- add GBaseEntryChanged event

GBase.Api/GBaseEntryChangedEventArgs.cs

@@ -0,0 +1,23 @@
+// Author: Gockner, Simon
+// Created: 2020-03-06
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Api
+{
+    /// <summary>
+    /// <see cref="EventArgs"/> for the <see cref="INotifyGBaseEntryChanged"/> event
+    /// </summary>
+    public class GBaseEntryChangedEventArgs : EventArgs
+    {
+        public GBaseEntryChangedEventArgs(string propertyName, object value)
+        {
+            PropertyName = propertyName;
+            Value = value;
+        }
+
+        public string PropertyName { get; }
+        public object Value { get; }
+    }
+}

GBase.Api/INotifyGBaseEntryChanged.cs

@@ -0,0 +1,16 @@
+// Author: Gockner, Simon
+// Created: 2020-03-06
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Api
+{
+    /// <summary>
+    /// Notify the GBase that an entry has changed
+    /// </summary>
+    public interface INotifyGBaseEntryChanged
+    {
+        static event EventHandler<GBaseEntryChangedEventArgs> GBaseEntryChanged;
+    }
+}

GBase.Api/NotifyGBaseEntryChanged.cs

@@ -0,0 +1,26 @@
+// Author: Gockner, Simon
+// Created: 2020-03-06
+// Copyright(c) 2020 SimonG. All Rights Reserved.
+
+using System;
+
+namespace GBase.Api
+{
+    /// <summary>
+    /// Notify the GBase that an entry has changed
+    /// </summary>
+    public abstract class NotifyGBaseEntryChanged : INotifyGBaseEntryChanged
+    {
+        public event EventHandler<GBaseEntryChangedEventArgs> GBaseEntryChanged;
+
+        protected void RaiseGBaseEntryChanged(object sender, string propertyName, object value)
+        {
+            GBaseEntryChanged?.BeginInvoke(sender, new GBaseEntryChangedEventArgs(propertyName, value), GBaseEntryChangedCallback, null);
+        }
+
+        private void GBaseEntryChangedCallback(IAsyncResult asyncResult)
+        {
+            GBaseEntryChanged?.EndInvoke(asyncResult); //TestMe: Does this work? Or is there something to be done with the asyncResult
+        }
+    }
+}