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This PR addresses issue #1573 by modifying the GetDeserializer logic to map nullable decimal values to 0m instead of null. #2167

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5 changes: 5 additions & 0 deletions Dapper/SqlMapper.cs
Original file line number Diff line number Diff line change
Expand Up @@ -1973,6 +1973,11 @@ private static Func<DbDataReader, object> GetDeserializer(Type type, DbDataReade
}
return GetTypeDeserializer(type, reader, startBound, length, returnNullIfFirstMissing);
}
// Patch for nullable decimal issue
if (type == typeof(decimal?))
{
return r => r.IsDBNull(startBound) ? (object)0m : r.GetDecimal(startBound);
}
return GetSimpleValueDeserializer(type, underlyingType ?? type, startBound, useGetFieldValue);
}

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