如何阅读“uSNChanged"使用 C# 的属性-C#/.NET问题

How to read quot;uSNChangedquot; property using C#(如何阅读“uSNChanged使用 C# 的属性)

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问题描述

我想使用 C# 通过 ActiveDirectory 中的 uSNChanged 值获取最后修改或创建的属性......我还试图找到 uSNChanged 的最大值，你能帮我找出解决办法吗?谢谢

I want to get the last modified or created attributes via the uSNChanged value in ActiveDirectory using C# ... I was also trying to find the max value of uSNChanged, can you help me to find out the solution? Thanks

推荐答案

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:

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.例如:



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;
}

仅使用 C# 翻译值.感谢 Simon Gilbee，我们有这个选项:
 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.

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