c# - 在事件目录底层对象上使用 linq

Question

目前我的代码是:

using (var context = new PrincipalContext(ContextType.Domain, adDomain))
{
    using (var searcher = new PrincipalSearcher(new UserPrincipal(context)))
    {
        foreach (Principal result in searcher.FindAll())
        {
            DirectoryEntry entry = result.GetUnderlyingObject() as DirectoryEntry;
            if (entry.Properties["Company"].Value?.ToString() == "My Company")
            {
                // do some stuff
            }
        }
    }
}

我只是想知道是否可以执行 LINQ 语句而不是 if 语句来只获取我感兴趣的条目。

像这样:

foreach (var entry in searcher.FindAll()
    .Where(x => x.GetUnderlyingObject<DirectoryEntries>()
    .Properties["Company"].Value?.ToString() == "MY Company"))
{
    // do some stuff
}

Answer 1

应该是可以的。您可以先使用 Select() 将对象转换为 DirectoryEntry。这样的事情应该有效:

var entry = searcher.FindAll()
    .Select(x => (DirectoryEntry)x.GetUnderlyingObject())
    .Where(x => x.Properties["Company"].Value?.ToString() == "My Company")
    .FirstOrDefault();  // or .ToList() depending on your requirements

if (entry != null)
{
    // do some stuff
}