使用Quickgraph进行公用网络跟踪

我计划将quickgraph用于带有源接收器节点的公用设施网络定向图，其中包含一些概念：

Tracing Upstream: tracing all the edges whose flow directions are towards the node under the flow direction with one node as the beginning to upstream.

Tracing Downstream: tracing all the edges whose flow directions are towards the node under the flow direction with one node as the beginning to downstream.

Source: it is a node at the head of upstream, like valve in water net.

Sink: it is a node at the bottom of downstream, like the outlet in water supplying network.

Barrie: it is a stop node, like outage on pile in water net

Disable node: it is a stop node like closer with open status in electric net    

所以在Quickgraph中

- is there algorithm for Tracing Upstream, Tracing Downstream?

- is there concept barrie, disable node?

提前谢谢