public override object Clone()
{
BrowsePosition browsePosition = (BrowsePosition)MemberwiseClone();
browsePosition.Enumerator = Enumerator.Clone();
return(browsePosition);
}
public override BrowseElement[] BrowseNext(ref Opc.Da.BrowsePosition position)
{
lock (this)
{
if (m_server == null)
{
throw new NotConnectedException();
}
if (position == null && (object)position.GetType() != typeof(BrowsePosition))
{
throw new BrowseCannotContinueException();
}
BrowsePosition position2 = (BrowsePosition)position;
ItemIdentifier itemID = position2.ItemID;
BrowseFilters filters = position2.Filters;
ArrayList arrayList = new ArrayList();
if (position2.IsBranch)
{
BrowseElement[] elements = GetElements(arrayList.Count, itemID, filters, branches: true, ref position2);
if (elements != null)
{
arrayList.AddRange(elements);
}
position = position2;
if (position != null)
{
return((BrowseElement[])arrayList.ToArray(typeof(BrowseElement)));
}
}
if (filters.BrowseFilter != browseFilter.branch)
{
BrowseElement[] elements2 = GetElements(arrayList.Count, itemID, filters, branches: false, ref position2);
if (elements2 != null)
{
arrayList.AddRange(elements2);
}
position = position2;
}
return((BrowseElement[])arrayList.ToArray(typeof(BrowseElement)));
}
}
public override BrowseElement[] Browse(ItemIdentifier itemID, BrowseFilters filters, out Opc.Da.BrowsePosition position)
{
if (filters == null)
{
throw new ArgumentNullException("filters");
}
position = null;
lock (this)
{
if (m_server == null)
{
throw new NotConnectedException();
}
BrowsePosition position2 = null;
ArrayList arrayList = new ArrayList();
if (filters.BrowseFilter != browseFilter.item)
{
BrowseElement[] elements = GetElements(arrayList.Count, itemID, filters, branches: true, ref position2);
if (elements != null)
{
arrayList.AddRange(elements);
}
position = position2;
if (position != null)
{
return((BrowseElement[])arrayList.ToArray(typeof(BrowseElement)));
}
}
if (filters.BrowseFilter != browseFilter.branch)
{
BrowseElement[] elements2 = GetElements(arrayList.Count, itemID, filters, branches: false, ref position2);
if (elements2 != null)
{
arrayList.AddRange(elements2);
}
position = position2;
}
return((BrowseElement[])arrayList.ToArray(typeof(BrowseElement)));
}
}
private BrowseElement[] GetElements(int elementsFound, ItemIdentifier itemID, BrowseFilters filters, bool branches, ref BrowsePosition position)
{
EnumString enumString = null;
if (position == null)
{
IOPCBrowseServerAddressSpace iOPCBrowseServerAddressSpace = (IOPCBrowseServerAddressSpace)m_server;
OPCNAMESPACETYPE pNameSpaceType = OPCNAMESPACETYPE.OPC_NS_HIERARCHIAL;
try
{
iOPCBrowseServerAddressSpace.QueryOrganization(out pNameSpaceType);
}
catch (Exception e)
{
throw Interop.CreateException("IOPCBrowseServerAddressSpace.QueryOrganization", e);
}
if (pNameSpaceType == OPCNAMESPACETYPE.OPC_NS_FLAT)
{
if (branches)
{
return(new BrowseElement[0]);
}
if (itemID != null && itemID.ItemName != null && itemID.ItemName.Length > 0)
{
throw new ResultIDException(ResultID.Da.E_UNKNOWN_ITEM_NAME);
}
}
enumString = GetEnumerator(itemID?.ItemName, filters, branches, pNameSpaceType == OPCNAMESPACETYPE.OPC_NS_FLAT);
}
else
{
enumString = position.Enumerator;
}
ArrayList arrayList = new ArrayList();
BrowseElement browseElement = null;
int num = 0;
string[] array = null;
if (position != null)
{
num = position.Index;
array = position.Names;
position = null;
}
do
{
if (array != null)
{
for (int i = num; i < array.Length; i++)
{
if (filters.MaxElementsReturned != 0 && filters.MaxElementsReturned == arrayList.Count + elementsFound)
{
position = new BrowsePosition(itemID, filters, enumString, branches);
position.Names = array;
position.Index = i;
break;
}
browseElement = GetElement(itemID, array[i], filters, branches);
if (browseElement == null)
{
break;
}
arrayList.Add(browseElement);
}
}
if (position != null)
{
break;
}
array = enumString.Next(10);
num = 0;
}while (array != null && array.Length > 0);
if (position == null)
{
enumString.Dispose();
}
return((BrowseElement[])arrayList.ToArray(typeof(BrowseElement)));
}
