How to browse ObjectTypes in Server side?

[Eskeptor]

Type of issue

• Bug
• Enhancement
• Compliance
• Question
• Help wanted

Current Behavior

I configured the source code as below to explore the primary node that occurs when I create a server.
(All nodes under "Root")

// First input : nodeId = ObjectIds.RootFolder
//               nDepth = 1
private string RecursiveFind(NodeId nodeId, int nDepth)
{
    StringBuilder stringBuilder = new StringBuilder();
    BrowseDescriptionCollection nodesToBrowse = new BrowseDescriptionCollection();
    BrowseDescription nodeToBrowse = new BrowseDescription
    {
        NodeId = nodeId,
        NodeClassMask = (uint)(NodeClass.Object | NodeClass.Variable | NodeClass.Method | NodeClass.DataType | 
                                      NodeClass.ReferenceType),
        ResultMask = (uint)BrowseResultMask.All,
        IncludeSubtypes = false,
    };
    nodesToBrowse.Add(nodeToBrowse);

    OperationContext context = new OperationContext(new RequestHeader(), RequestType.Browse);

    _server.CurrentInstance.NodeManager.Browse(
        context,
        null,
        0,
        nodesToBrowse,
        out BrowseResultCollection results,
        out DiagnosticInfoCollection diagnosticInfos);

    string strSpace = MakeSpace(nDepth);	// Just space
    ReferenceDescriptionCollection nodeReferences = results[0].References;

    if (nodeReferences == null)
        return string.Empty;

    if (nodeReferences.Count == 0)
        return string.Empty;

    nodeReferences.Sort((ReferenceDescription x, ReferenceDescription y) => x.DisplayName.Text.CompareTo(y.DisplayName.Text));

    foreach (ReferenceDescription refFind in nodeReferences)
    {
        stringBuilder.AppendLine($"{strSpace}+ {refFind.DisplayName}, {refFind.BrowseName}, {refFind.NodeClass}");
        string strResult = RecursiveFind(ExpandedNodeId.ToNodeId(refFind.NodeId, _server.NamespaceUris), nDepth + 1);
        if (!string.IsNullOrEmpty(strResult))
            stringBuilder.AppendLine(strResult);
    }

    return stringBuilder.ToString();
}

It works.

=  DisplayName, BrowseName, NodeClass =======
 + Objects, Objects, Object
  + Aliases, Aliases, Object
   + FindAlias, FindAlias, Method
    + InputArguments, InputArguments, Variable
    + OutputArguments, OutputArguments, Variable
   + TagVariables, TagVariables, Object
    + FindAlias, FindAlias, Method
     + InputArguments, InputArguments, Variable
     + OutputArguments, OutputArguments, Variable
   + Topics, Topics, Object
    + FindAlias, FindAlias, Method
     + InputArguments, InputArguments, Variable
     + OutputArguments, OutputArguments, Variable
  + Server, Server, Object
   + Auditing, Auditing, Variable
   + Dictionaries, Dictionaries, Object
   + EstimatedReturnTime, EstimatedReturnTime, Variable
   + GetMonitoredItems, GetMonitoredItems, Method
    + InputArguments, InputArguments, Variable
    + OutputArguments, OutputArguments, Variable

... Skip...

However, "NodeClass" in "NodeClassMask" to read the sub-node of the "Types" part.Adding "ObjectType" will result in an "Overflow" error.

    BrowseDescription nodeToBrowse = new BrowseDescription
    {
        NodeId = nodeId,
        NodeClassMask = (uint)(NodeClass.Object | NodeClass.Variable | NodeClass.Method | NodeClass.DataType | 
                                      NodeClass.ReferenceType | NodeClass.ObjectType), // <<----- Here
        ResultMask = (uint)BrowseResultMask.All,
        IncludeSubtypes = false,
    };

Is there a way to get the entire sub-node of the "Types" part?
(VariableTypes too.)

Thank you.

Expected Behavior

No response

Steps To Reproduce

No response

Environment

- OS: Windows 10
- Environment: Visual Studio 2022 17.6.3
- Runtime: .NET 6.0
- Nuget Version: 1.4.371.96
- Component: Opc.Ua.Core, Opc.Ua.Server
- Server: ReverseConnectServer
- Client: UA Expert

Anything else?

No response

[EthanChangAED]

Converting this question to a Q&A discussion.