Helper Method to get Umbraco ModelsBuilder Model Property Aliases

ModelsBuilderHelpers.cs

internal static string GetModelPropertyTypeAlias<TModel>(Expression<Func<TModel, object>> selector)
        where TModel : PublishedElementModel
    {
        Expression body = selector.Body;

        // Unwrap conversions, if any
        if (body is UnaryExpression unaryExpression && unaryExpression.NodeType == ExpressionType.Convert)
            body = unaryExpression.Operand;

        if (!(body is MemberExpression memberExpression))
            throw new ArgumentException("Not a property expression.", nameof(selector));

        ImplementPropertyTypeAttribute propertyTypeAttribute = memberExpression.Member.GetCustomAttribute<ImplementPropertyTypeAttribute>();
        if (string.IsNullOrWhiteSpace(propertyTypeAttribute?.Alias))
            throw new InvalidOperationException(
                $"Could not figure out property alias for property \"{memberExpression.Member.Name}\".");
        
        return propertyTypeAttribute.Alias;
    }