added missing file

Author: Kody Brown

EssentialCSharp/Chapter13/Listing13.17.CSharpConceptualEquivalentOfEventCILCode.cs

@@ -0,0 +1,46 @@
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Listing13_17
+{
+    using System;
+
+    public class Thermostat
+    {
+        // ...
+        // Declaring the delegate field to save the 
+        // list of subscribers.
+        private EventHandler<TemperatureArgs> _OnTemperatureChange;
+
+        public void add_OnTemperatureChange(
+            EventHandler<TemperatureArgs> handler)
+        {
+            System.Delegate.Combine(_OnTemperatureChange, handler);
+        }
+
+        public void remove_OnTemperatureChange(
+            EventHandler<TemperatureArgs> handler)
+        {
+            System.Delegate.Remove(_OnTemperatureChange, handler);
+        }
+
+        //public event EventHandler<TemperatureArgs> OnTemperatureChange
+        //{
+        //    //Would cause a compiler error.
+        //    add
+        //    {
+        //        add_OnTemperatureChange(value);
+        //    }
+        //    //Would cause a compiler error.
+        //    remove
+        //    {
+        //        remove_OnTemperatureChange(value);
+        //    }
+        //}
+
+        public class TemperatureArgs : System.EventArgs
+        {
+            public TemperatureArgs(float newTemperature)
+            {
+            }
+
+        }
+    }
+}

EssentialCSharp/Chapter13/chapter13.csproj

@@ -70,6 +70,7 @@
     <Compile Include="Listing13.04.InvokingADelegate.cs" />
     <Compile Include="Listing13.13.DeclaringAGenericDelegateType.cs" />
     <Compile Include="Listing13.16.DeclaringTheOnTemperatureChangeEvent.cs" />
+    <Compile Include="Listing13.17.CSharpConceptualEquivalentOfEventCILCode.cs" />
     <Compile Include="Listing13.18.CustomAddAndRemoveHandlers.cs" />
     <Compile Include="Listing13.15.UsingCustomDelegateType.cs" />
     <Compile Include="Listing13.14.FiringTheEventNotification.cs" />