我如何在Windows 10计算机上以C#获取DNS后缀搜索列表?
例如,如果我在cmd中键入ipconfig
,则会看到类似以下内容:
Windows IP Configuration
Host Name . . . . . . . . . . . . : BOB
Primary Dns Suffix . . . . . . . : fred.george.com
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : fred.com
george.com
我想获得一个数组“fred.com”和“george.com”。我尝试了几种不同的方法[1],但是它们使用了adapters属性(为空白)。
[1] https://docs.microsoft.com/en-us/dotnet/api/system.net.networkinformation.ipinterfaceproperties.dnssuffix?view=netframework-4.8
最佳答案
域后缀存储在注册表中:
System\CurrentControlSet\Services\Tcpip\Parameters
SearchList (REG_SZ)
该设置是机器的全局设置(所有适配器和所有ip地址(IPv4和IPv6))使用以下代码获取字符串:
string searchList = "";
try
{
using (var reg = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(tcpSettingsSubKey))
{
searchList = (reg.GetValue("SearchList") as string);
}
}
catch(Exception ex)
{
// something went wrong
}
我编写了此类,以获得更多这些设置。在此类中,后缀存储在DNSSearchListString
和DNSSearchList
中。using System;
using System.Linq;
/// <summary>
/// Retrieving some IP settings from the registry.
/// The default dns suffix is not stored there but cat be read from:
/// <see cref="System.Net.NetworkInformation.IPInterfaceProperties.DnsSuffix"/>
/// </summary>
public static class LocalMachineIpSettings
{
private readonly static object dataReadLock = new object();
private static bool dataReadFinished = false;
private static string domain;
private static string hostname;
private static int? iPEnableRouter;
/// <summary>
/// Search list (the suffixes) as stored in registry
/// </summary>
private static string searchListString;
/// <summary>
/// Search list (the suffixes) as string array
/// </summary>
private static string[] searchList;
/// <summary>
/// also available at: <see cref="System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties()"/>
/// </summary>
public static string Domain { get { ReadValues(); return domain; } }
/// <summary>
/// also available at: <see cref="System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties()"/>
/// </summary>
public static string Hostname { get { ReadValues(); return hostname; } }
public static int? IPEnableRouter { get { ReadValues(); return iPEnableRouter; } }
public static string[] DNSSearchList { get { ReadValues(); return searchList; } }
public static string DNSSearchListString { get { ReadValues(); return searchListString; } }
private static void ReadValues()
{
lock (dataReadLock)
{
if (dataReadFinished == true)
{
return;
//<----------
}
ForceRefresh();
}
}
/// <summary>
/// Reread the values
/// </summary>
public static void ForceRefresh()
{
const string tcpSettingsSubKey = @"System\CurrentControlSet\Services\Tcpip\Parameters";
lock (dataReadLock)
{
try
{
Microsoft.Win32.RegistryKey reg = null;
using (reg = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(tcpSettingsSubKey))
{
domain = (reg.GetValue("Domain") as string);
hostname = (reg.GetValue("Hostname") as string);
iPEnableRouter = (reg.GetValue("IPEnableRouter") as int?);
searchListString = (reg.GetValue("SearchList") as string);
searchList = searchListString?.Split(new[] { ' ', ',', ';' }, StringSplitOptions.RemoveEmptyEntries).Select(o => o.Trim(' ', '.')).ToArray();
}
dataReadFinished = true;
}
catch (Exception ex)
{
throw new InvalidOperationException($"Cannot access HKLM\\{ tcpSettingsSubKey } or values beneath see inner exception for details", ex);
//<----------
}
}
}
}
关于c# - 如何在C#中以编程方式获取DNS后缀搜索列表,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/58304199/