Compile with debug symbol

Author: Victor Hurdugaci

src/Microsoft.Framework.Logging.Debug/DebugLogger.cs

@@ -9,7 +9,7 @@ namespace Microsoft.Framework.Logging.Debug
     /// <summary>
     /// A logger that writes messages in the debug output window only when a debugger is attached.
     /// </summary>
-    public class DebugLogger : ILogger
+    public partial class DebugLogger : ILogger
     {
         private readonly Func<string, LogLevel, bool> _filter;
         private readonly string _name;
@@ -83,7 +83,7 @@ public void Log(LogLevel logLevel, int eventId, object state, Exception exceptio
             }
 
             message = $"{ logLevel }: {message}";
-            System.Diagnostics.Debug.WriteLine(message, _name);
+            DebugWriteLine(message, _name);
         }
     }
 }

src/Microsoft.Framework.Logging.Debug/DebugLogger.debug.cs

@@ -0,0 +1,18 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+// We need to define the DEBUG symbol because we want the logger
+// to work even when this package is compiled on release. Otherwise,
+// the call to Debug.WriteLine will not be in the release binary
+#define DEBUG
+
+namespace Microsoft.Framework.Logging.Debug
+{
+    public partial class DebugLogger
+    {
+        private void DebugWriteLine(string message, string name)
+        {
+            System.Diagnostics.Debug.WriteLine(message, name);
+        }
+    }
+}