public void BeginEdit()
{
try
{
_scope = _modelItem.BeginEdit();
_session = new UaSession {
EndpointUrl = Session.EndpointUrl
};
if (_session != null)
{
try
{
NamespaceItems.Clear();
var root = new ReferenceDescriptionViewModel(new ReferenceDescription {
DisplayName = "Objects", NodeId = new NodeId(Objects.ObjectsFolder, 0)
}, null, LoadChildren);
NamespaceItems.Add(root);
root.IsExpanded = true;
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
internal static async Task <Type> GetDataTypeFromNodeId(this UaSession session, NodeId nodeId)
{
var readRequest = new ReadRequest {
NodesToRead = { new ReadValueId {
NodeId = nodeId, AttributeId = Attributes.DataType
}, new ReadValueId{
NodeId = nodeId, AttributeId = Attributes.ValueRank
} }
};
var readResponse = await session.ReadAsync(readRequest);
var dataType = readResponse.Results[0].GetValue(NodeId.Null);
var valueRank = readResponse.Results[1].GetValue(-2);
var type = TypeInfo.GetSystemType(dataType, session.Factory);
if (type != null)
{
if (valueRank > 0)
{
return(type.MakeArrayType(valueRank));
}
return(type);
}
return(typeof(object));
}
public void CancelEdit()
{
try
{
_scope.Revert();
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
finally
{
_scope.Dispose();
_scope = null;
if (_session != null)
{
_session.Close();
_session = null;
}
}
}
internal static async Task <Tuple <Argument[], Argument[]> > GetMethodArgumentsFromNodeId(this UaSession session, NodeId nodeId)
{
var inputArguments = new Argument[0];
var outputArguments = new Argument[0];
var translateRequest = new TranslateBrowsePathsToNodeIdsRequest {
BrowsePaths = { new BrowsePath {
StartingNode = nodeId, RelativePath = new RelativePath(ReferenceTypeIds.HasProperty, "InputArguments")
}, new BrowsePath{
StartingNode = nodeId, RelativePath = new RelativePath(ReferenceTypeIds.HasProperty, "OutputArguments")
} }
};
var translateResponse = await session.TranslateBrowsePathsToNodeIdsAsync(translateRequest);
if (StatusCode.IsGood(translateResponse.Results[0].StatusCode) && translateResponse.Results[0].Targets.Count > 0)
{
var argNodeId = ExpandedNodeId.ToNodeId(translateResponse.Results[0].Targets[0].TargetId, session.NamespaceUris);
var readRequest = new ReadRequest {
NodesToRead = { new ReadValueId {
NodeId = argNodeId, AttributeId = Attributes.Value
} }
};
var readResponse = await session.ReadAsync(readRequest);
if (StatusCode.IsGood(readResponse.Results[0].StatusCode))
{
var value = readResponse.Results[0].GetValue <ExtensionObject[]>(null);
if (value != null)
{
inputArguments = (Argument[])ExtensionObject.ToArray(value, typeof(Argument));
}
}
}
if (StatusCode.IsGood(translateResponse.Results[1].StatusCode) && translateResponse.Results[1].Targets.Count > 0)
{
var argNodeId = ExpandedNodeId.ToNodeId(translateResponse.Results[1].Targets[0].TargetId, session.NamespaceUris);
var readRequest = new ReadRequest {
NodesToRead = { new ReadValueId {
NodeId = argNodeId, AttributeId = Attributes.Value
} }
};
var readResponse = await session.ReadAsync(readRequest);
if (StatusCode.IsGood(readResponse.Results[0].StatusCode))
{
var value = readResponse.Results[0].GetValue <ExtensionObject[]>(null);
if (value != null)
{
outputArguments = (Argument[])ExtensionObject.ToArray(value, typeof(Argument));
}
}
}
return(Tuple.Create(inputArguments, outputArguments));
}
