Is there any way to keep the nodes connected and not disconnect when dragging?

[Ptkatz]

I don't want the connected nodes to disconnect，I used this method, but it still disconnects when dragging the port.

node2Input.Port.ConnectionDragStarted.Subscribe(s =>
{ node2Input.Port.OnPortEnter(); });

[FabianNitsche]

You can derive from NodeInputViewModel and overwrite the CreatePendingConnection() and do something like

if (MaxConnections == 1 && Connections.Items.Any())
    return;
base.CreatePendingConnection();

[Ptkatz]

You can derive from NodeInputViewModel and overwrite the CreatePendingConnection() and do something like

if (MaxConnections == 1 && Connections.Items.Any())
    return;
base.CreatePendingConnection();

ok, thank you very much.

I have another question, how to make the connecting line of two nodes have an arrow.