Question

我创建了一个winform应用程序，可以使用C＃检测，设置和切换IPv4设置。当用户想要从DHCP自动获取IP时，我呼叫Automatic_IP()：

Automatic_IP：

private void Automatic_IP()
{
    ManagementClass mctemp = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection moctemp = mctemp.GetInstances();

    foreach (ManagementObject motemp in moctemp)
    {
        if (motemp["Caption"].Equals(_wifi)) //_wifi is the target chipset
        {
            motemp.InvokeMethod("EnableDHCP", null);
            break;
        }
    }

    MessageBox.Show("IP successfully set automatically.","Done!",MessageBoxButtons.OK,MessageBoxIcon.Information);

    Getip(); //Gets the current IP address, subnet, DNS etc
    Update_current_data(); //Updates the current IP address, subnets etc into a labels

}

在Getip方法中，我提取当前的IP地址，子网，网关和DNS，无论所有这些都可以由DHCP手动设置或自动分配，并使用标签更新标签中的值。 Update_current_data()方法。

Getip：

public bool Getip()
{
    ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection moc = mc.GetInstances();

    foreach (ManagementObject mo in moc)
    {
        if(!chipset_selector.Items.Contains(mo["Caption"]))
            chipset_selector.Items.Add(mo["Caption"]);

        if (mo["Caption"].Equals(_wifi))
        {
            ipadd = ((string[])mo["IPAddress"])[0];
            subnet = ((string[])mo["IPSubnet"])[0];
            gateway = ((string[])mo["DefaultIPGateway"])[0];
            dns = ((string[])mo["DNSServerSearchOrder"])[0];
            break;
        }

    }
}

但问题是我无法检测当前IP是手动设置还是自动分配，但我可以从Automatic_IP方法中选择从DHCP 自动选择。 ManagementObject.InvokeMethod("EnableDHCP", null);可以轻松地将其设置为自动获取IP地址但我无法检查应用程序首次启动时是自动还是手动设置IP。

我做了一些挖掘，发现了类似this的帖子。虽然存在一个非常相似的帖子here，但这是关于DNS而不是IP设置。

基本上我想找到选择的选项：

Answer 1

ManagementObject类有一堆properties可以使用，对于网络适配器，其中一个叫DHCPEnabled。这告诉您网络接口是否自动获取IP地址。例如：

var isDHCPEnabled = (bool)motemp.Properties["DHCPEnabled"].Value;

Answer 2

使用NetworkInformation类的替代方法：

using System.Net.NetworkInformation;

NetworkInterface[] Interfaces = NetworkInterface.GetAllNetworkInterfaces();
IPInterfaceProperties IPProperties = Interfaces[0].GetIPProperties();
IPv4InterfaceProperties IpV4Properties = IPProperties.GetIPv4Properties();
bool DhcpEnabed = IpV4Properties.IsDhcpEnabled;

启用DHCP的所有网络接口及其IP地址：

List<NetworkInterface> DhcpInterfaces = Interfaces
    .Where(IF => (IF.Supports(NetworkInterfaceComponent.IPv4)) &&
          (IF.GetIPProperties().GetIPv4Properties().IsDhcpEnabled))
    .ToList();

if (DhcpInterfaces != null)
{
    IEnumerable<UnicastIPAddressInformation> IpAddresses = 
        DhcpInterfaces.Select(IF => IF.GetIPProperties().UnicastAddresses.Last());
}

一个示例类，用于收集和检查NetworkInformation类可以提供的一些（有限数量）信息：

using System.Net.NetworkInformation;

public class NetWorkInterfacesInfo
{
    public string Name { get; set; }
    public string Description { get; set; }
    public PhysicalAddress MAC { get; set; }
    public List<IPAddress> IPAddresses { get; set; }
    public List<IPAddress> DnsServers { get; set; }
    public List<IPAddress> Gateways { get; set; }
    public bool DHCPEnabled { get; set; }
    public OperationalStatus Status { get; set; }
    public NetworkInterfaceType InterfaceType { get; set; }
    public Int64 Speed { get; set; }
    public Int64 BytesSent { get; set; }
    public Int64 BytesReceived { get; set; }
}

List<NetWorkInterfacesInfo> NetInterfacesInfo = new List<NetWorkInterfacesInfo>();

NetInterfacesInfo = DhcpInterfaces.Select(IF => new NetWorkInterfacesInfo()
{
    Name = IF.Name,
    Description = IF.Description,
    Status = IF.OperationalStatus,
    Speed = IF.Speed,
    InterfaceType = IF.NetworkInterfaceType,
    MAC = IF.GetPhysicalAddress(),
    DnsServers = IF.GetIPProperties().DnsAddresses.Select(ipa => ipa).ToList(),
    IPAddresses = IF.GetIPProperties().UnicastAddresses.Select(ipa => ipa.Address).ToList(),
    Gateways = IF.GetIPProperties().GatewayAddresses.Select(ipa => ipa.Address).ToList(),
    DHCPEnabled = IF.GetIPProperties().GetIPv4Properties().IsDhcpEnabled,
    BytesSent = IF.GetIPStatistics().BytesSent,
    BytesReceived = IF.GetIPStatistics().BytesReceived
}).ToList();

统计特征：

IPGlobalStatistic
TcpConnectionInformation
IPInterfaceStatistics

活动：

NetworkChange
→NetworkAddressChanged
→NetworkAvailabilityChanged

公用设施：
Ping

检测是否在Windows设置中选择“自动获取IP地址”

2 个答案: