

然后,我可以像这样轻松搜索：

PrincipalContext principalContext = new PrincipalContext(ContextType.Domain,myDomain);
 UserPrincipalExt userExt = new UserPrincipalExt(principalContext);
 PrincipalSearcher searcher = new PrincipalSearcher(userExt);

 userExt.Givenname = "blabla";
 userExt.EmailAddress ="text here";

 PrincipalSearchResult<Principal> searchTmp = null;

 searcher.QueryFilter = userExt;
 searchTmp = searcher.FindAll();

因此,我的新任务和我当前的问题是：对于ActiveDirectory中搜索到的组,当然需要使用扩展类来获取用户列表.

GroupPrincipal group = (GroupPrincipal)collection.FirstOrDefault();

foreach (Principal pRes in group.GetMembers())
{
   //This doesnt work of course.
   // return null value.
   UserPrincipalExt user = pRes as UserPrincipalExt;
}

我怎样才能实现目标？

作为解决方法,我已经创建了一个函数来检索属性：

private string GetExtendedProperty(Principal principal,string propertyTo)
    {
        string property = "";

        try
        {
            DirectoryEntry directoryEntry = principal.GetUnderlyingObject() as DirectoryEntry;

            if (directoryEntry.Properties.Contains(propertyTo))
            {
                property = directoryEntry.Properties[propertyTo].Value.ToString();
            }
            else
            {
                property = "";
            }
        }
        catch (Exception ex)
        {
            Logger.ScriviLog(4,this.GetType().Name,MethodBase.GetCurrentMethod().Name,ex.Message);
        }

        return property;
    }

先感谢您.

解决方法

覆盖扩展类中的FindByIdentity方法.

public new static User FindByIdentity(PrincipalContext context,string identityValue)
{
    return (User)FindByIdentityWithType(context,typeof(User),identityValue);
}

public new static User FindByIdentity(PrincipalContext context,IdentityType identityType,identityType,identityValue);
}

然后使用扩展类FindByIdentity方法进行搜索

var user = User.FindByIdentity(
    DomainContext,"name"
);

见这Link