score:0

Accepted answer
var mykeys = objawithb.where(
    kvp => kvp.value.any(v => v.prop1.equals(objb.prop1) )
  ).select(kvp => kvp.key);

score:0

objawithb.where(g => g.value.any(b=>b.prop1.equals(objb.prop1)))
         .select(g => g.key).tolist();

score:0

dictionary<a, list<b>> objawithb = new dictionary<a, list<b>>();
b objb = new b();
objb.prop1 = "aaa";

objawithb.where(g => g.value.any(x => x.prop1 == objb.prop1))
         .select(g => g.key)
         .tolist();   

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