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POHow to change System.DirectoryEntry "uSNChanged" attribute value to an Int64
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  1. POHow to change System.DirectoryEntry "uSNChanged" attribute value to an Int64
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    copied!<p>I'm trying to get the Int64 value of a Directory Services object's "uSNChanged" value. Unfortunately, it is always coming back as a COM object of some kind. I've tried using casting to Int64, calling Int64.Parse(), and calling Convert.ToInt64(). None of these work.</p> <p>For a given DirectoryEntry object, this code will display the properties:</p> <pre><code> private static void DisplaySelectedProperties(DirectoryEntry objADObject) { try { string[] properties = new string[] { "displayName", "whenCreated", "whenChanged", "uSNCreated", "uSNChanged", }; Console.WriteLine(String.Format("Displaying selected properties of {0}", objADObject.Path)); foreach (string strAttrName in properties) { foreach (var objAttrValue in objADObject.Properties[strAttrName]) { string strAttrValue = objAttrValue.ToString(); Console.WriteLine(String.Format(" {0, -22} : {1}", strAttrName, strAttrValue)); } } Console.WriteLine(); } catch (Exception ex) { throw new ApplicationException(string.Format("Fatal error accessing: {0} - {1}", objADObject.Path, ex.Message), ex); } } </code></pre> <p>This is the output:</p> <pre> Displaying selected properties of LDAP://server/o=org/cn=obj displayName : Display Name whenCreated : 7/8/2009 7:29:02 PM whenChanged : 7/8/2009 10:42:23 PM uSNCreated : System.__ComObject uSNChanged : System.__ComObject </pre> <p>How do I convert that System.__ComObject into a Int64?</p> <hr/> <h2>Solution Used:</h2> <p>This is the solution I used based on marc_s's solution below:</p> <pre><code> public static Int64 ConvertADSLargeIntegerToInt64(object adsLargeInteger) { var highPart = (Int32)adsLargeInteger.GetType().InvokeMember("HighPart", System.Reflection.BindingFlags.GetProperty, null, adsLargeInteger, null); var lowPart = (Int32)adsLargeInteger.GetType().InvokeMember("LowPart", System.Reflection.BindingFlags.GetProperty, null, adsLargeInteger, null); return highPart * ((Int64)UInt32.MaxValue + 1) + lowPart; } </code></pre>
 

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