将DNS设置为以编程方式"自动获取"

Question

在.NET上使用C#,如何将DNS服务器设置为"自动获取"？我可以将IP地址设置为所需的值.

ManagementClass mClass = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection mObjCol = mClass.GetInstances();
foreach (ManagementObject mObj in mObjCol)
{
  if ((bool)mObj["IPEnabled"])
  {
     ManagementBaseObject mboDNS = mObj.GetMethodParameters("SetDNSServerSearchOrder");
     if (mboDNS != null)
     {
        //Assume X.X.X.X and X.X.X.X are the IPs.
        string[] sIPs = { "X.X.X.X", "X.X.X.X" };
        mboDNS["DNSServerSearchOrder"] = sIPs;
        mObj.InvokeMethod("SetDNSServerSearchOrder", mboDNS, null);
     }
  }
}

我已经尝试将两个IP都设置为null,sIps = { null, null };但最终不会更改设置.

Answer 1

尝试将DNSServerSearchOrder设置为null,而不是使用空字符串数组.

ManagementClass mClass = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection mObjCol = mClass.GetInstances();
foreach (ManagementObject mObj in mObjCol)
{
  if ((bool)mObj["IPEnabled"])
  {
     ManagementBaseObject mboDNS = mObj.GetMethodParameters("SetDNSServerSearchOrder");
     if (mboDNS != null)
     {
        mboDNS["DNSServerSearchOrder"] = null;
        mObj.InvokeMethod("SetDNSServerSearchOrder", mboDNS, null);
     }
  }
}