What’s the difference?
decimal.Round(xx, decimalPos, MidpointRounding.ToEven);
decimal.Round(xx, decimalPos, MidpointRounding.AwayFromZero);
AwayFromZero, is the commonly used rounding.
ToEven, is more special, called rounding to nearest or rounding to 50%
e.g. 22.333 to 22.33 22.335 to 22.34 22.325 to 22.32 22.336 to 22.34 22.326 to 22.33
The case of 5 in the back is special. If the front is an odd number, it will go up. Otherwise, it will be cut off. In financial settlement, this method is often used to balance the profit and loss of both parties.