private static List<NodeId> FindTargetOfReference(Session session, List<NodeId> nodeIds, NodeId referenceTypeId, bool throwOnError)
{
try
{
// construct browse request.
BrowseDescriptionCollection nodesToBrowse = new BrowseDescriptionCollection();
for (int ii = 0; ii < nodeIds.Count; ii++)
{
BrowseDescription nodeToBrowse = new BrowseDescription();
nodeToBrowse.NodeId = nodeIds[ii];
nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
nodeToBrowse.ReferenceTypeId = referenceTypeId;
nodeToBrowse.IncludeSubtypes = false;
nodeToBrowse.NodeClassMask = 0;
nodeToBrowse.ResultMask = (uint)BrowseResultMask.None;
nodesToBrowse.Add(nodeToBrowse);
}
// start the browse operation.
BrowseResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
session.Browse(
null,
null,
1,
nodesToBrowse,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToBrowse);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToBrowse);
List<NodeId> targetIds = new List<NodeId>();
ByteStringCollection continuationPoints = new ByteStringCollection();
for (int ii = 0; ii < nodeIds.Count; ii++)
{
targetIds.Add(null);
// check for error.
if (StatusCode.IsBad(results[ii].StatusCode))
{
continue;
}
// check for continuation point.
if (results[ii].ContinuationPoint != null && results[ii].ContinuationPoint.Length > 0)
{
continuationPoints.Add(results[ii].ContinuationPoint);
}
// get the node id.
if (results[ii].References.Count > 0)
{
if (NodeId.IsNull(results[ii].References[0].NodeId) || results[ii].References[0].NodeId.IsAbsolute)
{
continue;
}
targetIds[ii] = (NodeId)results[ii].References[0].NodeId;
}
}
// release continuation points.
if (continuationPoints.Count > 0)
{
session.BrowseNext(
null,
true,
continuationPoints,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToBrowse);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToBrowse);
}
//return complete list.
return targetIds;
}
catch (Exception exception)
{
if (throwOnError)
{
throw new ServiceResultException(exception, StatusCodes.BadUnexpectedError);
}
return null;
}
}