Add graphics to a map view

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// Add the graphic overlay to the geo view's graphics overlay collection.
MainView.GraphicsOverlays.Add(graphicsOverlay);

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// Get the points-of-interest graphics overlay using its ID.
var poiGraphicsOverlay = MainView.GraphicsOverlays["PointsOfInterestGraphics"];

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// Create a new graphics overlay.
var graphicsOverlay = new GraphicsOverlay
{
    Id = "PointsOfInterestGraphics"
};

// Create a new map point to define the graphic location.
var pierPoint = new MapPoint(-118.4978, 34.0086, SpatialReferences.Wgs84);

// Create a new symbol for the graphic.
var redCircleSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, System.Drawing.Color.Red, 20);

// Create a new graphic.
var santaMonicaPierGraphic = new Graphic(pierPoint, redCircleSymbol);

// Add attribute values (if needed).
santaMonicaPierGraphic.Attributes.Add("Name", "Santa Monica Pier");
santaMonicaPierGraphic.Attributes.Add("type", "pier");

// Add the graphic to the graphics overlay's graphics collection.
graphicsOverlay.Graphics.Add(santaMonicaPierGraphic);

// Add the graphic overlay to the geo view's graphics overlay collection.
MainView.GraphicsOverlays.Add(graphicsOverlay);

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// Create a point to define text location (anchor point).
var labelPoint = new MapPoint(-118.4978, 34.0086, 500, SpatialReferences.Wgs84);

// Create a text symbol to define the text, color, size, angle, alignment, and offsets.
var textSymbol = new TextSymbol
{
    Text = "Santa Monica Pier",
    Angle = -45,
    Color = System.Drawing.Color.Red,
    HaloColor = System.Drawing.Color.White,
    Size = 20,
    VerticalAlignment = Esri.ArcGISRuntime.Symbology.VerticalAlignment.Bottom,
    OffsetX = -40,
    OffsetY = 15
};

// Create a graphic with the geometry and symbol.
var labelGraphic = new Graphic(labelPoint, textSymbol);

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MainView.GeoViewTapped += async (s, e) =>
{
    // Get the points of interest graphics overlay.
    var pointsOfInterestOverlay = MainView.GraphicsOverlays["PointsOfInterestGraphics"];
    if (pointsOfInterestOverlay == null) { return; }

    // Identify graphics in the points-of-interest overlay using the screen tap.
    var screenPoint = e.Position;
    var resultGraphics = await MainView.IdentifyGraphicsOverlayAsync(pointsOfInterestOverlay, screenPoint, 10, false);

    // Show name attribute value in a callout for the first graphic identified (if any).
    if (resultGraphics != null && resultGraphics.Graphics.Count > 0)
    {
        var poiGraphic = resultGraphics.Graphics.FirstOrDefault();
        var callout = new CalloutDefinition(poiGraphic)
        {
            Text = "Point of Interest",
            DetailText = poiGraphic.Attributes["name"].ToString()
        };
        // Assuming that all POI graphics are points.
        MapPoint calloutAnchor = poiGraphic.Geometry as MapPoint;
        MainView.ShowCalloutAt(calloutAnchor, callout);
    }
};

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// Get all graphics with a "type" attribute of "pier".
var pierGraphics = poiGraphicsOverlay.Graphics
.Where(g => g.Attributes["type"].ToString() == "pier");

// Select them all.
foreach (var g in pierGraphics)
{
    g.IsSelected = true;
}

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// Get the current location (point) of the graphic.
var currentPosition = boatGraphic.Geometry as MapPoint;

// Define new x and y coordinates by applying an offset.
var newX = currentPosition.X + deltaX;
var newY = currentPosition.Y + deltaY;

// Update the point with the new coordinates (graphic will update to show new location).
var updatedPosition = new MapPoint(newX, newY);
boatGraphic.Geometry = updatedPosition;