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13137179
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2012-10-30T10:35:22.117
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2012-10-30T10:35:22.117
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Since (comments) you mention that you're open to the option of changing the return type, I would declare something like: <pre><code>public class TradeRisk { public int Id {get;set;} public string TCN {get;set;} // expand name to be meaningful public string Currency {get;set;} public decimal UsdValue {get;set;} } </code></pre> and change the method to return <code>List<TradeRisk></code>. We can apply the same <code>DataColumn</code> tricks as in my previous answer, but change the result - noting that to keep the results the same we need to preserve the <code>Distinct</code> etc. <pre><code>var tradeId = tradeTableToFilter.Columns["TradeID"]; var currency = tradeTableToFilter.Columns["CURRENCY"]; var calculatedRisk = (from DataRow tradeRow in tradeTableToFilter.Rows let tradeIdVal = tradeRow[tradeId] where tradeIdVal != null select new { Id = 0, TCN = tradeIdVal.ToString(), Currency = tradeRow[currency], UsdValue = calculator.Invoke(tradeRow) }).Distinct(); return (from row in calculatedRisk select new TradeRisk { Id = row.Id, TCN = row.TCN, Currency = row.Currency, UsdValue = row.UsdValue }).ToList(); </code></pre> This avoid all the <code>DataTable</code> overheads. If we really wanted, we could also implement <code>TradeRisk : IEquatable<TradeRisk></code>, and then just do: <pre><code>return ( from DataRow tradeRow in tradeTableToFilter.Rows let tradeIdVal = tradeRow[tradeId] where tradeIdVal != null select new TradeRisk { Id = 0, TCN = tradeIdVal.ToString(), Currency = tradeRow[currency], UsdValue = calculator.Invoke(tradeRow) }).Distinct().ToList(); </code></pre>
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1. POOptimize code for transforming one datatable into another
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1. USMarc Gravell
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A row detail

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