.NET: Inferred generic types on static methods

Question

Suppose I have

public static List Map(List inputs, Func f)
{
    return inputs.ConvertAll((x) => f(x));
}

pr         


        

Answer 1

The inference fails at inferring the type of the delegate, not the list:

// this is also fine
var outputs3 = Map(inputs, new Func(Square));

// more calls that compile correctly
var outputs4 = Map(inputs, x => Square(x));

var outputs5 = Map(inputs, x => x * x);

Func t = Square;
var outputs6 = Map(inputs, t);

I don't know why, though - perhaps there's just no implicit typecast from the signature of Square to Func? It seems strange that Func t = Square; is valid, but the compiler can't make the leap on its own... Bug, maybe?