我正在尝试创建DirectoryEntry的实例,以便我可以使用它来测试一些将传递DirectoryEntry的代码。然而,尽管尝试了很多,但我找不到实例化DE并初始化它的PropertyCollection的方法。
我有以下代码,它是从another answer on SO获取和修改的,它正在执行相同的过程但是对于SearchResult对象。似乎Add方法已被完全禁用,我无法找到一种方法来调用PropertyCollection上的构造函数来传递一些属性。
using System.Collections;
using System.DirectoryServices;
using System.Globalization;
using System.Reflection;
using System.Runtime.Serialization;
public static class DirectoryEntryFactory
{
const BindingFlags nonPublicInstance = BindingFlags.NonPublic | BindingFlags.Instance;
const BindingFlags publicInstance = BindingFlags.Public | BindingFlags.Instance;
public static DirectoryEntry Construct<T>(T anonInstance)
{
var e = GetUninitializedObject<DirectoryEntry>();
SetPropertiesField(e);
var dictionary = (IDictionary)e.Properties;
var type = typeof(T);
var propertyInfos = type.GetProperties(publicInstance);
foreach (var propertyInfo in propertyInfos)
{
var value = propertyInfo.GetValue(anonInstance, null);
var valueCollection = GetUninitializedObject<PropertyValueCollection>();
var innerList = GetInnerList(valueCollection);
innerList.Add(value);
var lowerKey = propertyInfo.Name.ToLower(CultureInfo.InvariantCulture);
// These both throw exceptions saying you can't add to a PropertyCollection
//(typeof(PropertyCollection)).InvokeMember("System.Collections.IDictionary.Add", nonPublicInstance | BindingFlags.InvokeMethod, null, dictionary, new object[] { propertyInfo.Name, value });
//dictionary.Add(lowerKey, propertyCollection);
}
return e;
}
private static ArrayList GetInnerList(object propertyCollection)
{
var propertyInfo = typeof(PropertyValueCollection).GetProperty("InnerList", nonPublicInstance);
return (ArrayList)propertyInfo.GetValue(propertyCollection, null);
}
private static void SetPropertiesField(DirectoryEntry e)
{
var propertiesField = typeof(DirectoryEntry).GetField("propertyCollection", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
propertiesField.SetValue(e, GetUninitializedObject<PropertyCollection>());
}
private static T GetUninitializedObject<T>()
{
return (T)FormatterServices.GetUninitializedObject(typeof(T));
}
}
用法旨在
DirectoryEntry e = DirectoryEntryFactory.Construct(new { attr1 = "Hello", attr2 = "World"});
我希望自己错过了一些东西,因为我很擅长在愤怒中使用反射。
答案 0 :(得分:3)
我不熟悉DirectoryEntry本身,但我非常喜欢用于测试的Adapter模式。你不得不做一件令人烦恼的事情,但代码本身很简单,类可以放在一个项目文件夹中,以隐藏它们远离你的主项目。
例如,我有一个FileInfoAdapter和DirectoryInfoAdapter来包装那些触及文件系统的类。
FileInfoAdapter:
public class FileInfoAdapter : IFileInfo
{
private readonly FileSystemInfo _fi;
public FileInfoAdapter(string fileName)
: this(new FileInfo(fileName))
{ }
public FileInfoAdapter(FileSystemInfo fi)
{
_fi = fi;
}
public string Name { get { return _fi.Name; } }
public string FullName { get { return _fi.FullName; } }
public bool Exists { get { return _fi.Exists; } }
}