Cast object to decimal? (nullable decimal)

Question

If have this in the setter of a property:

decimal? temp = value as decimal?;

value = \"90\"

But after the cast, temp is nul

Answer 1

you should parse the decimal. But if you want your decimal to be null when the string is not correct, use TryParse :

decimal parsedValue;
decimal? temp = decimal.TryParse(value, out parsedValue)
                ? value
                : (decimal?)null;

This way you will avoid exceptions while parsing ill formated strings.

Almost all primitive types provide a Parse and TryParse methods to convert from string.

Is is also recommended to pass a culture for the provider argument to the method to avoid problems with the decimal separator. If you're reading from another system, CultureInfo.InvariantCulture is probably the way to go (but it's not the default).

bool TryParse(string s, NumberStyles style,
  IFormatProvider provider, out decimal result)