table reader v1

AscNet.Common/Util/TableReader.cs

@@ -0,0 +1,32 @@
+using AscNet.Logging;
+
+namespace AscNet.Common.Util
+{
+    #pragma warning disable CS8618, CS8602 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+    public abstract class TableReader<TSelf, TScheme>
+    {
+        public List<TScheme> All { get; set; }
+        private readonly Logger c = new(typeof(TableReader<TSelf, TScheme>), nameof(TableReader<TSelf, TScheme>), LogLevel.DEBUG, LogLevel.DEBUG);
+        protected abstract string FilePath { get; }
+        private static TSelf _instance;
+        
+        public static TSelf Instance
+        {
+            get
+            {
+                _instance ??= Activator.CreateInstance<TSelf>();
+                // ReSharper disable once ConditionIsAlwaysTrueOrFalseAccordingToNullableAPIContract
+                if ((_instance as TableReader<TSelf, TScheme>).All == null)
+                {
+                    (_instance as TableReader<TSelf, TScheme>).Load();
+                    (_instance as TableReader<TSelf, TScheme>).c.Debug($"{typeof(TSelf).Name} Excel Loaded From {(_instance as TableReader<TSelf, TScheme>).FilePath}");
+                }
+
+                return _instance;
+            }
+        }
+        
+        protected abstract void Load();
+    }
+}
+