passing data from view model not working

Question

Hello ,

I have this text field

<Border BindingContext="{Binding Source={RelativeSource TemplatedParent}}"
                    StrokeThickness="0"
                    StrokeShape="RoundRectangle 10">
                    <Entry Text="{Binding FullName , Mode=TwoWay}" 
                       Margin="8,0,8,0"
                       BackgroundColor="{AppThemeBinding Light={StaticResource CardColorLight},
                            Dark={StaticResource CardColorDark}}"/>
                </Border>

and viewModel

 public SignUpViewModel()
        {
            Title = AppResources.SignUp;
            SignUpCommand = new Command(SignUp);  
            
        }
        private void SignUp(object obj)
        {
            var user = FulltName;
        }

and the SignupPage.xaml

 public SignUpPage()
        {
            InitializeComponent();
            BindingContext= new SignUpViewModel();
        }

when I type value in Text entry field, then click on Signup page, the FullName value will be null

Note : if I removed the border, it will work

Answer 1

Hello,

I noticed that you used a Relative Binding method in Border, which caused the BindingContext to change to TemplatedParent inside the Border tag.

Please refer to this official documentation to get more details: Relative bindings.

Therefore, you need to delete BindingContext inside the Border to make the ViewModel work.

Best Regards,

Alec Liu.

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