#Telerik passwordbox mvvm code
#Telerik passwordbox mvvm password

Return !Validation.GetHasError(obj) & LogicalTreeHelper.GetChildren(obj).OfType().All(IsValid) įirstly you should declare DoubleProperty as Nullable: public double? DoubleProperty Private bool IsValid(DependencyObject obj)

#Telerik passwordbox mvvm code

Like so: Īnd in the code behind private void Save_CanExecute(object sender, CanExecuteRoutedEventArgs e)Į.CanExecute = IsValid(sender as DependencyObject) To prevent the submit button from being enabled you can add a CanExecute event to it that checks if the wpf window is valid. Once you add a validation rule the text box will raise an error on the text field if your ValidationRule class says its not a valid value. Return new ValidationResult(canConvert, 'Not a valid double') Public override ValidationResult Validate(object value, cultureInfo)īool canConvert = double.TryParse(value as string, out result) Here is a sample NumberValidationRule public class NumberValidationRule : ValidationRule In the above example you need to define a class NumberValidationRule that inherits ValidationRule. This will prevent the user from being able to press the Submit button unless a valid value is entered thereby eliminating your need to check if the DoubleProperty value is valid or not upon submit because it will only be valid when the submit button is enabled. You can attach a Validation Rule to the binding of the textbox that checks if the value is a valid double. How can I perform this validation correctly? Should I bind it to a string property so that I can get the entered text, and try to parse it to a double value to see if the input is correct? Or is there a better way of doing this? Therefore, I'm unable to figure out if the user has actually entered a value of 0 or if there has been an incorrect input. As the Text property of the textbox is bound to a property of type double in the ViewModel, the ViewModel property contains the default value, 0.0, and I'm unable to find out the text entered by the user. However, the user can still go ahead and click on Submit to invoke a ViewModel command. If I now enter a text value (say, abc) in the textbox, upon losing focus, the textbox is highlighted indicating an incorrect value. I have a textbox, which is bound to a property in my ViewModel of type double with a default value of 0.0.

#Telerik passwordbox mvvm password

But it may pay off with more and more password boxes.I'm creating a WPF application using MVVM. Whether it has saved me lines of code, I'm not sure.

Public PassableProperty Password2Property Private readonly PassableProperty m_password2Property Public PassableProperty Password1Property Private readonly PassableProperty m_password1Property New Propert圜hangedEventArgs(sPropertyName)) Private void RaisePropert圜hanged(string sPropertyName)

Public event Propert圜hangedEventHandler Propert圜hanged M_password2Property = new PassableProperty( M_password1Property = new PassableProperty( Public class MyViewModel : INotifyPropert圜hanged Public PassableProperty(Func getter, Action setter) Private void PasswordBox_Loaded(object sender, RoutedEventArgs e) Var property = passwordBox.Tag as PassableProperty If ((passwordBox != null) & (passwordBox.Tag != null)) Private void PasswordBox_PasswordChanged(object sender, RoutedEventArgs e) I've just been working on some code that involves multiple password boxes in one view, and I didn't want to end up wiring up lots of event handlers to cater for keeping the view and viewmodel in sync.