linq - Referencing outer SelectMany parameter from inner Select -

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i thought had got work before, don't see it:

discounts dictionary<parttype, double>. data list<parttype>.

var d = discounts.keys.selectmany(     k =>     data.where( l => l.parttypeid.equals( k.parttypeid ) ) )     .select( s => new { k, l } );

the error is, name 'k' (and 'l') not exist in current context.

what want apply double dictionary matching parttypes in data.

i suspect mean:

var d = discounts.keys.selectmany(     k => data.where(l => l.parttypeid.equals(k.parttypeid)),     (k, l) => new { k, l });

... it's hard tell without more information. honest looks want join, e.g.

var d = discounts.keys.join(data,            k => k.parttypeid, // key discounts.keys            l => l.parttypeid, // key data            (k, l) => new { k, l }); // projection 2 values

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