public BFS(string xmlPath, int start)
{
//检查start起点
if (start < 0)
{
Console.WriteLine("start不可以为负数");
return;
}
//根据XML文件生成图（MyGraph即默认构造的图）
MyGraph graph = new MyGraph(xmlPath);
//再次检查图的数据
if (start > graph.GetVerticesCount() ||
graph.GetVerticesCount() == 0 ||
graph.GetEdgeCount() == 0)
{
return;
}
this.start = start;
this.marked = new bool[graph.GetVerticesCount()];
this.from = new int[graph.GetVerticesCount()];
//起点自身和自身连通
this.marked[start] = true;
//初始值的from[]全部设置为-1，即标记未找到最近的上一个顶点
for (int i = 0; i < graph.GetVerticesCount(); i++)
{
this.from[i] = -1;
}
//绑定图中与start连通的marked[]和from[]
BondingConnect_bfs(graph);
//起点的from[start]即自身(先绑定其他最后再绑定自身)
this.from[start] = start;
}