NullValue Not Being Displayed

[Jeremie]

Hello,

I am using the NumericUpDown with a binding to a nullable short property on my ViewModel. The NumericUpDown is declared as follows

<telerik:RadNumericUpDown Value="{Binding Path=CurrentOEMOriginalQuantity, ValidatesOnDataErrors=True}" Grid.Row="1" Grid.Column="2" Margin="0,0,2,0"
                                                              NumberDecimalDigits="0" UpdateValueEvent="PropertyChanged" ShowButtons="False" NullValue=""/>

And the ViewModel property is defined as

public short? CurrentOEMOriginalQuantity
    {
      get
      {
        if (adapter == null || adapter.CurrentOEMOriginalCost == null)
          return null;
        else
          return adapter.CurrentOEMOriginalCost.QuantityOnHand;
      }
      set
      {
        if (adapter == null || adapter.CurrentOEMOriginalCost == null)
          return;

        adapter.CurrentOEMOriginalCost.QuantityOnHand = value;
        RaisePropertyChanged(() => this.CurrentOEMOriginalQuantity);
      }
    }

However, the value that is displayed on load is a 0.  I put a breakpoint in the getter of the property and it is indeed returning null.

What am I missing here?

Thanks.

[Valeri Hristov]

Hello Jeremie,

The Type of the Value property of RadNumericUpDown is Nullable<double> and since Nullable<short> is not automatically converted to Nullable<double>, the control always displays its default value - 0. You should use a IValueConverter that converts the two types in the binding to make the application to work.

All the best,
Valeri Hristov
the Telerik team