如何使用 VMware vSphere SDK 获取没有分布式端口组的 ESXi 中标准交换机中的端口组列表

我设法在Sandard交换机中获取了所有端口组，但该列表包括分布式vSwitch中的分布式端口组，它包含在标准交换机结构中。我不希望在我的情况下这样做。

我正在使用VMware vSphere SDK（5.5），我尝试了这个：

    public List<Network> GetPortGroups(VimClient vimClient, Datacenter selectedDC = null, string pgName = null)
    {
        List<Network> lstPortGroups = new List<Network>();
        NameValueCollection pgFilter = new NameValueCollection();
        ManagedObjectReference DcMoRef = new ManagedObjectReference();
        if (pgName != null)
        {
            pgFilter.Add("name", pgName);
        }
        else
        {
            pgFilter = null;
        }
        if (selectedDC != null)
        {
            DcMoRef = selectedDC.MoRef;
        }
        else
        {
            DcMoRef = null;
        }
        List<EntityViewBase> appPortGroups = vimClient.FindEntityViews(typeof(Network), DcMoRef, pgFilter, null);
        if (appPortGroups != null)
        {
            foreach (EntityViewBase appPortGroup in appPortGroups)
            {
                Network thisPortGroup = (Network)appPortGroup;
                lstPortGroups.Add(thisPortGroup);
            }
            return lstPortGroups;
        }
        else
        {
            return null;
        }
    }

    public List<Network> GetStandardPgs(Datacenter selectedDC = null)
    {
        List<Network> lstPortGroups = new List<Network>();
        ManagedObjectReference DcMoRef = new ManagedObjectReference();
        if (selectedDC != null)
        {
            DcMoRef = selectedDC.MoRef;
        }
        else
        {
            DcMoRef = null;
        }
        List<EntityViewBase> appPortGroups = _vmwarecontext.FindEntityViews(typeof(Network), DcMoRef, null, null);
        if (appPortGroups != null)
        {
            foreach (EntityViewBase appPortGroup in appPortGroups.Where(x => x.GetType() == typeof(Network)))
            {
                lstPortGroups.Add((Network)appPortGroup);
            }
            return lstPortGroups;
        }
        else
        {
            return null;
        }
    }