uint32 CreateSwitch(
  [in]   string Name,
  [in]   string FriendlyName,
  [in]   uint32 NumLearnableAddresses,
  [in]   string ScopeOfResidence,
  [out]  Msvm_VirtualSwitch REF CreatedVirtualSwitch
);

using System;
using System.Management;

namespace HyperVSamples
{
    class CreateSwitchClass
    {
        static ManagementObject CreateSwitch(string name, string friendlyName, int learnableAddress)
        {
            ManagementScope scope = new ManagementScope(@"root\virtualization", null);
            ManagementObject switchService = Utility.GetServiceObject(scope, "Msvm_VirtualSwitchManagementService");

            ManagementObject createdSwitch = null;

            ManagementBaseObject inParams = switchService.GetMethodParameters("CreateSwitch");
            inParams["FriendlyName"] = friendlyName;
            inParams["Name"] = name;
            inParams["NumLearnableAddresses"] = learnableAddress;
            inParams["ScopeofResidence"] = null;
            ManagementBaseObject outParams = switchService.InvokeMethod("CreateSwitch", inParams, null);
            if ((UInt32)outParams["ReturnValue"] == ReturnCode.Completed)
            {
                Console.WriteLine("{0} was created successfully", inParams["Name"]);
                createdSwitch = new ManagementObject(outParams["CreatedVirtualSwitch"].ToString());
            }
            else
            {
                Console.WriteLine("Failed to create {0} switch.", inParams["Name"]);
            }
            return createdSwitch;
        }

        static void Main(string[] args)
        {
            if (args != null && args.Length != 3)
            {
                Console.WriteLine("Usage: CreateSwitch name friendlyName NumLearnableAddresses");
                Console.WriteLine("Example: CreateSwitch FirstSwitch \"My First Switch\" 1024");
                return;
            }
            CreateSwitch(args[0], args[1], int.Parse(args[2]));
        }
    }
}

option explicit 

dim objWMIService
dim switchService
dim fileSystem

const wmiStarted = 4096
const wmiSuccessful = 0

Main()

'-----------------------------------------------------------------
' Main
'-----------------------------------------------------------------
Sub Main()

    dim name, friendlyName, learnableAddress
    dim computer, objArgs, createdSwitch

    set objArgs = WScript.Arguments
    if WScript.Arguments.Count = 3 then
       name = objArgs.Unnamed.Item(0)
       friendlyName = objArgs.Unnamed.Item(1)
       learnableAddress = objArgs.Unnamed.Item(2)
    else
       WScript.Echo "usage: cscript CreateSwitch.vbs name friendlyName learnableAddress"
       WScript.Echo "Example: CreateSwitch FirstSwitch ""My First Switch"" 1024"
       WScript.Quit(1)
    end if
    
    set fileSystem = Wscript.CreateObject("Scripting.FileSystemObject")
    computer = "."

    set objWMIService = GetObject("winmgmts:\\" & computer & "\root\virtualization")
    set switchService = objWMIService.ExecQuery("select * from Msvm_VirtualSwitchManagementService").ItemIndex(0)
        
    set createdSwitch = CreateSwitch(name, friendlyName, learnableAddress)
    
    if createdSwitch Is Nothing then
        WriteLog "CreateSwitch failed."
        WScript.Quit(1)
    else
        WriteLog "Done"
        WScript.Quit(0)
    end if

End Sub

'-----------------------------------------------------------------
' Create a virtual switch by calling CreateSwitch WMI method
'-----------------------------------------------------------------
Function CreateSwitch(name, friendlyName, learnableAddress)

    dim objInParam, objOutParams
    
    set CreateSwitch = Nothing
    set objInParam = switchService.Methods_("CreateSwitch").InParameters.SpawnInstance_()
    objInParam.FriendlyName = friendlyName
    objInParam.Name = name
    objInParam.NumLearnableAddresses = learnableAddress
    objInParam.ScopeofResidence = null

    set objOutParams = switchService.ExecMethod_("CreateSwitch", objInParam)
    
    if objOutParams.ReturnValue = wmiSuccessful then
        set CreateSwitch = objWMIService.Get(objOutParams.CreatedVirtualSwitch)
    else
        WriteLog Format1("CreateSwitch failed with error code {0}", objOutParams.ReturnValue)
    end if

End Function

'-----------------------------------------------------------------
' Create the console log files.
'-----------------------------------------------------------------
Sub WriteLog(line)
    dim fileStream
    set fileStream = fileSystem.OpenTextFile(".\CreateSwitch.log", 8, true)
    WScript.Echo line
    fileStream.WriteLine line
    fileStream.Close

End Sub

'------------------------------------------------------------------------------
' The string formating functions to avoid string concatenation.
'------------------------------------------------------------------------------
Function Format1(myString, arg0)
    Format1 = Replace(myString, "{0}", arg0)
End Function