Question

我想使用ADSI从C＃查询Windows本地用户帐户。由于使用了WinNt提供程序，因此不支持Directory SEarcher。我正在做以下事情：

DirectoryEntries entries = hostMachineDirectory.Children;
var users = from DirectoryEntry childEntry in hostMachineDirectory.Children
                where (childEntry.Name.StartsWith("User1"))
                select childEntry;

可以使用名称查询。无法获得childEntry.Description之类的描述。可以使用属性childEntry.Properties["Description"]来获取描述。那么可以使用“描述”等属性进行查询吗？

Answer 1

如果你想获得字符串，你应该这样做：

DirectoryEntries entries = hostMachineDirectory.Children;
var users = (from DirectoryEntry childEntry in hostMachineDirectory.Children
                where (childEntry.Name.StartsWith("User1"))
                select childEntry).SingleOrDefault<string>();

Answer 2

我对AD知之甚少，但我想，假设Properties["Description"].Value返回字符串，你可以这样试试：

var users = from DirectoryEntry childEntry in entries
            where ((string)childEntry.Properties["Description"].Value).StartsWith("User1")
            select childEntry;

好了，因为你确认我的假设是错误的，Properties["Description"].Value并不总是返回字符串，有时会返回NULL，我们需要先检查null，然后再检查.StartsWith或Contains或任何其他字符串检查操作：

var users = from DirectoryEntry childEntry in entries
            where childEntry.Properties["Description"].Value != null &&
                ((string)childEntry.Properties["Description"].Value).StartsWith("User1")
            select childEntry;

Answer 3

这是我如何让它发挥作用。

var users = from DirectoryEntry childEntry in hostMachineDirectory.Children
            where childEntry.SchemaClassName == "User"
            select childEntry;
try { 
    var UserName = users.Single(s => s.Properties["Description"].Value.ToString().StartsWith("Whatever description")).Name;
    Console.WriteLine("User: " + UserName);
}
catch (Exception e) { 
    var err = e.Message;
    Console.WriteLine("Error message: " + err);
}

如何在C＃中使用LINQ来查询Windows本地用户帐户

3 个答案: