dependency injection exception instead of null about azure-functions-dotnet-extensions

[OneCyrus]

the specification of IServiceProvider defines it as follow:

Returns
Object
A service object of type serviceType.

-or-

null if there is no service object of type serviceType.

https://docs.microsoft.com/en-us/dotnet/api/system.iserviceprovider.getservice?view=netcore-3.1

[OneCyrus]

another strange thing is the dependency on Microsoft.Extensions.DependencyInjection here:

azure-functions-dotnet-extensions/src/Extensions/Extensions.csproj

Line 28 in ce4e8c4

<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.2.0" />

this is actually not used at all. the DI is based on a custom DI implementation in the azure functions host.

[galvesribeiro]

I completely agree this is totally wrong. If you inject the IServiceProvider and call GetService() it return null:

With that in mind, I believe it is the host that is throwing and not the actual service provider...

[galvesribeiro]

@fabiocav do you this issue should be opened on the Host repo or here?

[fabiocav]

Apologies for the late response here.

This is indeed a host behavior and we just closed a similar issue with information about the plans here.

Closing this as "won't fix", as we won't be changing the behavior of the in-proc experience, but the comment linked above provides more details about the plans moving forward.