將DNS設置爲'以編程方式自動獲取'

Question

在.NET上使用C＃時，如何將DNS服務器設置爲'自動獲取'？我可以將IP地址設置爲所需的值。

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); 
    } 
    } 
} 

我試過設置IP地址都爲空，像sIps = { null, null };，但最終根本改變設置。

Answer 1

嘗試將DNSServerSearchOrder設置爲null，而不是使用空字符串數組。

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); 
    } 
    } 
}