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POApplying a snapshot in Hyper-V WMI V2 from C#
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  1. POApplying a snapshot in Hyper-V WMI V2 from C#
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    copied!<p>I am trying to replicate the following PowerShell in C#:</p> <pre><code># Details from here are not particularly important but needed for full sample $vms = gwmi -namespace "root\virtualization\v2" Msvm_ComputerSystem $vm = $vms[3] $snapshot = ($vm.GetRelated("Msvm_VirtualSystemSettingData") | Where { $_.ElementName -eq "SnapshotName" })[0] # end unimportant $VMSS = Get-WMiObject -class Msvm_VirtualSystemSnapshotService -namespace root\virtualization\v2 $VMSS.ApplySnapshot($snapshot, $null) </code></pre> <p>This code works fine - the snapshot applies as expected.</p> <p>I have no problem getting the <code>Msvm_VirtualSystemSettingData</code> instance or a <code>Msvm_VirtualSystemSnapshostService</code> instance in C#. However, I can't seem to get the call to <code>ApplySnapshot</code> right - no matter what I give it I get an <code>InvalidOperationException</code>. I'm using generated WMI code from Visual Studio for the call:</p> <pre><code>public uint ApplySnapshot(ref System.Management.ManagementPath Job, System.Management.ManagementPath Snapshot) { if ((isEmbedded == false)) { System.Management.ManagementBaseObject inParams = null; inParams = PrivateLateBoundObject.GetMethodParameters("ApplySnapshot"); // following line has been through variations as well with no change - // commenting it out, setting to null inParams["Job"] = ((System.Management.ManagementPath)(Job)).Path; inParams["Snapshot"] = ((System.Management.ManagementPath)(Snapshot)).Path; System.Management.ManagementBaseObject outParams = PrivateLateBoundObject.InvokeMethod("ApplySnapshot", inParams, null); Job = ((System.Management.ManagementPath)(outParams.Properties["Job"].Value)); return System.Convert.ToUInt32(outParams.Properties["ReturnValue"].Value); } else { return System.Convert.ToUInt32(0); } } </code></pre> <p>I'm not sure what to pass for the <code>Job</code> parameter either, since we get a job back - it's very unusual to have a <code>ref</code> for that instead of an <code>out</code> but I've tried a bunch of different variations around that (including setting the parameter to <code>null</code> and not setting it at all) with no luck. I've also tried setting <code>inParams[Job]</code> to <code>null</code> with no luck for that either.</p> <p>What should I change to make this work?</p>
 

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