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POInvocation of Win32_Service UserControlService not working
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copied!<p>I'm using WMI to install/start/stop etc. services on a remote machine. This is working nicely, only the invocation of the <code>UserControlService</code> seems to be a problem.</p> <p>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.</p> <p>Following code:</p> <pre><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(); } } } </code></pre> <p>Throws a <code>System.Management.ManagementException</code> complaining about invalid parameters (with request of 150, which should work). The exception is thrown on <code>theClass.InvokeMethod</code> I'm not sure why this happen, I'm getting the description of the method from:</p> <p><a href="http://msdn.microsoft.com/en-us/library/aa393952(v=vs.85).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/aa393952(v=vs.85).aspx</a></p> <p>Edit: Working version with the corrections by Hans Passant:</p> <pre><code> 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"; } } } </code></pre>

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