public async Task <ActionResult <string> > Post(AK ak) { BigInteger a; uint k; try { if (ak.a == null || ak.k == null) { throw new FormatException(); } a = BitOperation.BinStrToBigInteger(ak.a); k = Convert.ToUInt32(ak.k, 10); if (k > 31 || ak.a.Length > 32) { throw new FormatException(); } } catch (FormatException) { ModelState.AddModelError("Error", "Некорректные параметры"); return(BadRequest(ModelState)); } return(await Task.Run(() => BitOperation.BigIntegerToBinStr(BitOperation.ChangeBit(a, k)))); }