调用Win32_Service UserControlService无法正常工作

Question

I'm using WMI to install/start/stop etc. services on a remote machine. This is working nicely, only the invocation of the UserControlService seems to be a problem.

I know that it would also be possible to impersonate a user and then use the ServiceController class, but as I've already got all other methods I would rather keep the WMI code and get my method to send service control requests working.

Following code:

 public static string SendServiceControlRequest(string remoteHost, string serviceName, string username,
                                                 string password, int request)

    {
        ConnectionOptions theConnection = new ConnectionOptions();
        theConnection.Username = username;
        theConnection.Password = password;
        ManagementScope theScope = new ManagementScope(string.Format("\\\\{0}\\root\\cimv2", remoteHost), theConnection);
        using (ManagementObject theClass = new ManagementObject(theScope, new ManagementPath("Win32_Service"),
                                                           new ObjectGetOptions())) // causes an ArgumentOutOfRangeException (Parametername: path)
        {
            using (ManagementBaseObject inParams = theClass.GetMethodParameters("UserControlService"))
            {
                inParams["ControlCode"] = (Byte)request;

                ManagementBaseObject outParams = theClass.InvokeMethod("UserControlService", inParams, null);
                return outParams["ReturnValue"].ToString();
            }
        }
    }

Throws a System.Management.ManagementException complaining about invalid parameters (with request of 150, which should work). The exception is thrown on theClass.InvokeMethod I'm not sure why this happen, I'm getting the description of the method from:

http://msdn.microsoft.com/en-us/library/aa393952(v=vs.85).aspx

Edit: Working version with the corrections by Hans Passant:

  public static bool SendServiceControlRequest(string remoteHost, string serviceName, string username,
                                                 string password, int request)

    {
        ConnectionOptions theConnection = new ConnectionOptions();
        theConnection.Username = username;
        theConnection.Password = password;
        ManagementScope theScope = new ManagementScope(string.Format("\\\\{0}\\root\\cimv2", remoteHost),
                                                          theConnection);
        string servicePath = string.Format("Win32_Service.Name='{0}'", serviceName);
        ManagementPath path = new ManagementPath(servicePath);
        using (ManagementObject theClass = new ManagementObject(theScope, path,
                                                           new ObjectGetOptions()))
        {
            using (ManagementBaseObject inParams = theClass.GetMethodParameters("UserControlService"))
            {
                inParams["ControlCode"] = (Byte)request;

                ManagementBaseObject outParams = theClass.InvokeMethod("UserControlService", inParams, null);
                return outParams["ReturnValue"].ToString() == "0";
            }
        }
    }

Answer 1

Instead of

inParams["ControlCode"] = (Byte)request;

try

inParams.SetPropertyValue("ControlCode", (Byte)request);

EDIT

Untested, but this seems to be what you might be looking for:

Instead of

    using (ManagementBaseObject inParams = theClass.GetMethodParameters("UserControlService"))
    {
        inParams["ControlCode"] = (Byte)request;

        ManagementBaseObject outParams = theClass.InvokeMethod("UserControlService", inParams, null);
        return outParams["ReturnValue"].ToString();
    }

Try utilizing the ManagementClass instances (from http://social.msdn.microsoft.com/Forums/vstudio/en-US/1dbe4995-ce73-4f01-8d9a-6cf1650bce8a/wmi-c-managementclassinvokemethod-failure ):

    foreach (var instance in theClass.GetInstances())
    {
        using (ManagementBaseObject inParams = instance.GetMethodParameters("UserControlService"))
        {
            inParams["ControlCode"] = (Byte)request;

            ManagementBaseObject outParams = instance.InvokeMethod("UserControlService", inParams, null);
            return outParams["ReturnValue"].ToString();
        }
    }

Answer 2

Yes, there's a bug in your code. You correctly added a serviceName argument to your method but you forgot to actually use it. That's important, you really do have to be specific about what particular service you send this control code to.

Make it look like this instead:

  var path = string.Format("Win32_Service.Name='{0}'", serviceName);
  var thePath = new ManagementPath(path);
  var theClass = new ManagementObject(theScope, thePath, null);
  // etc...