issue #270

Author: aliostad

Directory.Build.props

@@ -3,7 +3,7 @@
 	<Description>CacheCow is an HTTP Caching Library for .NET</Description>  
     <Authors>Ali Kheyrollahi</Authors>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <Version>2.10.0</Version>
+    <Version>2.11.0</Version>
 	<PackageProjectUrl>https://github.com/aliostad/CacheCow/</PackageProjectUrl>
 	<PackageLicenseExpression>MIT</PackageLicenseExpression>	
   </PropertyGroup>

src/Common/TraceWriter.cs

@@ -7,13 +7,30 @@ namespace CacheCow
 	internal static class TraceWriter
 	{
 		public const string CacheCowTraceSwitch = "CacheCow";
+        public const string CacheCowTracingEnvVarName = "CacheCow.Tracing.Switch";
+        private static bool _hasExaminedEnvVars = false;
+
+        // ALERT!! THIS NO LONGER WORKS https://github.com/dotnet/runtime/issues/67991
 		private static readonly TraceSwitch _switch = new TraceSwitch(CacheCowTraceSwitch, "CacheCow Trace Switch");
 
+        private static void ExamineEnvVar()
+        {
+            var envvarValue = Environment.GetEnvironmentVariable(CacheCowTraceSwitch) ?? "";
+            if (envvarValue.Length>0)
+            {
+                TraceLevel level;
+                if (Enum.TryParse(envvarValue, out level))
+                    _switch.Level = level;
+            }
+
+            _hasExaminedEnvVars = true;
+        }
 
         public static void WriteLine(string message, TraceLevel level, params object[] args)
+        {
 
-        //public static void WriteLine(Func<string> message, TraceLevel level, params object[] args)
-		{
+            if (!_hasExaminedEnvVars)
+                ExamineEnvVar();
 
 			if (_switch.Level < level)
 				return;
@@ -26,7 +43,7 @@ public static void WriteLine(string message, TraceLevel level, params object[] a
 			}
 			catch
 			{
-				// swallow 
+				// swallow
 			}