Modified FeatureManager to accept optional parameters for FeatureFilters and SessionManagers.

[wenkepaul]

I'm working on a project which doesn't use IServiceCollection or C# 9, but would benefit from using this library. In order to do so, I need to be able to set the FeatureFilters property without using init. This PR addsEnumerable<IFeatureFilterMetadata> and IEnumerable<ISessionManager> as optional parameters to the FeatureManager constructor and uses their existing Enumerable.Empty as a fallback.

[wenkepaul]

@microsoft-github-policy-service agree

[jimmyca15]

@wenkepaul can you open up an issue so the problem can be discussed?

[wenkepaul]

@jimmyca15 issue 435 has been opened.

[zhiyuanliang-ms]

/AzurePipeline run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[zhiyuanliang-ms]

I need to be able to set the FeatureFilters property without using init.

Do you mean the IsExternalInit pattern will not resolve the init accessor issue for .NET Framework?
https://github.com/microsoft/FeatureManagement-Dotnet/blob/main/src/Microsoft.FeatureManagement/IsExternalInit.cs

[alexaka1]

@zhiyuanliang-ms For me in a 4.7.2 project that doesn't use the SDK style project, the IsExternalInit does not solve the build error.

[jimmyca15]

@zhiyuanliang-ms was this superseded by #450 ?

[zhiyuanliang-ms]

@zhiyuanliang-ms was this superseded by #450 ?

@jimmyca15 I think, yes.

@wenkepaul I will close this PR. If you think the current solution still cannot meet your need, feel free to open an issue to track it.