求助关于通过ManagementObjectSearcher读取串口信息的问题！

[gaoxing_1985007]

做专案要实现一个功能，读取串口的详细信息，比如：USB Serial Port (COM4)
网上找了以下代码：

public static string[] MulGetHardwareInfo(HardwareEnum hardType, string propKey)
        {
            List<string> strs = new List<string>();
            try
            {
                using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("select * from " + hardType))
                {
                    var hardInfos = searcher.Get();
                    foreach (var hardInfo in hardInfos)
                    {
                        if (hardInfo.Properties[propKey].Value.ToString().Contains("COM"))
                        {
                            strs.Add(hardInfo.Properties[propKey].Value.ToString());
                        }

                    }
                    searcher.Dispose();
                }
                return strs.ToArray();
            }
            catch
            {
                return null;
            }
            finally
            {
                strs = null;
            }
        }

上面的代码可以实现功能，win7 64位电脑读出串口的信息，但是在有些win7 32位系统下读取不到信息，有些可以读到，是不是有些电脑系统缺少东西，是精简版系统，所以读不出来？有没有哪位高人知道系统缺少了什么东西？或者是其它原因导致？

[gaoxing_1985007]

自己顶一下，别沉了啊

[_瑶瑶_]

private void getPortDeviceName()
{
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher
("select * from Win32_PnPEntity where Name like '%(COM%'"))
{
var hardInfos = searcher.Get();
foreach (var hardInfo in hardInfos)
{
if (hardInfo.Properties["Name"].Value != null)
{
string deviceName = hardInfo.Properties["Name"].Value.ToString();
Console.WriteLine(deviceName);
}
}
}
}

[_瑶瑶_]

private void getPortDeviceName()
{
	using (ManagementObjectSearcher searcher = new ManagementObjectSearcher
	("select * from Win32_PnPEntity where Name like '%(COM%'"))
	{
		var hardInfos = searcher.Get();
		foreach (var hardInfo in hardInfos)
		{
			if (hardInfo.Properties["Name"].Value != null)
			{
				string deviceName = hardInfo.Properties["Name"].Value.ToString();
				Console.WriteLine(deviceName);
			}
		}
	}
}

[qq_15197419]

我也是win10下报错：未将对象实例化。代码和题主一模一样。hardInfo.Properties["Name"].Value一定要做null判断！有的系统遍历时有的节点根本没有name属性！

[XiaoPangZhui_tt]

我也是类似问题，请问一下为什么这段代码在Win7下功能可以实现，而在Win10下不能实现
void GetPrintJobs()
{
this.PrinterJobs.Clear();

string searchQuery;

ManagementObjectSearcher searchPrintJobs;
ManagementObjectCollection prntJobCollection;
try
{
searchQuery = "SELECT * FROM Win32_PrintJob";
searchPrintJobs = new ManagementObjectSearcher(searchQuery);
prntJobCollection = searchPrintJobs.Get();
foreach (ManagementObject prntJob in prntJobCollection)
{
PrinterJob pjob = new PrinterJob();
pjob.JobName = prntJob.Properties["Document"].Value.ToString();
pjob.JobId = prntJob.Properties["JobId"].Value.ToString();
PrinterJobs.Add(pjob);
}

}
catch (Exception sysException)
{
LogService.Log(sysException.Message, LogType.Info, @"log.lg");
}
}