将lastlogontimestamp转换为DateTime

Question

我正在尝试将lastlogontimestamp转换为datetime，但我注意到大值，我得到错误异常消息：索引超出范围。必须是非负数且小于集合的大小。

有没有更好的方法来做到这一点？

var de = new DirectoryEntry("LDAP://GLOBAL.ABC.COM");
var ds = new DirectorySearcher(de);
ds.Filter = string.Format("(&(objectCategory=user)(objectClass=user)({0}={1}))", 
  "samAccountName", username);
ds.PropertiesToLoad.AddRange(new string[] { "samAccountName", "lastLogon" });
SearchResult sr = ds.FindOne();
long lastLogon = (long)sr.Properties["lastLogon"][0];
// lastLogon is 131111471723190497 
var dtLastLogon = DateTime.FromFileTime(lastLogon);
return dtLastLogon.ToString();

Answer 1

您的问题在于帐户不必具有// ... SearchResult sr = ds.FindOne(); if (sr.Properties["lastLogon"] != null && sr.Properties["lastLogon"].Count > 0) { long lastLogon = (long)sr.Properties["lastLogon"][0]; var dtLastLogon = DateTime.FromFileTime(lastLogon); return dtLastLogon.ToString(); } // last logon is not set here - make something up; for example return DateTime.MinValue.ToString() 属性。所以代码应该看起来像

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