linq - c# FsCheck cannot convert lambda expression -

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i'm trying c# fscheck generator generate series of commands initialized random strings. came following solution:

public gen<command<a,b>> next(b value) {   var gen1 = arb.default.string().generator;   var gen2 = gen.two(gen1);   var gen3 = gen2.select((command<a,b>)(s => new derivedcommand(s.item1,s.item2)))    //derivedcommand extends command<a,b>    return gen.oneof(gen3); }

however, vs cannot build code:

cannot convert lambda expression type command<a,b> because not delegate type

i have searched solutions error message, nothing found helped. using system.linq , system.data.entity. suggestions resolving issue appreciated.

you're trying cast (s => new derivedcommand(s.item1,s.item2)), lambda expression, (command<a,b>), (i assume) class.

you need like:

var gen3 = gen2.select(s => (command<a,b>)(new derivedcommand(s.item1,s.item2)));

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