NumericUpDown Exponent displayed for decimal type

When binding a decimal? to the value of a NumericUpDown control it still formats the value like a double with showing the exponent like 5E-05 instead of 0,00005.

Doesn’t the NumericUpDown Control just use the ToString method of the value Property? Like in the example below a decimal ToString print the value with zeros not with exponent.

(0.00005).ToString()   // 5E-05
((decimal)(0.00005)).ToString()   // 0,00005

At the moment i made a workaround setting the StringFormat of the NumericUpDown controls

<Style BasedOn="{StaticResource {x:Type mah:NumericUpDown}}" TargetType="{x:Type mah:NumericUpDown}">
    <Setter Property="StringFormat" Value="0.##########################" />
</Style>

But i was woundering why the NumericUpDown control behave like that. Will the value internal be converted to a double?

[timunie]

Hi @Kabennsky at the Moment the value is converted into a double, also if you bind to a decimal. I had a short discussion with @punker76 and he explained that we cannot change the value to decimal and it will cover all types, because they have different min, max and precision: https://exceptionnotfound.net/decimal-vs-double-and-other-tips-about-number-types-in-net/

one idea was to add an enum where the user can choose the type of the value. The default would be double. At the moment this is just an idea, so will see if he gets it to work or not.

public enum ValueType
{
  Double,
  Decimal,
  Int,
  Long.
  ...
}

Happy coding Tim

[paulovila]

Is it possible to support decimal/nullable decimal so that there is no conversion to/from other numeric types?