TextBox with custom ErrorTemplate and ToolTip : TextBox « Windows Presentation Foundation « VB.Net

Home VB.Net 1. 2D 2. Application 3. Class 4. Data Structure 5. Database ADO.net 6. Development 7. Event 8. File Directory 9. Generics 10. GUI 11. Language Basics 12. LINQ 13. Network Remote 14. Thread 15. Windows Presentation Foundation 16. Windows System 17. XML 18. XML LINQ VB.Net Tutorial VB.Net by API

VB.Net » Windows Presentation Foundation » TextBox Screenshots  TextBox with custom ErrorTemplate and ToolTip     <Window   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   xmlns:c="clr-namespace:WpfApplication1"   x:Class="WpfApplication1.Window1"   Title="Binding Validation Sample"   SizeToContent="WidthAndHeight"   ResizeMode="NoResize">     <Window.Resources>         <c:MyDataSource x:Key="ods"/>         <ControlTemplate x:Key="validationTemplate">             <DockPanel>                 <TextBlock Foreground="Red" FontSize="20">!</TextBlock>                 <AdornedElementPlaceholder/>             </DockPanel>         </ControlTemplate>         <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}">             <Style.Triggers>                 <Trigger Property="Validation.HasError" Value="true">                     <Setter Property="ToolTip"               Value="{Binding RelativeSource={x:Static RelativeSource.Self},Path=(Validation.Errors)[0].ErrorContent}"/>                 </Trigger>             </Style.Triggers>         </Style>     </Window.Resources>     <StackPanel>         <TextBox Name="textBox1" Width="50" Validation.ErrorTemplate="{StaticResource validationTemplate}"              Style="{StaticResource textBoxInError}">             <TextBox.Text>                 <Binding Path="Age" Source="{StaticResource ods}"                  UpdateSourceTrigger="PropertyChanged" >                     <Binding.ValidationRules>                         <c:AgeRangeRule Min="21" Max="30"/>                     </Binding.ValidationRules>                 </Binding>             </TextBox.Text>         </TextBox>     </StackPanel> </Window> //File:Window.xaml.vb Imports System Imports System.ComponentModel Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Documents Imports System.Windows.Navigation Imports System.Windows.Shapes Imports System.Windows.Data Imports System.Globalization Imports System.Collections.ObjectModel Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()     End Sub     Private Function ReturnExceptionHandler(bindingExpression As Object, exception As Exception) As Object       Return "This is from the UpdateSourceExceptionFilterCallBack."     End Function   End Class   Public Class AgeRangeRule     Inherits ValidationRule     Private _min As Integer     Private _max As Integer     Public Sub New()     End Sub     Public Property Min() As Integer       Get         Return _min       End Get       Set         _min = value       End Set     End Property     Public Property Max() As Integer       Get         Return _max       End Get       Set         _max = value       End Set     End Property     Public Overrides Function Validate(value As Object, cultureInfo As CultureInfo) As ValidationResult       Dim age As Integer = 0       Try         If DirectCast(value, String).Length > 0 Then           age = Int32.Parse(DirectCast(value, [String]))         End If       Catch e As Exception         Return New ValidationResult(False, "Illegal characters or " & e.Message)       End Try       If (age < Min) OrElse (age > Max) Then         Return New ValidationResult(False, "Please enter an age in the range: " & Min & " - " & Max & ".")       Else         Return New ValidationResult(True, Nothing)       End If     End Function   End Class   Public Class MyDataSource     Private _age As Integer     Private _age2 As Integer     Private _age3 As Integer     Public Sub New()       Age = 0       Age2 = 0     End Sub     Public Property Age() As Integer       Get         Return _age       End Get       Set         _age = value       End Set     End Property     Public Property Age2() As Integer       Get         Return _age2       End Get       Set         _age2 = value       End Set     End Property     Public Property Age3() As Integer       Get         Return _age3       End Get       Set         _age3 = value       End Set     End Property   End Class End Namespace                  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 uses the ExceptionValidationRule and UpdateSourceExceptionFilter handler 9. TextBox with UpdateSourceExceptionFilter handler 10. TextBox focus listener 11. TextBox MouseLeftButtonDown action and PreviewMouseLeftButtonDown action 12. Mark the text control as being changed to prevent any text content or selection changed events 13. Listen to TextBox text changed event 14. Handler for the PreviewKeyDown event on the TextBox 15. Format TextBox with MenuItem: normal, bold, italic 16. TextBox: set text, select all, clear, prepend, insert, append, cut, paste, undo 17. Set TextBox to editable 18. TextBox PreviewTextInput 19. Scroll TextBox 20. TextBox text changed event 21. TextBox TextChanged event 22. Use TextBox.CommandBindingst to bind command 23. Use Dictionary to record which textbox has been changed and not saved 24. Set TextBox ContextMenu to null 25. TextBox Selection start, end and selected text 26. Scrollable TextBox Column 27. Check Spelling Error