[question] Enumerable.Range(0,10).Select() not working

[jlvuolle]

Hi,

I am trying to execute following kind of expression

evaluator.Evaluate("Enumerable.Range(0, 10).Select(x => x * x)");

but I get following error for it:

CodingSeb.ExpressionEvaluator.ExpressionEvaluatorSyntaxErrorException: '[System.Linq.Enumerable+d__113] object has no Method named "Select".'

Interesting part is that this works in LINQPad (.NET Core 3.1.8) but not within Visual Studio (.NET Framework 4.7.2).

If I run following code in VS:

var result_a = Enumerable.Range(0, 10);
var result_b = evaluator.Evaluate("Enumerable.Range(0, 10)");

I can see that both variables have value
System.Linq.Enumerable.<RangeIterator>d__113}
but different types:

result_a: System.Collections.Generic.IEnumerable<int> {System.Linq.Enumerable.<RangeIterator>d__113}
result_b: object {System.Linq.Enumerable.<RangeIterator>d__113}

I don't get what is going on here and why it works in LINQPad but not in VS. Any hints?

[jlvuolle]

Found the trick: you have to use Cast(). So

evaluator.Evaluate("Enumerable.Range(0, 10).Cast().Select(x => x * x)");

works nicely. Case closed.