object reference not set to an instance of an object

Question

object reference not set to an instance of an object

LucaFagan opened this issue 4 years ago · comments

I keep getting "object reference not set to an instance of an object" worning in xaml designer even if the application works fine.

If I replace win:Visibility.Visible and win:Visibility.Collapsed with numeric values the error goes away so I thing the error is related to the name space. Any solution ?

xmlns:win="clr-namespace:System.Windows;assembly=PresentationCore"

Visibility="{c:Binding '(JobParamsOtt.MULTIPLY_RIP_TYPE == 1) ? win:Visibility.Visible : win:Visibility.Collapsed'}">

keytrap · Answer 1 · Mon Dec 14 2020 05:22:24 GMT+0800 (China Standard Time)

Try this :

xmlns:win="clr-namespace:System.Windows;assembly=PresentationCore"

Visibility="{c:Binding '(JobParamsOtt.MULTIPLY_RIP_TYPE == 1)'}">

If the condition is met, it wil be visible by default

Luca F · Answer 2 · Mon Dec 14 2020 06:19:43 GMT+0800 (China Standard Time)

I've tried the suggested approach, if condition is met the field is visible, otherwise it is collapsed.

keytrap · Answer 3 · Mon Dec 14 2020 06:24:24 GMT+0800 (China Standard Time)

I've tried the suggested approach, if condition is met the field is visible, otherwise it is collapsed.

I've edited my answer. I meant visible by default

Luca F · Answer 4 · Mon Dec 14 2020 06:26:49 GMT+0800 (China Standard Time)

Ah ok.

Thanks for the explanation.