RadMaskedNumericInput throws exception with FormatString set to "D" or "d"

[Robert]

I'm trying to use the RadMaskedNumericInput control in non-masking mode, and using the StringFormat to define an integer. According to the Standard Numeric Format Strings article from Microsoft, which Telerik references for using string formats, I should use either a "D" or "d" for the format string to get the desired result. However on running the code where I set it to that I get an exception that says "Format specifier was invalid" with the following stack trace:

   at System.Number.FormatDouble(Double value, String format, NumberFormatInfo info)
   at System.Double.ToString(String format, IFormatProvider provider)
   at Telerik.Windows.Controls.RadMaskedNumericInput.CoerceTextNoMask(Nullable`1 value)
   at Telerik.Windows.Controls.RadMaskedNumericInput.CoerceText(Nullable`1 value, Int32& selectionStart)
   at Telerik.Windows.Controls.RadMaskedNumericInput.CoerceTextOverride(Int32& selectionStart)
   at Telerik.Windows.Controls.RadMaskedInputBase.CoerceText()
   at Telerik.Windows.Controls.RadMaskedInputBase.ProcessValueChanged()
   at Telerik.Windows.Controls.RadMaskedInputBase.OnFormatStringChanged(DependencyObject d, DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   at System.Windows.Baml2006.WpfMemberInvoker.SetValue(Object instance, Object value)
   at MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(XamlMember member, Object obj, Object value)
   at MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(Object inst, XamlMember property, Object value)

Is there any way to limit the box to integers in no-mask mode?  Thanks!

[Pavel R. Pavlov]

Hi Robert,

You need to keep in mind that the Value of the RadMaskedNumericInput control is of type nullable decimal (decimal?). On the other hand the format specifier "D" or "d" is used only over integer values. This is why you get the exception.

You can try to bind the native TextBox control to a double value and apply the "D" format specifier. If you do so you will replicate the same exception.

Also, you need to have in mind that the FormatString is applied only when the RadMaskedNumericInput is not focused. Hence, when you focus the control the Mask will be applied. Please have in mind that when you have defined no-mask you will not be able to enter a decimal point. This functionality is not yet implemented.

Regards,
Pavel R. Pavlov
Telerik

[Robert]

Ah, that explains it.

After looking further, it appears the RadNumericUpDown control might better suit my needs, especially as it still supports nullable value types.

Thanks!