Refactor more mappers

src/Umbraco.Web/Models/Mapping/MapperContextExtensions.cs

@@ -0,0 +1,45 @@
+using Umbraco.Core.Mapping;
+
+namespace Umbraco.Web.Models.Mapping
+{
+    /// <summary>
+    /// Provides extension methods for the <see cref="MapperContext"/> class.
+    /// </summary>
+    internal static class MapperContextExtensions
+    {
+        private const string CultureKey = "Map.Culture";
+        private const string IncludedPropertiesKey = "Map.IncludedProperties";
+
+        /// <summary>
+        /// Gets the context culture.
+        /// </summary>
+        public static string GetCulture(this MapperContext context)
+        {
+            return context.HasItems && context.Items.TryGetValue(CultureKey, out var obj) && obj is string s ? s : null;
+        }
+
+        /// <summary>
+        /// Sets a context culture.
+        /// </summary>
+        public static void SetCulture(this MapperContext context, string culture)
+        {
+            context.Items[CultureKey] = culture;
+        }
+
+        /// <summary>
+        /// Get included properties.
+        /// </summary>
+        public static string[] GetIncludedProperties(this MapperContext context)
+        {
+            return context.HasItems && context.Items.TryGetValue(IncludedPropertiesKey, out var obj) && obj is string[] s ? s : null;
+        }
+
+        /// <summary>
+        /// Sets included properties.
+        /// </summary>
+        public static void SetIncludedProperties(this MapperContext context, string[] properties)
+        {
+            context.Items[IncludedPropertiesKey] = properties;
+        }
+    }
+}