Make sure AzureAppServices logger is resolvable from DI contatiner (#1039)

src/Logging/Logging.AzureAppServices/src/AzureAppServicesLoggerFactoryExtensions.cs

@@ -35,6 +35,8 @@ namespace Microsoft.Extensions.Logging
                 return builder;
             }
 
+            builder.AddConfiguration();
+
             var config = SiteConfigurationProvider.GetAzureLoggingConfiguration(context);
             var services = builder.Services;
 

src/Logging/Logging.AzureAppServices/src/BlobLoggerProvider.cs

@@ -28,7 +28,7 @@ namespace Microsoft.Extensions.Logging.AzureAppServices
         /// Creates a new instance of <see cref="BlobLoggerProvider"/>
         /// </summary>
         /// <param name="options"></param>
-        internal BlobLoggerProvider(IOptionsMonitor<AzureBlobLoggerOptions> options)
+        public BlobLoggerProvider(IOptionsMonitor<AzureBlobLoggerOptions> options)
             : this(options, null)
         {
             _blobReferenceFactory = name => new BlobAppendReferenceWrapper(

src/Logging/Logging.AzureAppServices/src/FileLoggerProvider.cs

@@ -18,7 +18,7 @@ namespace Microsoft.Extensions.Logging.AzureAppServices
         private readonly int? _maxFileSize;
         private readonly int? _maxRetainedFiles;
 
-        internal FileLoggerProvider(IOptionsMonitor<AzureFileLoggerOptions> options) : base(options)
+        public FileLoggerProvider(IOptionsMonitor<AzureFileLoggerOptions> options) : base(options)
         {
             var loggerOptions = options.CurrentValue;
             _path = loggerOptions.LogDirectory;

src/Logging/Logging.AzureAppServices/test/LoggerBuilderExtensionsTests.cs

@@ -64,5 +64,15 @@ namespace Microsoft.Extensions.Logging.AzureAppServices.Test
 
             Assert.Equal(4, serviceCollection.Count(d => d.ServiceType == typeof(IConfigureOptions<LoggerFilterOptions>)));
         }
+
+        [Fact]
+        public void LoggerProviderIsResolvable()
+        {
+            var serviceCollection = new ServiceCollection();
+            serviceCollection.AddLogging(builder => builder.AddAzureWebAppDiagnostics(_appContext));
+
+            var serviceProvider = serviceCollection.BuildServiceProvider();
+            var loggerFactory = serviceProvider.GetService<ILoggerProvider>();
+        }
     }
 }