public override BrowseElement[] BrowseNext(ref Opc.Da.BrowsePosition position)
{
lock (this)
{
if (base.m_server == null)
{
throw new NotConnectedException();
}
if ((position == null) && (position.GetType() != typeof(OpcCom.Da20.BrowsePosition)))
{
throw new BrowseCannotContinueException();
}
OpcCom.Da20.BrowsePosition position2 = (OpcCom.Da20.BrowsePosition)position;
ItemIdentifier itemID = position2.ItemID;
BrowseFilters filters = position2.Filters;
ArrayList list = new ArrayList();
if (position2.IsBranch)
{
BrowseElement[] c = this.GetElements(list.Count, itemID, filters, true, ref position2);
if (c != null)
{
list.AddRange(c);
}
position = position2;
if (position != null)
{
return((BrowseElement[])list.ToArray(typeof(BrowseElement)));
}
}
if (filters.BrowseFilter != browseFilter.branch)
{
BrowseElement[] elementArray2 = this.GetElements(list.Count, itemID, filters, false, ref position2);
if (elementArray2 != null)
{
list.AddRange(elementArray2);
}
position = position2;
}
return((BrowseElement[])list.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 (base.m_server == null)
{
throw new NotConnectedException();
}
OpcCom.Da20.BrowsePosition position2 = null;
ArrayList list = new ArrayList();
if (filters.BrowseFilter != browseFilter.item)
{
BrowseElement[] c = this.GetElements(list.Count, itemID, filters, true, ref position2);
if (c != null)
{
list.AddRange(c);
}
position = position2;
if (position != null)
{
return((BrowseElement[])list.ToArray(typeof(BrowseElement)));
}
}
if (filters.BrowseFilter != browseFilter.branch)
{
BrowseElement[] elementArray2 = this.GetElements(list.Count, itemID, filters, false, ref position2);
if (elementArray2 != null)
{
list.AddRange(elementArray2);
}
position = position2;
}
return((BrowseElement[])list.ToArray(typeof(BrowseElement)));
}
}
public override object Clone()
{
OpcCom.Da20.BrowsePosition position = (OpcCom.Da20.BrowsePosition)base.MemberwiseClone();
position.Enumerator = this.Enumerator.Clone();
return(position);
}
private BrowseElement[] GetElements(int elementsFound, ItemIdentifier itemID, BrowseFilters filters, bool branches, ref OpcCom.Da20.BrowsePosition position)
{
EnumString enumerator = null;
if (position == null)
{
IOPCBrowseServerAddressSpace server = (IOPCBrowseServerAddressSpace)base.m_server;
OPCNAMESPACETYPE pNameSpaceType = OPCNAMESPACETYPE.OPC_NS_HIERARCHIAL;
try
{
server.QueryOrganization(out pNameSpaceType);
}
catch (Exception exception)
{
throw OpcCom.Interop.CreateException("IOPCBrowseServerAddressSpace.QueryOrganization", exception);
}
if ((pNameSpaceType == OPCNAMESPACETYPE.OPC_NS_FLAT) && branches)
{
return(new BrowseElement[0]);
}
enumerator = this.GetEnumerator((itemID != null) ? itemID.ItemName : null, filters, branches);
}
else
{
enumerator = position.Enumerator;
}
ArrayList list = new ArrayList();
BrowseElement element = null;
int index = 0;
string[] names = null;
if (position != null)
{
index = position.Index;
names = position.Names;
position = null;
}
Label_0089:
if (names != null)
{
for (int i = index; i < names.Length; i++)
{
if ((filters.MaxElementsReturned != 0) && (filters.MaxElementsReturned == (list.Count + elementsFound)))
{
position = new OpcCom.Da20.BrowsePosition(itemID, filters, enumerator, branches);
position.Names = names;
position.Index = i;
break;
}
element = this.GetElement(names[i], filters, branches);
if (element == null)
{
break;
}
list.Add(element);
}
}
if (position == null)
{
names = enumerator.Next(10);
index = 0;
if ((names != null) && (names.Length > 0))
{
goto Label_0089;
}
}
if (position == null)
{
enumerator.Dispose();
}
return((BrowseElement[])list.ToArray(typeof(BrowseElement)));
}
