需求：自己写一套简单导航逻辑。1.导航路径由一个个节点组成，每个节点自定义可到达哪几个节点，根据这样一个网络写出一套算法实时获取最近节点，然后计算出所有可能到达终点的方案中最近的方案，最后返回出最近方案的数组，要求ID类型为string,用c#写

以下是一种简单的导航逻辑，实现了根据节点网络实时获取最近节点和计算最近方案的功能：

using System.Collections.Generic;

public class NavigationNode {
    public string ID { get; set; }
    public List<string> ReachableNodes { get; set; }

    public NavigationNode(string id, List<string> reachableNodes) {
        ID = id;
        ReachableNodes = reachableNodes;
    }
}

public class Navigation {
    private List<NavigationNode> nodes;

    public Navigation(List<NavigationNode> nodes) {
        this.nodes = nodes;
    }

    public string[] GetClosestPath(string startID, string endID) {
        // 实时获取最近节点
        Dictionary<string, int> distances = new Dictionary<string, int>();
        Dictionary<string, string> previousNodes = new Dictionary<string, string>();
        foreach (NavigationNode node in nodes) {
            distances[node.ID] = int.MaxValue;
        }
        distances[startID] = 0;
        Queue<string> queue = new Queue<string>();
        queue.Enqueue(startID);
        while (queue.Count > 0) {
            string currentID = queue.Dequeue();
            foreach (string neighborID in nodes.Find(n => n.ID == currentID).ReachableNodes) {
                int distance = distances[currentID] + 1;
                if (distance < distances[neighborID]) {
                    distances[neighborID] = distance;
                    previousNodes[neighborID] = currentID;
                    queue.Enqueue(neighborID);
                }
            }
        }

        // 计算所有可能到达终点的方案中最近的方案
        List<string> path = new List<string>();
        string current = endID;
        while (previousNodes.ContainsKey(current)) {
            path.Add(current);
            current = previousNodes[current];
        }
        path.Add(startID);
        path.Reverse();
        return path.ToArray();
    }
}

使用示例：

List<NavigationNode> nodes = new List<NavigationNode>();
nodes.Add(new NavigationNode("A", new List<string>{"B", "C"}));
nodes.Add(new NavigationNode("B", new List<string>{"A", "C", "D"}));
nodes.Add(new NavigationNode("C", new List<string>{"A", "B", "D"}));
nodes.Add(new NavigationNode("D", new List<string>{"B", "C"}));
Navigation navigation = new Navigation(nodes);
string[] path = navigation.GetClosestPath("A", "D");
foreach (string nodeID in path) {
    Console.WriteLine(nodeID);
}