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POValidate textbox in c# with wpf
 

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  1. POValidate textbox in c# with wpf
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    <p>I have a window with some textboxes, comboxes and checkboxes. One of the textboxes need to be a number so I wanted to validate it. I searched through the internet and found a good <a href="http://www.codeproject.com/Articles/15239/Validation-in-Windows-Presentation-Foundation" rel="nofollow">tutorial</a>. I tried to use it, but it seems that it doesn't work or I did something wrong and I just don't see what I did wrong. So I hope anyone here can say me what I'm doing wrong or an other solution to get it started. Here is the xaml of the window:</p> <pre><code>&lt;Window x:Class="WpfApplication1.mainpanels.EditWorkAssignments" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:validators="clr-namespace:WpfApplication1.validationRules" Title="EditWorkAssignments" Height="225" Width="300"&gt; &lt;Window.Resources&gt; &lt;Style TargetType="{x:Type TextBox}"&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Validation.HasError" Value="true"&gt; &lt;Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;ColumnDefinition Width="200" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Label Grid.Row="0" Grid.Column="0" Content="Datum:"/&gt; &lt;Label Grid.Row="1" Grid.Column="0" Content="Projekt:"/&gt; &lt;Label Grid.Row="2" Grid.Column="0" Content="Ist Passiv:"/&gt; &lt;Label Grid.Row="3" Grid.Column="0" Content="Dauer:"/&gt; &lt;Label Grid.Row="4" Grid.Column="0" Content="Mitarbeiter:"/&gt; &lt;DatePicker Name="datePicker" Grid.Column="1" Grid.Row="0" Margin="3" /&gt; &lt;ComboBox Name="comboBoxProject" Grid.Column="1" Grid.Row="1" Margin="3" /&gt; &lt;CheckBox Name="checkBoxIsPassiv" Grid.Column="1" Grid.Row="2" Margin="3" /&gt; &lt;TextBox Name="textBoxDauer" Grid.Column="1" Grid.Row="3" Margin="3" &gt; &lt;Binding Path="workAssignment.duration" UpdateSourceTrigger="PropertyChanged"&gt; &lt;Binding.ValidationRules&gt; &lt;validators:IsNumberValidationRule ErrorMessage="Dauer has to be a number." /&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/TextBox&gt; &lt;ComboBox Name="comboBoxEmployee" Grid.Column="1" Grid.Row="4" Margin="3"&gt; &lt;ComboBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock&gt; &lt;TextBlock.Text&gt; &lt;MultiBinding StringFormat="{}{0} {1}"&gt; &lt;Binding Path="firstname"/&gt; &lt;Binding Path="surname"/&gt; &lt;/MultiBinding&gt; &lt;/TextBlock.Text&gt; &lt;/TextBlock&gt; &lt;/DataTemplate&gt; &lt;/ComboBox.ItemTemplate&gt; &lt;/ComboBox&gt; &lt;Button Grid.Column="1" Grid.Row="5" HorizontalAlignment="Left" MinWidth="80" Margin="3" Content="Save" Click="saveHandler"/&gt; &lt;Button Grid.Column="1" Grid.Row="5" HorizontalAlignment="Right" MinWidth="80" Margin="3" Content="Cancel" Click="cancelHandler" /&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>the code:</p> <pre><code>using System; using System.Collections.Generic; using System.Data.Entity; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; namespace WpfApplication1.mainpanels { /// &lt;summary&gt; /// Interaction logic for EditWorkAssignments.xaml /// &lt;/summary&gt; public partial class EditWorkAssignments : Window { EmployeeManagementEntities1 context = null; public WorkAssignement workAssignment; public EditWorkAssignments(WorkAssignement workAssignment) { InitializeComponent(); this.workAssignment = workAssignment; context = new EmployeeManagementEntities1(); DbSet&lt;Employee&gt; employeeDb = context.Set&lt;Employee&gt;(); employeeDb.Load(); comboBoxEmployee.ItemsSource = employeeDb.Local; DbSet&lt;Project&gt; projectDb = context.Set&lt;Project&gt;(); projectDb.Load(); comboBoxProject.ItemsSource = projectDb.Local; comboBoxProject.DisplayMemberPath = "projectname"; } private void saveHandler(object sender, RoutedEventArgs e) { Employee employee = (Employee)comboBoxEmployee.SelectedItem; Project project = (Project)comboBoxProject.SelectedItem; context.SaveChanges(); Console.WriteLine("saveHandler"); } private void cancelHandler(object sender, RoutedEventArgs e) { this.Close(); Console.WriteLine("cancelHandler"); } } } </code></pre> <p>and the validationRule:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Controls; using System.Globalization; using System.Text.RegularExpressions; namespace WpfApplication1.validationRules { public class IsNumberValidationRule : ValidationRule { private string _errorMessage; public string ErrorMessage { get { return _errorMessage; } set { _errorMessage = value; } } public override ValidationResult Validate(object value, CultureInfo cultureInfo) { ValidationResult result = new ValidationResult(true, null); string inputString = (value ?? string.Empty).ToString(); try { double.Parse(inputString); } catch(FormatException ex) { result = new ValidationResult(false, this.ErrorMessage); } return result; } } } </code></pre>
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    1. USSarajog
    1. USSarajog
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    1. COerror pls can you put
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      1. UStechloverr
    2. COthere are no errors, it just doesn't show the error message when I enter "addfztg" in the textbox that only should contain numbers and there no red border either
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      1. USSarajog
    3. COSo ur code not working? Its looks fine. Any error or exception?
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      1. USAnkush Madankar
 

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