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| Use Dictionary to record which textbox has been changed and not saved |
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<Window x:Class="Commands.TwoDocument"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="TwoDocument" Height="300" Width="300">
<Window.Resources>
<CommandBinding x:Key="binding" Command="ApplicationCommands.Save" Executed="SaveCommand" CanExecute="SaveCommand_CanExecute" />
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Menu Grid.Row="0">
<MenuItem Header="File">
<MenuItem Command="New"></MenuItem>
<MenuItem Command="Open"></MenuItem>
<MenuItem Command="Save"></MenuItem>
<MenuItem Command="SaveAs"></MenuItem>
<Separator></Separator>
<MenuItem Command="Close"></MenuItem>
</MenuItem>
</Menu>
<TextBox Margin="5" Grid.Row="2" TextWrapping="Wrap" AcceptsReturn="True" TextChanged="txt_TextChanged">
<TextBox.CommandBindings>
<StaticResource ResourceKey="binding"></StaticResource>
</TextBox.CommandBindings>
</TextBox>
</Grid>
</Window>
//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes
Namespace Commands
Public Partial Class TwoDocument
Inherits System.Windows.Window
Private isDirty As New Dictionary(Of [Object], Boolean)()
Public Sub New()
InitializeComponent()
End Sub
Private Sub SaveCommand(sender As Object, e As ExecutedRoutedEventArgs)
Dim text As String = DirectCast(sender, TextBox).Text
isDirty(sender) = False
End Sub
Private Sub txt_TextChanged(sender As Object, e As RoutedEventArgs)
isDirty(sender) = True
End Sub
Private Sub SaveCommand_CanExecute(sender As Object, e As CanExecuteRoutedEventArgs)
If isDirty.ContainsKey(sender) AndAlso isDirty(sender) = True Then
e.CanExecute = True
Else
e.CanExecute = False
End If
End Sub
End Class
End Namespace
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| Related examples in the same category |
| 1. | You cannot use TextBox and Image at the same time for Button Content | | | | 2. | Single line and Multiline TextBox | |  | | 3. | TextBox Column | |  | | 4. | Bind value to TextBox | |  | | 5. | Provide Keyboard Access to Text Boxes | |  | | 6. | An upside down TextBox | |  | | 7. | Style with Data Trigger for TextBox | |  | | 8. | TextBox with custom ErrorTemplate and ToolTip | |  | | 9. | TextBox uses the ExceptionValidationRule and UpdateSourceExceptionFilter handler | |  | | 10. | TextBox with UpdateSourceExceptionFilter handler | |  | | 11. | TextBox focus listener | |  | | 12. | TextBox MouseLeftButtonDown action and PreviewMouseLeftButtonDown action | |  | | 13. | Mark the text control as being changed to prevent any text content or selection changed events | |  | | 14. | Listen to TextBox text changed event | |  | | 15. | Handler for the PreviewKeyDown event on the TextBox | |  | | 16. | Format TextBox with MenuItem: normal, bold, italic | |  | | 17. | TextBox: set text, select all, clear, prepend, insert, append, cut, paste, undo | |  | | 18. | Set TextBox to editable | |  | | 19. | TextBox PreviewTextInput | |  | | 20. | Scroll TextBox | |  | | 21. | TextBox text changed event | |  | | 22. | TextBox TextChanged event | | | | 23. | Use TextBox.CommandBindingst to bind command | |  | | 24. | Set TextBox ContextMenu to null | |  | | 25. | TextBox Selection start, end and selected text | |  | | 26. | Scrollable TextBox Column | |  | | 27. | Check Spelling Error | |  |
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