CODEWITHSUNDEEP
c#wmihyper-v
btlog
btlog

Reputation: 4780

Create VM with WMI in c#

I am trying to create a VM in Hyper-V with WMI. 

        ManagementClass virtualSystemManagementService = 
            new ManagementClass(@"root\virtualization\v2:Msvm_VirtualSystemManagementService");

        ManagementBaseObject inParams = 
            virtualSystemManagementService
                .GetMethodParameters("DefineSystem");

        // Add the input parameters.
        ManagementClass virtualSystemSettingData = 
            new ManagementClass(@"root\virtualization\v2:Msvm_VirtualSystemSettingData")
        {
            ["ElementName"] = "Test"
        };

        inParams["SystemSettings"] = 
            virtualSystemSettingData.GetText(TextFormat.CimDtd20);

        // Execute the method and obtain the return values.
        ManagementBaseObject outParams = 
            virtualSystemManagementService
                .InvokeMethod("DefineSystem", inParams, null);

The call to InvokeMethod throws an System.Management.MangementException - "Invalid method Parameter(s).

I am basing this code on https://blogs.msdn.microsoft.com/virtual_pc_guy/2013/06/20/creating-a-virtual-machine-with-wmi-v2/

I do realize that this is really easy with powershell, but I am trying to understand how the WMI side of things works.

Upvotes: 0

Views: 1962

Answers (2)

ppavlov
ppavlov

Reputation: 488

Basic workflow For Virtual Machine Creation using WMI with C#:

You missed creating an instance of VirtualSystemSettingData and getting an instance of VirtualSystemManagment Service. The exception System.Management.MangementException - "Invalid method Parameter(s) is thrown when you call invoke method on a class not an object!

  1. Create VirtualSystemSettingData class
  2. Add Properties
  3. Create new VirtualSystemSettingData instance
  4. Convert to text
  5. Pass to params
  6. Create VirtualSystemManagementService class
  7. Get existing VirtualSystemManagementService instance
  8. Invoke Method

Example: 

         ManagementClass virtualSystemManagementServiceClass =
            new ManagementClass(@"root\virtualization\v2:Msvm_VirtualSystemManagementService");

        ManagementBaseObject inParams =
            virtualSystemManagementServiceClass
                .GetMethodParameters("DefineSystem");

        // Add the input parameters.
        ManagementClass virtualSystemSettingDataClass =
            new ManagementClass(@"root\virtualization\v2:Msvm_VirtualSystemSettingData")
            {
                ["ElementName"] = "Test"
            };

        // Create Instance of VirtualSystemSettingData
        ManagementObject virtualSystemSettingData = virtualSystemSettingDataClass.CreateInstance();

        inParams["SystemSettings"] =
            virtualSystemSettingData.GetText(TextFormat.CimDtd20);

        // Get Instance of VirtualSystemManagmentService
        ManagementObject virtualSystemManagementService = null;
        foreach (ManagementObject instance in virtualSystemManagementServiceClass.GetInstances())
        {
            virtualSystemManagementService = instance;
            break;
        }

        // Execute the method and obtain the return values.
        ManagementBaseObject outParams = virtualSystemManagementService.InvokeMethod("DefineSystem", inParams, null);

Upvotes: 1

Luzius
Luzius

Reputation: 194

You need to create an instance of msvm_VirtualSystemSettingData.

   ManagementObject newInstance = new ManagementClass(scope, new ManagementPath("Msvm_VirtualSystemSettingData"), null).CreateInstance();
   newInstance["ElementName"] = vmName;
   inParameters["SystemSettings"] = newInstance.GetText(TextFormat.CimDtd20);

Upvotes: 0

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