Question

我有一些代码可以从C＃中的WMI中获取一些信息，用于连接到计算机的显示器。代码是这样的......

String queryString = "Select * from Win32_DesktopMonitor";
ManagementObjectSearcher searcher = new ManagementObjectSearcher(queryString)
foreach (ManagementObject obj in searcher.Get())
{
    ...
}

如何在枚举期间计算从此查询返回的对象数量？

对此非常新，所以要温柔！： - ）

Answer 1

我认为你必须运行Get()函数才能获得对象的数量：

  String queryString = "Select * from Win32_DesktopMonitor";
  ManagementObjectSearcher searcher = new ManagementObjectSearcher(queryString);
  MessageBox.Show("Found: " + searcher.Get().Count.ToString());

Answer 2

我想你不要问：

String queryString = "Select * from Win32_DesktopMonitor";
ManagementObjectSearcher searcher = new ManagementObjectSearcher(queryString);
Int32 i = 0;
foreach (ManagementObject obj in searcher.Get())
{
  i++;
}
// I have one computer so, i = 1

Answer 3

这里的最佳方法是Count in Classes ManagementObjectColletion或ManagementObjectSearcher。如果你要使用结果，那么它的优点是：

Array ( [0] => 248, 242 )

并对大小进行验证：

ManagementObjectCollection jobs = searchJob.Get();

如何从ManagementObject搜索中获取计数？

3 个答案: