现在，这个方法可能看起来 * 冗长 ，但我认为在调用WMI方法时，正确定义管理选项和作用域是很重要的。
这提供了在必要时纠正/调整代码以适应特定上下文的方法。
此外，这里的helper方法还可以重用来初始化任何其他WMI查询。
例如，当连接到WMIScope或执行WMI查询时，错误的*Impersonation**选项将导致异常（0x80070005: (E_ACCESSDENIED)）。

**PrintTestPage方法参数的说明：
string PrinterName：指定打印机的名称，或null以使用默认打印机。
string MachineName：网络中计算机的名称或null以使用LocalMachine**名称。

如果成功，该方法将返回0;如果未找到打印机，将引发异常。
使用本地计算机中的默认打印机打印测试页的示例调用：

var result = PrintTestPage(null, null);

using System.Linq;
using System.Management;

public static uint PrintTestPage(string PrinterName, string MachineName)
{
    ConnectionOptions connOptions = GetConnectionOptions();
    EnumerationOptions mOptions = GetEnumerationOptions(false);
    string machineName = string.IsNullOrEmpty(MachineName) ? Environment.MachineName : MachineName;
    ManagementScope mScope = new ManagementScope($@"\\{machineName}\root\CIMV2", connOptions);
    SelectQuery mQuery = new SelectQuery("SELECT * FROM Win32_Printer");
    mQuery.QueryString += string.IsNullOrEmpty(PrinterName) 
                        ? " WHERE Default = True" 
                        : $" WHERE Name = '{PrinterName}'";
    mScope.Connect();

    using (ManagementObjectSearcher moSearcher = new ManagementObjectSearcher(mScope, mQuery, mOptions))
    {
        ManagementObject moPrinter = moSearcher.Get().OfType<ManagementObject>().FirstOrDefault();
        if (moPrinter is null) throw new InvalidOperationException("Printer not found");

        InvokeMethodOptions moMethodOpt = new InvokeMethodOptions(null, ManagementOptions.InfiniteTimeout);
        using (ManagementBaseObject moParams = moPrinter.GetMethodParameters("PrintTestPage"))
        using (ManagementBaseObject moResult = moPrinter.InvokeMethod("PrintTestPage", moParams, moMethodOpt))
            return (UInt32)moResult["ReturnValue"];
    }
}

帮助器方法：

private static EnumerationOptions GetEnumerationOptions(bool DeepScan)
{
    EnumerationOptions mOptions = new EnumerationOptions()
    {
        Rewindable = false,        //Forward only query => no caching
        ReturnImmediately = true,  //Pseudo-async result
        DirectRead = true,         //Skip superclasses
        EnumerateDeep = DeepScan   //No recursion
    };
    return mOptions;
}

private static ConnectionOptions GetConnectionOptions()
{
    ConnectionOptions connOptions = new ConnectionOptions()
    {
        EnablePrivileges = true,
        Timeout = ManagementOptions.InfiniteTimeout,
        Authentication = AuthenticationLevel.PacketPrivacy,
        Impersonation = ImpersonationLevel.Impersonate
    };
    return connOptions;
}