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UniqueValue Class

Represents a unique value or combination of values and a matching symbol in a UniqueValueRenderer.
Inheritance Hierarchy
SystemObject
  Esri.ArcGISRuntime.SymbologyUniqueValue

Namespace:  Esri.ArcGISRuntime.Symbology
Assembly:  Esri.ArcGISRuntime (in Esri.ArcGISRuntime.dll) Version: 100.11.0
Syntax
public sealed class UniqueValue : INotifyPropertyChanged

The UniqueValue type exposes the following members.

Constructors
Properties
  NameDescription
Public propertyDescription
Gets or sets a description of the unique value. "Parcels zoned for residential use", for example.
Public propertyLabel
Gets or sets a label for the unique value. "Residential", for example.
Public propertySymbol
Symbol used to represent the value or values
Public propertyValues
Gets a collection that defines a unique value or unique combination of values. Multiple values represent a unique combination. The FieldNames property must have a matching number of entries. There are limitations on the types of values that can be stored. Types that can be stored are String, Guid, DateTime, DateTimeOffset, Boolean, Single, Double, and most integral types (signed and unsigned Int16, Int32, and Int64).
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Methods
  NameDescription
Public methodClone
Returns a clone of this UniqueValue.
Public methodStatic memberFromJson
Creates an instance of a UniqueValue by deserializing JSON.
Public methodToJson
Returns a string containing the JSON representation of the UniqueValue.
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Events
  NameDescription
Public eventPropertyChanged
Occurs when a property value changes.
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Examples

WPF

Example Name: RenderUniqueValues

Render features in a layer using a distinct symbol for each unique attribute value.

Code example screen shot.

C#
// 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.Mapping;
using Esri.ArcGISRuntime.Symbology;
using System;
using System.Drawing;

namespace ArcGISRuntime.WPF.Samples.RenderUniqueValues
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Unique value renderer",
        category: "Symbology",
        description: "Render features in a layer using a distinct symbol for each unique attribute value.",
        instructions: "The map with the symbolized feature layer will be shown automatically when the sample loads.",
        tags: new[] { "draw", "renderer", "symbol", "symbology", "values" })]
    public partial class RenderUniqueValues
    {
        public RenderUniqueValues()
        {
            InitializeComponent();

            // Initialize the sample.
            Initialize();
        }

        private void Initialize()
        {
            // Create new Map with basemap.
            Map myMap = new Map(BasemapStyle.ArcGISTopographic);

            // Create URL to the census feature service.
            Uri serviceUri = new Uri(
                "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3");

            // Create service feature table.
            ServiceFeatureTable statesFeatureTable = new ServiceFeatureTable(serviceUri);

            // Create a new feature layer using the service feature table.
            FeatureLayer statesLayer = new FeatureLayer(statesFeatureTable);

            // Create a new unique value renderer.
            UniqueValueRenderer regionRenderer = new UniqueValueRenderer();

            // Add the "SUB_REGION" field to the renderer.
            regionRenderer.FieldNames.Add("SUB_REGION");

            // Define a line symbol to use for the region fill symbols.
            SimpleLineSymbol stateOutlineSymbol = new SimpleLineSymbol(
                SimpleLineSymbolStyle.Solid, Color.White, 0.7);

            // Define distinct fill symbols for a few regions (use the same outline symbol).
            SimpleFillSymbol pacificFillSymbol = new SimpleFillSymbol(
                SimpleFillSymbolStyle.Solid, Color.Blue, stateOutlineSymbol);
            SimpleFillSymbol mountainFillSymbol = new SimpleFillSymbol(
                SimpleFillSymbolStyle.Solid, Color.LawnGreen, stateOutlineSymbol);
            SimpleFillSymbol westSouthCentralFillSymbol = new SimpleFillSymbol(
                SimpleFillSymbolStyle.Solid, Color.SandyBrown, stateOutlineSymbol);

            // Add values to the renderer: define the label, description, symbol, and attribute value for each.
            regionRenderer.UniqueValues.Add(
                new UniqueValue("Pacific", "Pacific Region", pacificFillSymbol, "Pacific"));
            regionRenderer.UniqueValues.Add(
                new UniqueValue("Mountain", "Rocky Mountain Region", mountainFillSymbol, "Mountain"));
            regionRenderer.UniqueValues.Add(
                new UniqueValue("West South Central", "West South Central Region", westSouthCentralFillSymbol, "West South Central"));

            // Set the default region fill symbol for regions not explicitly defined in the renderer.
            SimpleFillSymbol defaultFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Cross, Color.Gray, null);
            regionRenderer.DefaultSymbol = defaultFillSymbol;
            regionRenderer.DefaultLabel = "Other";

            // Apply the unique value renderer to the states layer.
            statesLayer.Renderer = regionRenderer;

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

            // Assign the map to the MapView.
            MyMapView.Map = myMap;
        }
    }
}
XAML
<UserControl x:Class="ArcGISRuntime.WPF.Samples.RenderUniqueValues.RenderUniqueValues"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:esri="http://schemas.esri.com/arcgis/runtime/2013" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <esri:MapView x:Name="MyMapView"/>
    </Grid>
</UserControl>
See Also
Additional Examples
Hyperlink to ExampleDescription
DisplayUtilityAssociationsCreate graphics for utility associations in a utility network.
RenderUniqueValuesRender features in a layer using a distinct symbol for each unique attribute value.
TraceUtilityNetworkDiscover connected features in a utility network using connected, subnetwork, upstream, and downstream traces.