Converting from `NSDecimal` or `NSDecimalNumber` to C#'s `decimal` type

Question

I've got an NSDecimalNumber from StoreKit's SKProduct class, and I want to convert it to C#'s decimal type to minimize loss of precision. Is there a straightforward way to do such a thing?

I figure my two choices are:

1. Assume that I understand the binary implementation of each and do my own bit-wise conversion, or
2. Have NSDecimalNumber give me a string and then have decimal parse it.

I figure option 1 is way too much work and probably even brittle, so I'm inclined to go with option 2. But that doesn't seem like the best I can do, either. (I can live with how slow it'll be, because it happens exceptionally rarely.

Answer 1

Since Xamarin iOS SDK 12, operators are available for explicitly converting an NSDecimal to a decimal and implicitly converting a decimal to an NSDecimal.

Using these operators, you can take the following code as an example for achieving your goal:

var nsDecimalNumber = new NSDecimalNumber("128.478", new NSLocale("en-US"));
var nsDecimal = nsDecimalNumber.NSDecimalValue;
var csharpDecimal = (decimal)nsDecimal;
var nsDecimalAfterConversion = (NSDecimal)csharpDecimal;
var nsDecimalNumberAfterConversion = new NSDecimalNumber(nsDecimalAfterConversion);