Disable button in WPF

Question

I have a Button and a TextBox in my WPF app  How can I make the Button not enabled until the user enters some text in the TextBox

User · Answer

In MVVM  wich makes a lot of things a lot easier - you should try it  you would have two properties in your ViewModel Text that is bound to your TextBox and you would have an ICommand property Apply  or similar  that is bound to the button   lt Button Command  quot Apply quot  gt Apply lt  Button gt   The ICommand interface has a Method CanExecute that is where you return true if   string IsNullOrWhiteSpace this Text   The rest is done by WPF for you  enabling disabling  executing the actual command on click   The linked article explains it in detail

User · Answer

I know this isn t as elegant as the other posts  but it s a more straightforward xaml codebehind example of how to accomplish the same thing   Xaml    lt StackPanel Orientation  Horizontal  gt      lt TextBox Name  TextBox01  VerticalAlignment  Top  HorizontalAlignment  Left  Width  70    gt      lt Button Name  Button01  VerticalAlignment  Top  HorizontalAlignment  Left  Margin  10 0 0 0    gt   lt  StackPanel gt    CodeBehind   Private Sub Window1 Loaded ByVal sender As Object  ByVal e As System Windows RoutedEventArgs  Handles Me Loaded          Button01 IsEnabled   False         Button01 Content    I am Disabled   End Sub  Private Sub TextBox01 TextChanged ByVal sender As Object  ByVal e As System Windows Controls TextChangedEventArgs  Handles TextBox01 TextChanged          If TextBox01 Text Trim Length  gt  0 Then             Button01 IsEnabled   True             Button01 Content    I am Enabled          Else             Button01 IsEnabled   False             Button01 Content    I am Disabled          End If  End Sub

User · Answer

You could subscribe to the TextChanged event on the TextBox and if the text is empty set the Button to disabled  Or you could bind the Button IsEnabled property to the TextBox Text property and use a converter that returns true if there is any text and false otherwise

User · Answer

This should do it    lt StackPanel gt       lt TextBox x Name  TheTextBox    gt       lt Button Content  Click Me  gt           lt Button Style gt               lt Style TargetType  Button  gt                   lt Setter Property  IsEnabled  Value  True    gt                   lt Style Triggers gt                       lt DataTrigger Binding   Binding Text  ElementName TheTextBox   Value    gt                           lt Setter Property  IsEnabled  Value  False    gt                       lt  DataTrigger gt                   lt  Style Triggers gt               lt  Style gt           lt  Button Style gt       lt  Button gt   lt  StackPanel gt

User · Answer

By code   btn edit IsEnabled   true    By XAML    lt Button Content  Edit data  Grid Column  1  Name  btn edit  Grid Row  1  IsEnabled  False    gt

[wpf] Disable button in WPF?

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