“你调用的对象是空的。”

Question

我正在尝试检索IP地址。 但它正在给出这个例外

  

对象引用未设置为对象的实例。

ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\cimv2");
ObjectQuery query1 = new ObjectQuery("SELECT * FROM Win32_NetworkAdapterConfiguration");
ManagementObjectSearcher searcher1 = new ManagementObjectSearcher(scope, query1);
ManagementObjectCollection queryCollection = searcher1.Get();

foreach (ManagementObject m in queryCollection)
{

    listBox2.Items.Add(m["DefaultIPGateway"].ToString());
}

Answer 1

尝试调试，但它看起来像下面之一：

1. searcher1为空。
2. 在foreach中，m [“DefaultIPGateway”]返回null
3. listbox2为空。

Answer 2

尝试：

ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\cimv2");
ObjectQuery query1 = new ObjectQuery("SELECT * FROM Win32_NetworkAdapterConfiguration");
ManagementObjectSearcher searcher1 = new ManagementObjectSearcher(scope, query1);
ManagementObjectCollection queryCollection = searcher1.Get();

foreach (ManagementObject m in queryCollection)
{
   if(m["DefaultIPGateway"] != null)
   {
     listBox2.Items.Add(m["DefaultIPGateway"].ToString());
   }
}