Add configuration to logging in WebHost

src/Microsoft.AspNetCore/WebHost.cs

@@ -175,8 +175,9 @@ namespace Microsoft.AspNetCore
                         config.AddCommandLine(args);
                     }
                 })
-                .ConfigureLogging(logging =>
+                .ConfigureLogging((hostingContext, logging) =>
                 {
+                    logging.UseConfiguration(hostingContext.Configuration.GetSection("Logging"));
                     logging.AddConsole();
                     logging.AddDebug();
                 })

test/Microsoft.AspNetCore.FunctionalTests/WebHostFunctionalTests.cs

@@ -200,6 +200,47 @@ namespace Microsoft.AspNetCore.Tests
             }
         }
 
+        [Fact]
+        public void LoggingConfigurationSectionPassedToLoggerByDefault()
+        {
+            try
+            {
+                File.WriteAllText("appsettings.json", @"
+{
+    ""Logging"": {
+        ""LogLevel"": {
+            ""Default"": ""Warning""
+        }
+    }
+}
+");
+                using (var webHost = WebHost.Start(context => context.Response.WriteAsync("Hello, World!")))
+                {
+                    var factory = (ILoggerFactory)webHost.Services.GetService(typeof(ILoggerFactory));
+                    var logger = factory.CreateLogger("Test");
+
+                    logger.Log(LogLevel.Information, 0, "Message", null, (s, e) =>
+                    {
+                        Assert.True(false);
+                        return string.Empty;
+                    });
+
+                    var logWritten = false;
+                    logger.Log(LogLevel.Warning, 0, "Message", null, (s, e) =>
+                    {
+                        logWritten = true;
+                        return string.Empty;
+                    });
+
+                    Assert.True(logWritten);
+                }
+            }
+            finally
+            {
+                File.Delete("appsettings.json");
+            }
+        }
+
         private async Task ExecuteStartOrStartWithTest(Func<DeploymentResult, Task<HttpResponseMessage>> getResponse, string applicationName)
         {
             await ExecuteTestApp(applicationName, async (deploymentResult, logger) =>

test/TestSites/CreateDefaultBuilderApp/Program.cs

@@ -24,7 +24,6 @@ namespace CreateDefaultBuilderApp
             string responseMessage = string.Empty;
 
             WebHost.CreateDefaultBuilder(new[] { "--cliKey", "cliValue" })
-                .UseLoggerFactory(new TestLoggerFactory())
                 .ConfigureServices((context, services) =>
                 {
                     responseMessage = GetResponseMessage(context, services);
@@ -77,34 +76,11 @@ namespace CreateDefaultBuilderApp
                 return $"Command line arguments not loaded into Configuration.";
             }
 
-            var testLoggerFactory = (TestLoggerFactory)context.LoggerFactory;
-
-            // Verify AddConsole called
-            if (!testLoggerFactory.Providers.Any(provider => provider is ConsoleLoggerProvider))
-            {
-                return $"Console logger not added to ILoggerFactory.";
-            }
-
-            // Verify AddDebug called
-            if (!testLoggerFactory.Providers.Any(provider => provider is DebugLoggerProvider))
-            {
-                return $"Debug logger not added to ILoggerFactory.";
-            }
-
+            // TODO: Verify AddConsole called
+            // TODO: Verify AddDebug called
             // TODO: Verify UseIISIntegration called
 
             return context.HostingEnvironment.ApplicationName;
         }
-
-        private class TestLoggerFactory : ILoggerFactory
-        {
-            public IList<ILoggerProvider> Providers { get; } = new List<ILoggerProvider>();
-
-            public void AddProvider(ILoggerProvider provider) => Providers.Add(provider);
-
-            public ILogger CreateLogger(string categoryName) => NullLogger.Instance;
-
-            public void Dispose() { }
-        }
     }
 }