/// <summary>
/// Typical usage:
/// foreach (string s in RangeHelper.StringValues(conn, "cn=test", "member", 0, null, false))
/// ....
///
/// </summary>
/// <param name="conn"></param>
/// <param name="entryDn"></param>
/// <param name="attrName"></param>
/// <param name="start"></param>
/// <param name="end"></param>
/// <returns></returns>
public static IEnumerable <string> StringValues(LdapConnection conn, string entryDn, string attrName, int start, int?end, bool extendedDns)
{
int requested = 0, returned = 0;
if (end != null)
{
requested = end.Value - start;
}
RangeResult r = GetRangeBlock(conn, entryDn, attrName, start, end, extendedDns);
while (r != null)
{
foreach (string s in r.Values)
{
if (requested > 0 && ++returned >= requested)
{
yield break;
}
yield return(s);
}
if (r.IsFinal)
{
yield break;
}
else
{
r = GetRangeBlock(conn, entryDn, attrName, r.End + 1, end, extendedDns);
}
}
yield break;
}
private static RangeResult GetRangeBlock(LdapConnection conn, string entryDn, string attrName, int start, int?end, bool extendedDns)
{
SearchRequest req = new SearchRequest();
req.DistinguishedName = entryDn;
req.Scope = SearchScope.Base;
req.Filter = "(&(objectClass=*))";
req.Attributes.Add(attrName + ";range=" + start + "-" + (end == null ? "*" : end.ToString()));
if (extendedDns)
{
req.Controls.Add(new ExtendedDNControl(ExtendedDNFlag.StandardString));
}
SearchResponse resp = (SearchResponse)conn.SendRequest(req);
if (resp.Entries.Count == 0)
{
return(null);
}
SearchResultEntry e = resp.Entries[0];
foreach (string s in e.Attributes.AttributeNames)
{
if (s.StartsWith(attrName, StringComparison.InvariantCultureIgnoreCase))
{
RangeResult res = new RangeResult();
DirectoryAttribute attr = e.Attributes[s];
res.Values = (string[])attr.GetValues(typeof(string));
if (s.EndsWith("*"))
{
res.IsFinal = true;
}
int pos = s.IndexOf('=');
int hyp = s.IndexOf('-', pos + 1);
res.Start = int.Parse(s.Substring(pos + 1, hyp - pos - 1));
if (!res.IsFinal)
{
res.End = int.Parse(s.Substring(hyp + 1));
}
return(res);
}
}
return(null);
}