有两种方法可以通过 .NET 检索 uSNChanged 属性:

There are two ways to retrieve the uSNChanged property via .NET:

1. 包含对 COM 库的引用:Active DS 类型库"，然后您需要使用 IADsLargeInterger 检索该值，最后将其转换为 long代码>.例如:

1. Include a reference to a COM library: "Active DS Type Library", then you need to use the IADsLargeInterger to retrieve the value and finally convert it to a long. For example:

IADsLargeInteger li_ad = (IADsLargeInteger)oUser.Properties["USNChanged"].Value;
long l_uChanged = GetLongFromLargeInteger( li_ad );

static long GetLongFromLargeInteger(  IADsLargeInteger  Li )
{
    long retval = Li.HighPart;
    retval <<=32;
    retval |=(uint)Li.LowPart;
    return retval;
}

 long usnChanged = ConvertADSLargeIntegerToInt64(oUser.Properties["USNChanged"].Value);

 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;
 }

我强烈建议您使用选项 #2 以避免旧 ActiveDs 库出现问题，并且不需要 此列表.

I highly recommend you go with Option #2 to avoid problems with the legacy ActiveDs library and won't need answers off this list.