IEnumerable can't convert to IQueryable

Question

Until now, I have a .net 4.7 library in which I use IQuery in this mode:

IQueryable<MyType> myIQueryable = mySource;

if(paramIsNew != null)
{
    myIQueryable = myIQueryable.where(x => x.IsNew == paramIsNew);
}

And so on for more parameters and conditions.

However, now I am trying to convert this library to a .net standard library, but I am getting the error that I can´t convert an IEnumerable to IQueryable, it exists and explicit conversion.

I don't see the problem really and how to solve it.

Answer 1

That's because Queryable class and so queryable-specific extension methods (like Where ), are not part of default .NET Standard libraries. So you use Enumerable.Where extension method, which returns IEnumerable . Your myIQueryable is of type IQueryable hence you are getting compiler error. You need to install System.Linq.Queryable nuget package, then your code with compile.