Application Insights ASP.NET Core SDK by default reads application's IConfiguration and all properties of ApplicationInsightsServiceOptions from configuration

CHANGELOG.md

@@ -1,13 +1,15 @@
 # Changelog
 
 ## VNext
+- [Application Insights ASP.NET Core SDK by default reads application's IConfiguration and all properties of ApplicationInsightsServiceOptions from configuration](https://github.com/microsoft/ApplicationInsights-dotnet/pull/1850)
 - [End support for NetStandard 1.x, Add support for NetStandard 2.0](https://github.com/microsoft/ApplicationInsights-dotnet/issues/1160)
 - [Add support for SourceLink.Github to all SDKs.](https://github.com/microsoft/ApplicationInsights-dotnet/issues/1760)
 
+
 ## Version 2.15.0-beta1
 - [WorkerService package is modified to depend on 2.1.1 on Microsoft.Extensions.DependencyInjection so that it can be used in .NET Core 2.1 projects without nuget errors.](https://github.com/microsoft/ApplicationInsights-dotnet/issues/1677)
 - [Adding a flag to EventCounterCollector to enable/disable storing the EventSource name in the MetricNamespace and simplify the metric name](https://github.com/microsoft/ApplicationInsights-dotnet/issues/1341)
-- [New: EventCounter to track Ingestion Endpoint Response Time] (https://github.com/microsoft/ApplicationInsights-dotnet/pull/1796)
+- [New: EventCounter to track Ingestion Endpoint Response Time](https://github.com/microsoft/ApplicationInsights-dotnet/pull/1796)
 
 ## Version 2.14.0
 - no changes since beta.

NETCORE/src/Microsoft.ApplicationInsights.AspNetCore/Extensions/DefaultApplicationInsightsServiceConfigureOptions.cs

@@ -15,24 +15,34 @@
     internal class DefaultApplicationInsightsServiceConfigureOptions : IConfigureOptions<ApplicationInsightsServiceOptions>
     {
         private readonly IHostingEnvironment hostingEnvironment;
+        private readonly IConfiguration userConfiguration;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="DefaultApplicationInsightsServiceConfigureOptions"/> class.
         /// </summary>
         /// <param name="hostingEnvironment"><see cref="IHostingEnvironment"/> to use for retreiving ContentRootPath.</param>
-        public DefaultApplicationInsightsServiceConfigureOptions(IHostingEnvironment hostingEnvironment)
+        /// <param name="configuration"><see cref="IConfiguration"/>  from an application.</param>
+        public DefaultApplicationInsightsServiceConfigureOptions(IHostingEnvironment hostingEnvironment, IConfiguration configuration = null)
         {
             this.hostingEnvironment = hostingEnvironment;
+            this.userConfiguration = configuration;
         }
 
         /// <inheritdoc />
         public void Configure(ApplicationInsightsServiceOptions options)
         {
             var configBuilder = new ConfigurationBuilder()
-                .SetBasePath(this.hostingEnvironment.ContentRootPath ?? Directory.GetCurrentDirectory())
-                .AddJsonFile("appsettings.json", true)
-                .AddJsonFile(string.Format(CultureInfo.InvariantCulture, "appsettings.{0}.json", this.hostingEnvironment.EnvironmentName), true)
-                .AddEnvironmentVariables();
+                .SetBasePath(this.hostingEnvironment.ContentRootPath ?? Directory.GetCurrentDirectory());
+#if NETSTANDARD2_0 || NET461
+            if (this.userConfiguration != null)
+            {
+                configBuilder.AddConfiguration(this.userConfiguration);
+            }
+#endif
+            configBuilder.AddJsonFile("appsettings.json", true)
+                         .AddJsonFile(string.Format(CultureInfo.InvariantCulture, "appsettings.{0}.json", this.hostingEnvironment.EnvironmentName), true)
+                         .AddEnvironmentVariables();
+
             ApplicationInsightsExtensions.AddTelemetryConfiguration(configBuilder.Build(), options);
 
             if (Debugger.IsAttached)

NETCORE/src/Shared/Extensions/ApplicationInsightsExtensions.cs

@@ -59,6 +59,11 @@ public static partial class ApplicationInsightsExtensions
         private const string DeveloperModeForWebSites = "APPINSIGHTS_DEVELOPER_MODE";
         private const string EndpointAddressForWebSites = "APPINSIGHTS_ENDPOINTADDRESS";
 
+#if NETSTANDARD2_0 || NET461
+        private const string ApplicationInsightsSectionFromConfig = "ApplicationInsights";
+        private const string TelemetryChannelSectionFromConfig = "ApplicationInsights:TelemetryChannel";
+#endif
+
         [SuppressMessage("Microsoft.Performance", "CA1823:AvoidUnusedPrivateFields", Justification = "Used in NetStandard2.0 build.")]
         private const string EventSourceNameForSystemRuntime = "System.Runtime";
 
@@ -224,26 +229,9 @@ public static IConfigurationBuilder AddApplicationInsightsSettings(
         }
 
         /// <summary>
-        /// Read from configuration
-        /// Config.json will look like this:
-        /// <para>
-        ///      "ApplicationInsights": {
-        ///          "InstrumentationKey": "11111111-2222-3333-4444-555555555555",
-        ///          "TelemetryChannel": {
-        ///              "EndpointAddress": "http://dc.services.visualstudio.com/v2/track",
-        ///              "DeveloperMode": true
-        ///          }
-        ///      }.
-        /// </para>
-        /// Or.
-        /// <para>
-        ///      "ApplicationInsights": {
-        ///          "ConnectionString" : "InstrumentationKey=11111111-2222-3333-4444-555555555555;IngestionEndpoint=http://dc.services.visualstudio.com"
-        ///          "TelemetryChannel": {
-        ///              "DeveloperMode": true
-        ///          }
-        ///      }.
-        /// </para>
+        /// Read configuration from appSettings.json, appsettings.{env.EnvironmentName}.json,
+        /// IConfiguation used in an application and EnvironmentVariables. 
+        /// Bind configuration to ApplicationInsightsServiceOptions.
         /// Values can also be read from environment variables to support azure web sites configuration.
         /// </summary>
         /// <param name="config">Configuration to read variables from.</param>
@@ -254,6 +242,11 @@ internal static void AddTelemetryConfiguration(
         {
             try
             {
+#if NETSTANDARD2_0 || NET461
+                config.GetSection(ApplicationInsightsSectionFromConfig).Bind(serviceOptions);
+                config.GetSection(TelemetryChannelSectionFromConfig).Bind(serviceOptions);
+#endif
+
                 if (config.TryGetValue(primaryKey: ConnectionStringEnvironmentVariable, backupKey: ConnectionStringFromConfig, value: out string connectionStringValue))
                 {
                     serviceOptions.ConnectionString = connectionStringValue;

NETCORE/src/Shared/Extensions/ApplicationInsightsServiceOptions.cs

@@ -170,7 +170,11 @@ internal void CopyPropertiesTo(ApplicationInsightsServiceOptions target)
                 target.InstrumentationKey = this.InstrumentationKey;
             }
 
-            target.ConnectionString = this.ConnectionString;
+            if (!string.IsNullOrEmpty(this.ConnectionString))
+            {
+                target.ConnectionString = this.ConnectionString;
+            }
+
             target.ApplicationVersion = this.ApplicationVersion;
             target.EnableAdaptiveSampling = this.EnableAdaptiveSampling;
             target.EnableDebugLogger = this.EnableDebugLogger;