Cannot convert expression type to return type

Question

I have the following method that works:

public Option<IAppSettings> GetFirst<T>() where T : IAppSettings
{
  return _sources.Where(x=>x.GetType() == typeof(T)).FirstOption();
}

List<IAppSettings> _sources;

But I want to change the signature to:

public Option<T> GetFirst<T>() where T : IAppSettings

Please note that I return the general TinsteadIAppSettings

I get an error (truncated types):

Cannot convert expression type Option<IAppSettings>toOption<T>

I know that this has anything to do with generics, but, admittedly, suck them ... I tried different means in, out, interface, delegate... but none worked as a method for non-general of the class using a variable instance.

Is it possible?

Updated thoughts

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Option scalesque

Answer 1

Enumerable.OfType. Where().

https://msdn.microsoft.com/en-us/library/vstudio/bb360913(v=vs.100).aspx

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Answer 2

.OfType() .FirstOption().