viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Mediator.cs

@@ -0,0 +1,48 @@
+using DaSaSo.Wpf.ViewModel.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel
+{
+    class Mediator
+    {
+        private static IDictionary<EMediator, List<Action<object>>> pl_dict = new Dictionary<EMediator, List<Action<object>>>();
+        public static void Subscribe(EMediator token, Action<object> callback)
+        {
+            if (!pl_dict.ContainsKey(token))
+            {
+                var list = new List<Action<object>>();
+                list.Add(callback);
+                pl_dict.Add(token, list);
+            }
+            else
+            {
+                bool found = false;
+                foreach (var item in pl_dict[token])
+                {
+                    if (item.Method.ToString() == callback.Method.ToString())
+                        found = true;
+                }
+                if (!found)
+                    pl_dict[token].Add(callback);
+            }
+        }
+        public static void Unsubscribe(EMediator token, Action<object> callback)
+        {
+            if (pl_dict.ContainsKey(token))
+                pl_dict[token].Remove(callback);
+        }
+
+        public static void Notify(EMediator token, object? args = null)
+        {
+            if (pl_dict.ContainsKey(token))
+            {
+                foreach (var callback in pl_dict[token])
+                    callback(args);
+            }
+        }
+    }
+}