ASP.NET Core MVC application insights stopped working after upgrade to .NET Core 1.1.1

Question

I have one simple ASP.NET Core application I was working on back in December 2016. It worked just fine with application insights and telemetry.

Now after 4 months I wanted to pick up this work and started with upgrade from .NET Core 1.1.0 to 1.1.1. In this process package Microsoft.ApplicationInsights.AspNetCore got updated from version 1.0.2 to version 2.0.0.

This unfortunately caused my app to stop working, in particular I get this error:

An error occurred during the compilation of a resource required to process this request. Please review the following specific error details and modify your source code appropriately.

/Views/Shared/_Layout.cshtml

'IHtmlHelper<dynamic>' does not contain a definition for 'ApplicationInsightsJavaScript' and no extension method 'ApplicationInsightsJavaScript' accepting a first argument of type 'IHtmlHelper<dynamic>' could be found (are you missing a using directive or an assembly reference?)
+
    @Html.ApplicationInsightsJavaScript(TelemetryConfiguration)

Show compilation source
#pragma checksum "/Views/Shared/_Layout.cshtml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "050a2afdfb4a44e17be72e76627a3d3a0d0b7d5a"
namespace AspNetCore
{
#line 1 "/Views/_ViewImports.cshtml"

Screen:

Upgrade from project.json to new csproj and using new Visual Studio 2017 doesn't help.

It looks like ApplicationInsightsJavaScript was basically removed from API. How do I enable javascript application insights then?

Answer 1

There are breaking changes from ApplicationInsights 1.x to 2.x which are documented on GitHub release notes.

• This release contains a rewrite of the SDK internals for better .NET Core integration and initialization.
• UseApplicationInsightsRequestTelemetry is obsolete, the logic it used to perform is handled automatically now and calls to this method should be deleted from Startup.cs.
• UseApplicationInsightsExceptionTelemetry is obsolete, exception telemetry is handled automatically internally now. You should delete calls to this method from Startup.cs otherwise you will get duplicate exception telemetry reported.
• The MVC dependency for the JavaScript snippet has been removed so in order to include the JavaScript snippet now you need to make the following changes:
  • In _ViewImports.cshtml replace @inject Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration TelemetryConfiguration with @inject Microsoft.ApplicationInsights.AspNetCore.JavaScriptSnippet JavaScriptSnippet
  • In _Layout.cshtml replace @Html.ApplicationInsightsJavaScript(TelemetryConfiguration) with @Html.Raw(JavaScriptSnippet.FullScript)