问题描述
我正在尝试从帐户中检索到期日期.
I'm trying to retrieve the expiration date from accounts.
我试过了
DirectoryEntry user = new DirectoryEntry(iMem); var AccountExpiration = DateTime.FromFileTime((int)user.Properties["accountExpires"].Value);
它不起作用,只会给我错误指定的演员表无效".
it doesn't work, only gives me the error "Specified cast is not valid".
当我使用
var AccountExpiration = user.Properties["accountExpires"];
返回一个我无法读取的 com 对象.
returns a com object, which I'm unable to read.
使用 windows powershell,工作正常,我不明白为什么这行不通...
Using windows powershell, works fine, I don't get why this wont work...
这是我在powershell中使用的代码
this is the code I use in powershell
$Expires = [datetime]::FromFileTime($tmpUser.accountExpires)
推荐答案
您可以使用 System.DirectoryServices.AccountManagement 命名空间来完成此任务.从 PrincipalContext 获得 UserPrincipal 后,您可以检查 UserPrincipal.AccountExpirationDate 属性.
You can use the System.DirectoryServices.AccountManagement namespace to accomplish this task. Once you get a UserPrincipal from a PrincipalContext, you can inspect the UserPrincipal.AccountExpirationDate property.
PrincipalContext context = new PrincipalContext(ContextType.Domain); UserPrincipal p = UserPrincipal.FindByIdentity(context, "Domain\User Name"); if (p.AccountExpirationDate.HasValue) { DateTime expiration = p.AccountExpirationDate.Value.ToLocalTime(); }
如果您确实想要使用DirectoryEntry,请执行以下操作:
If you do want to use DirectoryEntry, do this:
//assume 'user' is DirectoryEntry representing user to check DateTime expires = DateTime.FromFileTime(GetInt64(user, "accountExpires")); private Int64 GetInt64(DirectoryEntry entry, string attr) { //we will use the marshaling behavior of the searcher DirectorySearcher ds = new DirectorySearcher( entry, String.Format("({0}=*)", attr), new string[] { attr }, SearchScope.Base ); SearchResult sr = ds.FindOne(); if (sr != null) { if (sr.Properties.Contains(attr)) { return (Int64)sr.Properties[attr][0]; } } return -1; }
另一种解析 accountExpires 值的方法是使用反射:
Another way of parsing the accountExpires value is using reflection:
private static long ConvertLargeIntegerToLong(object largeInteger) { Type type = largeInteger.GetType(); int highPart = (int)type.InvokeMember("HighPart", BindingFlags.GetProperty, null, largeInteger, null); int lowPart = (int)type.InvokeMember("LowPart", BindingFlags.GetProperty | BindingFlags.Public, null, largeInteger, null); return (long)highPart <<32 | (uint)lowPart; } object accountExpires = DirectoryEntryHelper.GetAdObjectProperty(directoryEntry, "accountExpires"); var asLong = ConvertLargeIntegerToLong(accountExpires); if (asLong == long.MaxValue || asLong <= 0 || DateTime.MaxValue.ToFileTime() <= asLong) { return DateTime.MaxValue; } else { return DateTime.FromFileTimeUtc(asLong); }