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ArcGIS Runtime SDK for .NET

Service feature table (on interaction cache)

This code sample is available for these platforms:
View Sample on GitHub

Display a feature layer from a service using the on interaction cache feature request mode.

screenshot

Use case

ServiceFeatureTable supports three request modes, which define how features are requested from the service and stored in the local table. The feature request modes have different performance characteristics. Use On interaction cache in scenarios with large amounts of infrequently edited data. See Table performance concepts to learn more.

How it works

  1. Set the ServiceFeatureTable.FeatureRequestMode property of the service feature table to ON_INTERACTION_CACHE before the table is loaded.
  2. Add the table to the map using a FeatureLayer; features will be requested for the visible extent as the user pans and zooms.

Relevant API

  • FeatureLayer
  • FeatureRequestMode.OnInteractionCache
  • ServiceFeatureTable
  • ServiceFeatureTable.FeatureRequestMode

About the data

The U.S. National Bridge Inventory describes 600,000 bridges in the United States. The sample uses a modified copy of the inventory hosted in ArcGIS Online. The sample opens with an initial visible extent centered over Bridgeport, CT.

Additional information

On interaction cache is the default feature request mode. Features are requested automatically for the visible extent as the users pans and zooms the map. If the user returns to an area where features have previously been requested, those features won't be requested again.

Tags

cache, feature request mode, performance

Sample Code

<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.ServiceFeatureTableCache.ServiceFeatureTableCache"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">

    <Grid>
        <esriUI:MapView x:Name="MyMapView"/>
    </Grid>
</UserControl>
// Copyright 2016 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific 
// language governing permissions and limitations under the License.

using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using System;

namespace ArcGISRuntime.UWP.Samples.ServiceFeatureTableCache
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Service feature table (cache)",
        "Data",
        "This sample demonstrates how to use a feature service in on interaction cache mode.",
        "")]
    public sealed partial class ServiceFeatureTableCache 
    {
        public ServiceFeatureTableCache()
        {
            InitializeComponent();

            // Create the UI, setup the control references and execute initialization 
            Initialize();
        }

        private 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);
            myMap.InitialViewpoint = new Viewpoint(initialLocation);

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

            // Create feature table for the pools feature service
            ServiceFeatureTable poolsFeatureTable = new ServiceFeatureTable(serviceUri)
            {

                // Define the request mode
                FeatureRequestMode = FeatureRequestMode.OnInteractionCache
            };

            // Create FeatureLayer that uses the created table
            FeatureLayer poolsFeatureLayer = new FeatureLayer(poolsFeatureTable);

            // Add created layer to the map
            myMap.OperationalLayers.Add(poolsFeatureLayer);

            // Assign the map to the MapView
            MyMapView.Map = myMap;
        }
    }
}