ArcGIS Runtime SDK for WPF之测量距离和面积

bu不多说，上代码

using System.Windows;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Tasks;
using ESRI.ArcGIS.Client.Local;
using System;
using System.Windows.Input;
using ESRI.ArcGIS.Client.Geometry;
using ESRI.ArcGIS.Client.Symbols;
using System.Collections.Generic;

namespace ArcGISWpfApplication2
{

    public partial class MainWindow : Window
    {
        GeometryService gMeasureLength,gMeasureArea;
        Draw drawMeasure;
        public MainWindow()
        {
            // License setting and ArcGIS Runtime initialization is done in Application.xaml.cs.

            InitializeComponent();
            GraphicsLayer gLayer = new GraphicsLayer();
            gLayer.ID = "MyGraphicsLayerMeasure";
            Map.Layers.Add(gLayer);
            //Map.Layers.Insert(0, gLayer);//这样不行，arcgis runtime加载图层与arcgis mapinfo方式相反，索引大的在上面
            LocalGeometryServiceInit();
        }

        void LocalGeometryServiceInit()
        {
            LocalGeometryService.GetServiceAsync(localGeometryService =>
                {
                    gMeasureLength = new GeometryService();
                    gMeasureLength.Url = localGeometryService.UrlGeometryService;
                    gMeasureLength.LengthsCompleted += gMeasureLength_LengthsCompleted;
                    gMeasureLength.Failed += gMeasureLength_Failed;
                });

            LocalGeometryService.GetServiceAsync(localGeometryService =>
            {
                gMeasureArea = new GeometryService();
                gMeasureArea.Url = localGeometryService.UrlGeometryService;
                gMeasureArea.AreasAndLengthsCompleted += gMeasureArea_AreasAndLengthsCompleted;
                gMeasureArea.Failed += gMeasureLength_Failed;
            });
        }

        void gMeasureArea_AreasAndLengthsCompleted(object sender, AreasAndLengthsEventArgs e)
        {
            double _Lengths = e.Results.Lengths[];
            double _Area = e.Results.Areas[];
            MessageBox.Show(String.Format("多边形周长为{0}，面积为{1}",Math.Round(_Lengths,),Math.Round(_Area,)));
        }

        void gMeasureLength_Failed(object sender, TaskFailedEventArgs e)
        {
            MessageBox.Show("测量失败");
        }

        void gMeasureLength_LengthsCompleted(object sender, LengthsEventArgs e)
        {
            MessageBox.Show(String.Format("折线的长度：{0} 公里", Math.Round(e.Results[], )));
            Map.Cursor = Cursors.Hand;
        }

        private void MeasureLine(object sender, RoutedEventArgs e)
        {
            GraphicsLayer _GraphicsLayer = Map.Layers["MyGraphicsLayerMeasure"] as GraphicsLayer;
            _GraphicsLayer.ClearGraphics();
            drawMeasure = new Draw(Map)
            {
                DrawMode = DrawMode.Polyline,
                IsEnabled = true,
                //LineSymbol = Root.Resources["SelectLineSymbol"] as LineSymbol
            };

            drawMeasure.DrawBegin +=drawMeasure_DrawBegin;
            drawMeasure.DrawComplete +=drawMeasure_DrawDistanceComplete;
        }

        void drawMeasure_DrawDistanceComplete(object sender, DrawEventArgs e)
        {
             Polyline _Polyline = e.Geometry as Polyline;
            _Polyline.SpatialReference = Map.SpatialReference;
              Graphic _Graphic = new Graphic()
            {
                Symbol = Resources["CompleteLineSymbol"] as Symbol,//不自定义的话默认的是透明的，不然测量完看不到线
                Geometry = _Polyline
            };

            GraphicsLayer _GraphicsLayer = Map.Layers["MyGraphicsLayerMeasure"] as GraphicsLayer;
            _GraphicsLayer.Graphics.Add(_Graphic);

            //开始计算长度
            gMeasureLength.LengthsAsync(_GraphicsLayer.Graphics, LinearUnit.Kilometer, CalculationType.Geodesic, null);
            drawMeasure.DrawMode = DrawMode.None;

        }

        void drawMeasure_DrawBegin(object sender, EventArgs e)
        {
             Map.Cursor=Cursors.Arrow;
        }
        //MeasureAreaLength
        private void MeasureAreaLength(object sender, RoutedEventArgs e)
        {
            GraphicsLayer _GraphicsLayer = Map.Layers["MyGraphicsLayerMeasure"] as GraphicsLayer;
            _GraphicsLayer.ClearGraphics();
            drawMeasure = new Draw(Map)
            {
                DrawMode = DrawMode.Polygon,
                IsEnabled = true,
                //LineSymbol = Root.Resources["SelectLineSymbol"] as LineSymbol
            };

            drawMeasure.DrawBegin += drawMeasure_DrawBegin;
            drawMeasure.DrawComplete += drawMeasure_DrawAreaLengthComplete;
        }

        private void drawMeasure_DrawAreaLengthComplete(object sender, DrawEventArgs e)
        {
            Polygon _Polygon = e.Geometry as Polygon;
            _Polygon.SpatialReference = Map.SpatialReference;
            Graphic _Graphic = new Graphic() {
                Symbol = Resources["CompletePolygonSymbol"] as Symbol,
                Geometry = _Polygon
            };
            GraphicsLayer _GraphicsLayer = Map.Layers["MyGraphicsLayerMeasure"] as GraphicsLayer;
            _GraphicsLayer.Graphics.Add(_Graphic);
            List<Graphic> _GraphicList = new List<Graphic>();
            _GraphicList.Add(_Graphic);
            gMeasureArea.AreasAndLengthsAsync(_GraphicList,AreaUnit.SquareKilometers);
        }

            }
        }

<Window x:Class="ArcGISWpfApplication2.MainWindow"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:esri="http://schemas.esri.com/arcgis/client/2009"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <esri:SimpleLineSymbol x:Key="CompleteLineSymbol" Color="Green" Width="4" />
        <esri:SimpleFillSymbol x:Key="CompletePolygonSymbol" Fill="Green" BorderBrush="LightBlue" BorderThickness="1" />
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <Border Background="#ccc">
            <StackPanel Orientation="Horizontal">
                <Button Height="30" Width="100" Click="MeasureLine">测距</Button>
                <Button Height="30" Width="100" Click="MeasureAreaLength">测面积</Button>
            </StackPanel>
        </Border>
        <esri:Map x:Name="Map" Grid.Row="1" Background="White" Cursor="Hand" Extent="-20014711, 15, 1656956, 12175318">
            <esri:ArcGISTiledMapServiceLayer ID="BaseLayer" Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />
            <!--<esri:GpsLayer x:Name="MyGpsLayer" />-->
        </esri:Map>
    </Grid>
</Window>