如何用C#设置本机固定IP地址

可以通过以下代码在C#中设置本机的固定IP地址：

using System;
using System.Management;

public static void SetStaticIP(string ipAddress, string subnetMask, string gateway, string dns)
{
    ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection moc = mc.GetInstances();

    foreach (ManagementObject mo in moc)
    {
        if ((bool)mo["IPEnabled"])
        {
            ManagementBaseObject newIP = mo.GetMethodParameters("EnableStatic");
            newIP["IPAddress"] = new string[] { ipAddress };
            newIP["SubnetMask"] = new string[] { subnetMask };
            ManagementBaseObject setIP = null;
            setIP = mo.InvokeMethod("EnableStatic", newIP, null);

            ManagementBaseObject newGate = mo.GetMethodParameters("SetGateways");
            newGate["DefaultIPGateway"] = new string[] { gateway };
            ManagementBaseObject setGate = null;
            setGate = mo.InvokeMethod("SetGateways", newGate, null);

            ManagementBaseObject newDNS = mo.GetMethodParameters("SetDNSServerSearchOrder");
            newDNS["DNSServerSearchOrder"] = new string[] { dns };
            ManagementBaseObject setDNS = null;
            setDNS = mo.InvokeMethod("SetDNSServerSearchOrder", newDNS, null);
        }
    }
}

其中，`ipAddress`为要设置的IP地址，`subnetMask`为子网掩码，`gateway`为网关地址，`dns`为DNS服务器地址。在调用该方法后，本机的IP地址将会被设置为指定的固定IP地址。