如何改变System.DirectoryEntry＆QUOT; uSNChanged＆QUOT;属性值为Int64 [英] How to change System.DirectoryEntry "uSNChanged" attribute value to an Int64

问题描述

我试图让一个目录服务对象的uSNChanged值的Int64值。不幸的是，它总是回来为某种一个COM对象。我用铸造的Int64试过了，叫Int64.Parse（），并调用Convert.ToInt64（）。所有这些工作。

对于一个给定的DirectoryEntry对象，code将显示属性：

 私有静态无效DisplaySelectedProperties（的DirectoryEntry objADObject）
{
		尝试
{
字符串[]属性=新的String [] {
				显示名称，
whenCreated
whenChanged
uSNCreated
uSNChanged
};

Console.WriteLine（的String.Format（显示{0}中选择属性，objADObject.Path））;
的foreach（在属性字符串strAttrName）
{
的foreach（在objADObject.Properties VAR objAttrValue [strAttrName]）
{
字符串strAttrValue = objAttrValue.ToString（）;
Console.WriteLine（的String.Format（{0，-22}：{1}，strAttrName，strAttrValue））;
}
}
Console.WriteLine（）;
}
赶上（例外前）
{
抛出新ApplicationException的（的String.Format（致命错误访问：{0}  -  {1}，objADObject.Path，ex.Message），前）;
}
}
 

这是输出：

显示LDAP中选择属性：//服务器/ o =组织/ CN = OBJ
   显示名：显示名称
   whenCreated：7/8/2009下午7点29分02秒
   whenChanged：7/8/2009下午10时42分二十三秒
   uSNCreated：系统.__ ComObject
   uSNChanged：系统.__ ComObject

我如何将其转换系统.__ ComObject成的Int64？

---

解决方案中使用：

这是我使用了基于marc_s的解决方案如下解决方案：

 公共静态的Int64 ConvertADSLargeIntegerToInt64（对象adsLargeInteger）
{
。VAR highPart =（Int32）已adsLargeInteger.GetType（）InvokeMember（HighPart，System.Reflection.BindingFlags.GetProperty，空，adsLargeInteger，NULL）;
。VAR lowPart =（Int32）已adsLargeInteger.GetType（）InvokeMember（LowPart，System.Reflection.BindingFlags.GetProperty，空，adsLargeInteger，NULL）;
返回highPart *（（的Int64）UInt32.MaxValue + 1）+ lowPart;
}
 

解决方案

我用这个片段的code在我ADSI浏览器的的海狸 的是C＃编写的：

 的Int64 iLargeInt = 0;

IADsLargeInteger int64Val =（IADsLargeInteger）oPropValue.LargeInteger;
iLargeInt = int64Val.HighPart * 4294967296 + int64Val.LowPart;
 

据我所知，这应该只是罚款。

马克·

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.

For a given DirectoryEntry object, this code will display the properties:

	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);
		}
	}

This is the output:

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

How do I convert that System.__ComObject into a Int64?

---

Solution Used:

This is the solution I used based on marc_s's solution below:

	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;
	}

解决方案

I'm using this snippet of code in my ADSI Browser BeaverTail which is written in C#:

Int64 iLargeInt = 0;

IADsLargeInteger int64Val = (IADsLargeInteger)oPropValue.LargeInteger;
iLargeInt = int64Val.HighPart * 4294967296 + int64Val.LowPart;

As far as I can tell, this should work just fine.

Marc

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