如何列出所有计算机以及他们最后一次登录AD？

我正在尝试检索计算机名称列表以及它们上次从Active Directory登录的日期,并将它们返回到数据表中.获取名称很容易但是当我尝试添加"lastLogon"或"lastLogonTimestamp"时,如下所示,我获得的lastLogonTimestamp的唯一值是"System._ComObject"

public DataTable GetListOfComputers(string domainName)
{
  DirectoryEntry entry = new DirectoryEntry("LDAP://DC=" + domainName + ",DC=com");
  DirectorySearcher search = new DirectorySearcher(entry);
  string query = "(objectclass=computer)";
  search.Filter = query;

  search.PropertiesToLoad.Add("name");
  search.PropertiesToLoad.Add("lastLogonTimestamp");

  SearchResultCollection mySearchResultColl = search.FindAll();

  DataTable results = new DataTable();
  results.Columns.Add("name");
  results.Columns.Add("lastLogonTimestamp");

  foreach (SearchResult sr in mySearchResultColl)
  {
    DataRow dr = results.NewRow();
    DirectoryEntry de = sr.GetDirectoryEntry();
    dr["name"] = de.Properties["Name"].Value;
    dr["lastLogonTimestamp"] = de.Properties["lastLogonTimestamp"].Value;
    results.Rows.Add(dr);
    de.Close();
  }

  return results;
}

如果我使用像LDP这样的工具查询AD,我可以看到该属性存在并填充了数据.我怎样才能获得这些信息？

使用ComputerPrincipal类和System.DirectoryServices.AccountManagement中的PrincipalSearcher会更容易.

PrincipalContext pc = new PrincipalContext(ContextType.Domain, domainName);
PrincipalSearcher ps = new PrincipalSearcher(new ComputerPrincipal(pc));
PrincipalSearchResult psr = ps.FindAll();
foreach (ComputerPrincipal cp in psr)
{
    DataRow dr = results.NewRow();
    dr["name"] = cp.Name;
    dr["lastLogonTimestamp"] = cp.LastLogon;    
    results.Rows.Add(dr);
}

**处理从DirectoryEntry检索到的属性'lastLogonTimestamp'的方法是将其转换为IADSLargeInteger

来自:http: //www.dotnet247.com/247reference/msgs/31/159934.aspx**

为这些类型返回的__ComObject是数值的IADsLargeInteger和SecurityDescriptors的IADsSecurityDescriptor.

您可以在COM选项卡上包含对Active DS Type Lib的引用,并获取这些接口的定义或手动定义它们.这是一个示例:

using System;
using System.DirectoryServices;
using System.Runtime.InteropServices;

//This is the managed definition of this interface also found in
ActiveDs.tlb
[ComImport]
[Guid("9068270B-0939-11D1-8BE1-00C04FD8D503")]
[InterfaceType(ComInterfaceType.InterfaceIsDual)]
internal interface IADsLargeInteger
{
    [DispId(0x00000002)]
    int HighPart{get; set;}
    [DispId(0x00000003)]
    int LowPart{get; set;}
}

class Class1
{
    [STAThread]
    static void Main(string[] args)
    {
        DirectoryEntry entry = new
DirectoryEntry("LDAP://cn=user,cn=users,dc=domain,dc=com");
        if(entry.Properties.Contains("lastLogon"))
        {
            IADsLargeInteger li =
(IADsLargeInteger)entry.Properties["lastLogon"][0];    
            long date = (long)li.HighPart << 32 | (uint)li.LowPart;
            DateTime time = DateTime.FromFileTime(date);
            Console.WriteLine("Last logged on at: {0}", time);
        }
    }

}

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