Work with trace results

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var traceResults = await utilityNetwork.TraceAsync(traceParameters);

foreach (var result in traceResults)
{
    if (result.Warnings.Count > 0)
        Debug.WriteLine($"Trace Result Warnings:\n\t{string.Join("\n", result.Warnings)}");

    if (result.NearestNeighborResult != UtilityNearestNeighborResult.NotApplicable)
        Debug.WriteLine($"Nearest Neighbor: {result.NearestNeighborResult}");
}

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if (traceResult is UtilityElementTraceResult elementResult)
{
    foreach (var layer in MainMapView.Map.OperationalLayers.OfType<FeatureLayer>())
    {
        var elements = elementResult.Elements.Where(el => el.NetworkSource.FeatureTable == layer.FeatureTable);
        if (!elements.Any())
            continue;

        var features = await utilityNetwork.GetFeaturesForElementsAsync(elements);
        if (!features.Any())
            continue;

        layer.SelectFeatures(features);
    }
}

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if (traceResult is UtilityFunctionTraceResult functionResult)
{
    foreach (var functionOutput in functionResult.FunctionOutputs)
    {
        Debug.WriteLine($"{functionOutput.Function.FunctionType} on " +
            $"'{functionOutput.Function.NetworkAttribute.Name}':\n\t" +
            $"{functionOutput.Result}");
    }
}

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        private static string GetExpression(UtilityTraceCondition? expression)
{
    if (expression is null)
        return string.Empty;

    if (expression is UtilityCategoryComparison categoryComparison)
        return $"`{categoryComparison.Category.Name}` {categoryComparison.ComparisonOperator}";

    if (expression is UtilityNetworkAttributeComparison attributeComparison)
    {
        var value = GetValue(attributeComparison.NetworkAttribute.DataType, attributeComparison.Value);
        if (attributeComparison.NetworkAttribute.Domain is CodedValueDomain codedValueDomain)
            value = codedValueDomain.CodedValues.FirstOrDefault(c => value?.Equals(GetValue(attributeComparison.NetworkAttribute.DataType, c.Code)) == true)?.Name;
        return $"`{attributeComparison.NetworkAttribute.Name}` {attributeComparison.ComparisonOperator}  {value}";
    }

    if (expression is UtilityTraceAndCondition andCondition)
        return $"({GetExpression(andCondition.LeftExpression)} AND {GetExpression(andCondition.RightExpression)})";

    if (expression is UtilityTraceOrCondition orCondition)
        return $"({GetExpression(orCondition.LeftExpression)} OR {GetExpression(orCondition.RightExpression)})";

    return string.Empty;
}

private static object? GetValue(UtilityNetworkAttributeDataType type, object? value)
{
    if (value is null)
        return value;

    switch (type)
    {
        case UtilityNetworkAttributeDataType.Boolean:
            return System.Convert.ToBoolean(value);
        case UtilityNetworkAttributeDataType.Double:
            return System.Convert.ToDouble(value);
        case UtilityNetworkAttributeDataType.Float:
            return System.Convert.ToSingle(value);
        case UtilityNetworkAttributeDataType.Integer:
            return System.Convert.ToInt32(value);
        default:
            break;
    }
    return value;
}

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if (traceResult is UtilityGeometryTraceResult geometryResult)
{
    if (geometryResult.Multipoint is Multipoint multipoint)
    {
        if (MainMapView.SpatialReference != null &&
            multipoint.SpatialReference != MainMapView.SpatialReference &&
            GeometryEngine.Project(multipoint, MainMapView.SpatialReference) is Multipoint projectedMultipoint)
            multipoint = projectedMultipoint;

        var graphic = new Graphic(multipoint, pointSymbol);
        overlay.Graphics.Add(graphic);
    }

    if (geometryResult.Polyline is Polyline polyline)
    {
        if (MainMapView.SpatialReference != null &&
            polyline.SpatialReference != MainMapView.SpatialReference &&
            GeometryEngine.Project(polyline, MainMapView.SpatialReference) is Polyline projectedPolyline)
            polyline = projectedPolyline;

        var graphic = new Graphic(polyline, lineSymbol);
        overlay.Graphics.Add(graphic);
    }

    if (geometryResult.Polygon is Polygon polygon)
    {
        if (MainMapView.SpatialReference != null &&
            polygon.SpatialReference != MainMapView.SpatialReference &&
            GeometryEngine.Project(polygon, MainMapView.SpatialReference) is Polygon projectedPolygon)
            polygon = projectedPolygon;

        var graphic = new Graphic(polygon, fillSymbol);
        overlay.Graphics.Add(graphic);
    }
}