C# FeatureLayer.LoadAsync方法代码示例

        private async void Initialize()
        {
            // Create new Map with basemap
            Map myMap = new Map(BasemapType.Topographic, 34.056, -117.196, 4);

            // Create uri to the used feature service
            var serviceUri = new Uri(
                "http://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0");

            // Initialize a new feature layer
            ServiceFeatureTable myFeatureTable = new ServiceFeatureTable(serviceUri);
            FeatureLayer myFeatureLayer = new FeatureLayer(myFeatureTable);

            // Make sure that the feature layer gets loaded
            await myFeatureLayer.LoadAsync();

            // Add the feature layer to the Map
            myMap.OperationalLayers.Add(myFeatureLayer);

            // Provide used Map to the MapView
            _myMapView.Map = myMap;

            // Hook up the DrawStatusChanged event
            _myMapView.DrawStatusChanged += OnMapViewDrawStatusChanged;

            // Animate the activity spinner
            _activityIndicator.StartAnimating();
        }

        private async void Initialize()
        {
            // Create new Map with basemap
            Map myMap = new Map(Basemap.CreateTopographic());

            // Create a mappoint the map should zoom to
            MapPoint mapPoint = new MapPoint(-13630484, 4545415, SpatialReferences.WebMercator);

            // Set the initial viewpoint for map
            myMap.InitialViewpoint = new Viewpoint(mapPoint, 90000);

            // Provide used Map to the MapView
            _myMapView.Map = myMap;

            // Create the uri for the feature service
            Uri featureServiceUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/SF311/FeatureServer/0");

            // Initialize feature table using a url to feature server url
            ServiceFeatureTable featureTable = new ServiceFeatureTable(featureServiceUri);

            // Initialize a new feature layer based on the feature table
            _featureLayer = new FeatureLayer(featureTable);

            // Load the layer
            await _featureLayer.LoadAsync();

            // Check for the load status. If the layer is loaded then add it to map
            if (_featureLayer.LoadStatus == Esri.ArcGISRuntime.LoadStatus.Loaded)
            {
                //Add the feature layer to the map
                myMap.OperationalLayers.Add(_featureLayer);
            }
        }

        private async void Initialize()
        {
            // Create new Map with basemap
            var myMap = new Map(Basemap.CreateTopographic());

            // Create envelope to be used as a target extent for map's initial viewpoint
            Envelope myEnvelope = new Envelope(
                -1131596.019761, 3893114.069099, 3926705.982140, 7977912.461790,
                SpatialReferences.WebMercator);

            // Set the initial viewpoint for map
            myMap.InitialViewpoint = new Viewpoint(myEnvelope);

            // Provide used Map to the MapView
            _myMapView.Map = myMap;

            // Create Uri for the feature service
            Uri featureServiceUri = new Uri(
                "http://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0");

            // Initialize feature table using a url to feature server url
            var featureTable = new ServiceFeatureTable(featureServiceUri);

            // Initialize a new feature layer based on the feature table
            _featureLayer = new FeatureLayer(featureTable);

            // Set the selection color for feature layer
            _featureLayer.SelectionColor = Color.Cyan;

            // Set the selection width
            _featureLayer.SelectionWidth = 3;

            // Make sure that used feature layer is loaded before we hook into the tapped event
            // This prevents us trying to do selection on the layer that isn't initialized
            await _featureLayer.LoadAsync();

            // Check for the load status. If the layer is loaded then add it to map
            if (_featureLayer.LoadStatus == Esri.ArcGISRuntime.LoadStatus.Loaded)
            {
                // Add the feature layer to the map
                myMap.OperationalLayers.Add(_featureLayer);

                // Add tap event handler for mapview
                _myMapView.GeoViewTapped += OnMapViewTapped;
            }
        }

        private async void Initialize()
        {
            // Create new Map with basemap
            Map myMap = new Map(Basemap.CreateTopographic());

            // Create and set initial map area
            Envelope initialLocation = new Envelope(
                -1.30758164047166E7, 4014771.46954516, -1.30730056797177E7, 4016869.78617381,
                SpatialReferences.WebMercator);

            // Set the initial viewpoint for map
            myMap.InitialViewpoint = new Viewpoint(initialLocation);

            // Provide used Map to the MapView
            _myMapView.Map = myMap;

            // Create uri to the used feature service
            var serviceUri = new Uri(
               "http://sampleserver6.arcgisonline.com/arcgis/rest/services/PoolPermits/FeatureServer/0");

            // Initialize feature table using a url to feature server url
            ServiceFeatureTable featureTable = new ServiceFeatureTable(serviceUri);

            // Initialize a new feature layer based on the feature table
            _featureLayer = new FeatureLayer(featureTable);

            // Make sure that the feature layer gets loaded
            await _featureLayer.LoadAsync();

            // Check for the load status. If the layer is loaded then add it to map
            if (_featureLayer.LoadStatus == Esri.ArcGISRuntime.LoadStatus.Loaded)
            {
                // Add the feature layer to the map
                myMap.OperationalLayers.Add(_featureLayer);
            }
        }