public IList <DirectoryEntry> GetVmAdStaleEntries(IList <RemoteAppVm> vmList, ActiveDirectoryConfig adConfig, PSCredential credential)
{
Dictionary <string, string> vmPrefixes = new Dictionary <string, string>();
List <DirectoryEntry> staleVmEntries = null;
foreach (RemoteAppVm vm in vmList)
{
string vmNamePrefix = vm.VirtualMachineName.Substring(0, 8);
// for each VM group with the same 8-character prefix, find the "minimum" VM name.
// i.g, for VMs "abcdefgh0004", "abcdefgh0002", "abcdefgh0005", "abcdefgh0003" the minimum will be "abcdefgh0002"
// this will be used later to determine which AD entries are stale
// because each staleVMName < MIN(existingVMName) using regular case-insensitive alphanumerical comparison
if (vmPrefixes.ContainsKey(vmNamePrefix))
{
if (String.Compare(vm.VirtualMachineName, vmPrefixes[vmNamePrefix], StringComparison.OrdinalIgnoreCase) < 0)
{
vmPrefixes[vmNamePrefix] = vm.VirtualMachineName;
}
}
else
{
vmPrefixes.Add(vmNamePrefix, vm.VirtualMachineName);
}
}
staleVmEntries = new List <DirectoryEntry>();
foreach (string vmNamePrefix in vmPrefixes.Keys)
{
IList <DirectoryEntry> adEntries = ActiveDirectoryHelper.GetVmAdEntries(
adConfig.DomainName,
adConfig.OrganizationalUnit,
vmNamePrefix,
credential);
string maxName = vmPrefixes[vmNamePrefix];
foreach (DirectoryEntry adEntry in adEntries)
{
string name = ActiveDirectoryHelper.GetCN(adEntry);
if ((name.Length == AdHelper.VMNameLength) && (String.Compare(name, maxName, StringComparison.OrdinalIgnoreCase) < 0))
{
staleVmEntries.Add(adEntry);
}
}
}
return(staleVmEntries);
}