如何在Asp .Net中从Active Directory中获取不同的部门名称？

Question

我想从AD中获得唯一或不同的部门名称，那么正确的查询是什么？下面是我的代码：

private static DomainController GetDomainController(string domainpath)
{
    var domainContext = new DirectoryContext(DirectoryContextType.Domain, domainpath);
    var domain = Domain.GetDomain(domainContext);
    var controller = domain.FindDomainController();
    return controller;
}

private static MyMethod()
{
    var domainController = GetDomainController(ActiveDirectorySettings.DomainPath);

    // Lookup the information in AD
    var ldapEntry = new DirectoryEntry(string.Format("LDAP://{0}", domainController)) { AuthenticationType = AuthenticationTypes.Secure | AuthenticationTypes.FastBind };
    DirectorySearcher ds;

    ds = new DirectorySearcher(ldapEntry)
    {
        SearchScope = SearchScope.Subtree,
        Filter = "(&" + "(objectClass=user)" + "(department=" + departmentname + "*))"
    };

    ds.PropertiesToLoad.Add("department");
    if (ds.FindAll().Count >= 1)
    {
        //do something....
    }
}

在这里，我得到了所有部门的名称，包括重复项。但我想要的是-

如果3个用户属于同一个部门(X)，那么我想要部门(X)一次，而不是三次。

Answer 1

您可以使用LINQ来获得唯一/不同的搜索结果。以下是代码片段：

if (ds.FindAll().Count >= 1)
{
    var overallSearchResult = ds.FindAll();
    //to apply distinct on path property of elements in the collection
    var uniqueSearchResultsForPath =  overallSearchResult.Cast<System.DirectoryServices.SearchResult>().Select(x => x.Path).Distinct();

    //To apply distinct on any specific property in the "Properties" property of the elements in the collection
    //this will give you list of distinct departments for example

    var uniqueSearchResultsForDepartment = overallSearchResult.Cast<System.DirectoryServices.SearchResult>().Select(x => x.Properties["department"][0]).Distinct();
}

您必须在编写此代码的C#文件中包含using System.Linq;名称空间。