WebGIS中最近设施分析：实现后台源代码示例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Geometry;
using ESRI.ArcGIS.Client.Tasks;

namespace ArcGISSilverlightSDK
{
    public partial class ClosestFacility : UserControl
    {
        private RouteTask myRouteTask;
        private GraphicsLayer facilitiesGraphicsLayer;
        private GraphicsLayer IncidentsGraphicsLayer;
        private GraphicsLayer barriersGraphicsLayer;
        private GraphicsLayer routeGraphicsLayer;
        List<Graphic> pointBarriers;
        List<Graphic> polylineBarriers;
        List<Graphic> polygonBarriers;
        Random random;

        public ClosestFacility()
        {
            InitializeComponent();

            facilitiesGraphicsLayer = MyMap.Layers["MyFacilitiesGraphicsLayer"] as GraphicsLayer;
            IncidentsGraphicsLayer = MyMap.Layers["MyIncidentsGraphicsLayer"] as GraphicsLayer;
            barriersGraphicsLayer = MyMap.Layers["MyBarriersGraphicsLayer"] as GraphicsLayer;

            routeGraphicsLayer = MyMap.Layers["MyRoutesGraphicsLayer"] as GraphicsLayer;

            myRouteTask = new RouteTask("http://sampleserver6.arcgisonline.com/arcgis/rest/services/NetworkAnalysis/SanDiego/NAServer/ClosestFacility");
            myRouteTask.SolveClosestFacilityCompleted += SolveClosestFacility_Completed;
            myRouteTask.Failed += SolveClosestFacility_Failed;

            pointBarriers = new List<Graphic>();
            polylineBarriers = new List<Graphic>();
            polygonBarriers = new List<Graphic>();

            random = new Random();
        }

        private void SolveButton_Click(object sender, RoutedEventArgs e)
        {
            List<AttributeParameter> aps = new List<AttributeParameter>();
            AttributeParameter ap = GetAttributeParameterValue (AttributeParameter2.SelectionBoxItem.ToString().Trim());
            if (ap != null)
                aps.Add( ap );

            GenerateBarriers();

            RouteClosestFacilityParameters routeParams = new RouteClosestFacilityParameters()
            {
                Incidents = IncidentsGraphicsLayer.Graphics,
                Barriers = pointBarriers.Count > 0 ? pointBarriers : null,
                PolylineBarriers = polylineBarriers.Count > 0 ? polylineBarriers : null,
                PolygonBarriers = polygonBarriers.Count > 0 ? polygonBarriers : null,
                Facilities = facilitiesGraphicsLayer.Graphics,