I am trying to create a point graphic using a map point and a marker symbol.

A map point is defined with x and y coordinates and a spatial reference.

For latitude and longitude coordinates, the spatial reference is WGS84.

I am using following code to achieve this

using System;
using System.Collections.Generic;
using System.Text;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using System.ComponentModel;
using System.Runtime.CompilerServices;

using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;

namespace AddPointLineAndPolygon
{
    class MapViewModel : INotifyPropertyChanged
    {

        public MapViewModel()
        {
            SetupMap();

            CreateGraphics();

        }

        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        private Map _map;
        public Map Map
        {
            get { return _map; }
            set
            {
                _map = value;
                OnPropertyChanged();
            }
        }

        private GraphicsOverlayCollection _graphicsOverlays;
        public GraphicsOverlayCollection GraphicsOverlays
        {
            get { return _graphicsOverlays; }
            set
            {
                _graphicsOverlays = value;
                OnPropertyChanged();
            }
        }

        private void SetupMap()
        {
            // Create a new map with a 'topographic vector' basemap.
            this.Map = new Map(BasemapStyle.ArcGISTopographic);
        }

        private void CreateGraphics()
        {
            // Create a new graphics overlay to contain a variety of graphics.
            var malibuGraphicsOverlay = new GraphicsOverlay();

            // Add the overlay to a graphics overlay collection.
            GraphicsOverlayCollection overlays = new GraphicsOverlayCollection
            {
                malibuGraphicsOverlay
            };

            // Set the view model's "GraphicsOverlays" property (will be consumed by the map view).
            this.GraphicsOverlays = overlays;

            // Create a point geometry.
            var dumeBeachPoint = new MapPoint(-118.8066, 34.0006, SpatialReferences.Wgs84);

            // Create a symbol to define how the point is displayed.
            var pointSymbol = new SimpleMarkerSymbol
            {
                Style = SimpleMarkerSymbolStyle.Circle,
                Color = System.Drawing.Color.Orange,
                Size = 10.0
            };

            // Add an outline to the symbol.
            pointSymbol.Outline = new SimpleLineSymbol
            {
                Style = SimpleLineSymbolStyle.Solid,
                Color = System.Drawing.Color.Blue,
                Width = 2.0
            };

But when I run this code, it is not showing any graphics. What is missing in my code, please help.

CodePudding user response：

You can create a Graphic with the point and pointSymbol and display the Graphic by adding it to the graphicsOverlay's Graphics collection.

See the following code:

  // Create a point graphic with the geometry and symbol.
    var pointGraphic = new Graphic(dumeBeachPoint, pointSymbol);

    // Add the point graphic to graphics overlay.
    malibuGraphicsOverlay.Graphics.Add(pointGraphic);