Initial commit

Initial commit til Git.
V2 er deployed

PointOfSale/Utilities/ESCPOS_NET/Extensions/Util.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+
+namespace ESCPOS_NET.Extensions
+{
+    public static class Util
+    {
+        /// <summary>
+        /// Adds to the list of T items and/or enumerables of T. All other types will be ignored and not added to the list.
+        /// </summary>
+        /// <typeparam name="T">List's items type.</typeparam>
+        /// <param name="list">List to be added the items.</param>
+        /// <param name="items">Items to be added.</param>
+        /// <returns>True if no item was ignored, otherwise False.</returns>
+        public static bool AddRange<T>(this List<T> list, params object[] items)
+        {
+            bool ignoredItems = false;
+            foreach (var item in items)
+            {
+                if (item is T itemT)
+                {
+                    list.Add(itemT);
+                }
+                else if (item is IEnumerable<T> arrayT)
+                {
+                    list.AddRange(arrayT);
+                }
+                else
+                {
+                    ignoredItems = true;
+                }
+            }
+
+            return !ignoredItems;
+        }
+    }
+}