System.InvalidOperationException : Could not create an instance of type 'Google.Cloud.Diagnostics.Common.IManagedTracer'. Model bound complex types must not be abstract or value types and must have a parameterless constructor.

Hi,

using .net core 1.1, and package <PackageReference Include="Google.Cloud.Diagnostics.AspNetCore" Version="1.0.0-alpha07" />

Mac:UDL-API$ dotnet --info
.NET Command Line Tools (1.0.1)

Product Information:
 `Version:`            1.0.1
 Commit SHA-1 hash:  005db40cd1

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.12
 OS Platform: Darwin
 RID:         osx.10.12-x64
 Base Path:   /usr/local/share/dotnet/sdk/1.0.1

i get the error ’ System.InvalidOperationException : Could not create an instance of type ‘Google.Cloud.Diagnostics.Common.IManagedTracer’. Model bound complex types must not be abstract or value types and must have a parameterless constructor.’

• startup.Configure() contains app.UseGoogleTrace()
• startup.ConfigureServices() contains services.AddGoogleTrace(Configuration[“AppSettings:GoogleProjectID”]);
• my post http controller contains tracer.StartSpan(nameof(GetWellData)); (& endspan()).

That may be an issue on my side, but the documentation at http://googlecloudplatform.github.io/google-cloud-dotnet/docs/Google.Cloud.Diagnostics.AspNetCore/ does not really give much more clue on what is going on.

[iantalarico]

@Jonathan34 also a note (I will add this in the docs when I update them) the IManagedTracer is a singleton. I would suggest injecting it into the constructor of the controller and using it that way (no need for the [FromServices] attribute).

[iantalarico]

@Jonathan34 Awesome glad everything is working. I will be sure to add an example to our docs to make this a little more clear.

I’ll use this to track updating the docs and close this once I have a PR in.

Thanks for the feedback!