AE+C#最短路径分析

在ArcGIS Engine开发环境中，使用C#语言进行最短路径分析，可以按照以下步骤进行：

1. 创建一个新的ArcGIS Engine工程。
2. 添加需要进行最短路径分析的地图数据和网络数据集。
3. 在Visual Studio中创建一个新的Windows Form应用程序。
4. 在Form窗口中添加地图控件，用于显示地图数据。
5. 在代码中创建一个NetworkAnalyst对象，并设置其参数，包括起点、终点、分析方式等。
6. 调用NetworkAnalyst对象的Solve方法进行最短路径分析。
7. 获取分析结果，包括最短路径、路径长度、路径节点等，并在地图上绘制最短路径。
8. 编译和运行程序，测试最短路径分析的功能。

下面是一个示例代码，用于进行最短路径分析：

using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.NetworkAnalyst;
using ESRI.ArcGIS.SystemUI;

namespace shortestPath
{
    public partial class Form1 : Form
    {
        private IMap m_map = null;
        private IEngineNetworkAnalystEnvironment m_naEnv = null;
        private INetworkDataset m_networkDataset = null;
        private IEngineNetworkAnalyst m_naSolver = null;
        private INALayer m_naLayer = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //获取MapControl控件的IMap对象
            m_map = axMapControl1.Map;

            //创建EngineNetworkAnalystEnvironment对象
            m_naEnv = new EngineNetworkAnalystEnvironmentClass();

            //加载NetworkDataset
            string ndsPath = @"C:\data\network\MyNetworkDataset.nds";
            m_networkDataset = m_naEnv.CreateNetworkDataset(ndsPath);

            //创建EngineNetworkAnalyst对象
            m_naSolver = new EngineNetworkAnalystClass();
            m_naSolver.NetworkDataset = m_networkDataset;

            //设置分析参数
            INALayer naLayer = m_naSolver.Context.Layer;
            INetworkSource networkSource = m_networkDataset.NetworkSources.get_Item(0);
            INetworkDataset networkDataset = networkSource as INetworkDataset;
            IPoint fromPoint = new PointClass();
            fromPoint.X = 100;
            fromPoint.Y = 200;
            IPoint toPoint = new PointClass();
            toPoint.X = 300;
            toPoint.Y = 400;
            INetworkElement fromElement;
            INetworkElement toElement;
            networkDataset.BuildNetwork(out fromElement, out toElement);
            INetworkElementBarriers fromBarriers = new NetworkElementBarriersClass();
            INetworkElementBarriers toBarriers = new NetworkElementBarriersClass();
            INetworkAttribute2 lengthAttribute = networkDataset.get_AttributeByName("Length") as INetworkAttribute2;
            m_naSolver.Context.OutSpatialReference = m_map.SpatialReference;
            m_naSolver.Context.DirectionsLengthUnit = esriNetworkAttributeUnits.esriNAUMiles;
            m_naSolver.Context.UseHierarchy = false;
            m_naSolver.Context.FindBestOrder = true;
            m_naSolver.Context.PreserveFirstStop = true;
            m_naSolver.Context.PreserveLastStop = true;
            m_naSolver.Context.UseTimeWindows = false;
            m_naSolver.Context.UseStartTime = false;
            m_naSolver.Context.UseHierarchy = true;
            m_naSolver.Context.HierarchyWeight = 0.7;
            m_naSolver.Context.TravelDirection = esriNetworkTravelDirection.esriNTDAgainstFlow;
            m_naSolver.Context.ImpedanceAttributeName = lengthAttribute.Name;
            m_naSolver.Context.FromPoint = fromPoint;
            m_naSolver.Context.ToPoint = toPoint;
            m_naSolver.Context.FromElement = fromElement;
            m_naSolver.Context.ToElement = toElement;
            m_naSolver.Context.FromPointBarrierElements = fromBarriers;
            m_naSolver.Context.ToPointBarrierElements = toBarriers;

            //解决最短路径问题
            m_naSolver.Solve(m_naSolver.Context, ref naLayer, null);

            //获取分析结果
            m_naLayer = naLayer as INALayer;
            IRouteResult routeResult = m_naLayer.Context.Result as IRouteResult;
            IGeometry geometry = routeResult.Route.ShapeCopy;
            double length = geometry.Length;

            //在地图上绘制最短路径
            IFeatureLayer featureLayer = m_naLayer as IFeatureLayer;
            IFeatureClass featureClass = featureLayer.FeatureClass;
            IFeature feature = featureClass.GetFeature(0);
            IFeatureSelection featureSelection = featureLayer as IFeatureSelection;
            featureSelection.Clear();
            featureSelection.Add(feature);

            //刷新地图
            axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewAll, null, null);
        }
    }
}

希望这个示例代码能够对你有所帮助！