BindingValidationError not raising on my system in foll... RSS

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  nikhilthaker

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  BindingValidationError not raising on my system in following code ?

  Jun 03, 2009 05:10 AM | LINK

  Strange thing about this issue is it's working on one system but not on my system.

  Infact when I have copied the code from another system, it was working fine for 3-4 attemps but suddenly it had stopped working without any changes during that time. 

  May be some problem with event bubbling but i have tried raising error on validation element as well but that also not woking.

  Do we need to configure any setting to raise validations?

   

  MainPage.xaml code as follows

  <UserControl
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" x:Class="DataBindingAndValidationInSL3.MainPage"
      Width="400" Height="300" mc:Ignorable="d">
      <Grid x:Name="LayoutRoot" Background="#FF8BB4D0" BindingValidationError="LayoutRoot_BindingValidationError">
          <StackPanel Orientation="Vertical">
              <TextBlock x:Name="tbkNumber" Height="25" HorizontalAlignment="Left" Margin="50,8,0,0"
                     VerticalAlignment="Top" Width="60" Text="Number" TextWrapping="Wrap"/>
              <TextBox x:Name="txtNumber" Height="25" Margin="125,8,74,0" VerticalAlignment="Top"
                   Text="{Binding Path=Number, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true }"
                   TextWrapping="Wrap" Width="200" BindingValidationError="txtNumber_BindingValidationError"/>
              <Button x:Name="btnSubmit" Content="OK" Height="30" Width="50"></Button>
          </StackPanel>
      </Grid>

  </UserControl>

   

  MainPage.xaml.cs code as follows

   public partial class MainPage : UserControl
      {
          public MainPage()
          {
              InitializeComponent();

              this.BindingValidationError += new EventHandler<ValidationErrorEventArgs>(MainPage_BindingValidationError);
             
              MyData d = new MyData();
              d.Number = 4;
              this.DataContext = d;
          }

      

          void MainPage_BindingValidationError(object sender, ValidationErrorEventArgs e)
          {
              if (e.Error != null)
              {
                 //Control control =    e.OriginalSource as Control;
                 //control.BorderThickness = new Thickness(5);
                 //control.BorderBrush = new SolidColorBrush(Colors.Red);
              }
          }

       } 

  and MyData.cs code as follows

  public class MyData
      {
          private int number;
          public int Number
          {
              get
              {
                  return number;
              }
              set
              {
                  if (String.Empty.Equals(value))
                  {
                      number = 1;
                  }
                  else
                  {
                      int num = Convert.ToInt32(value);
                      if ((num < 1) || (num > 5))
                      {
                          throw new ArgumentException("Number must be between 1 and 5");
                      }
                      number = value;
                  }
              }
          }

      }

   

  Validation DataBinding Silverlight 3 Beta BindingValidationError event events BindingValidationError DataBinding and Validation event bubbling

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  Mog Liang -...

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  Re: BindingValidationError not raising on my system in following code ?

  Jun 08, 2009 04:49 AM | LINK

  TextBox will trigger Binding Validate operation when it lost focus, but in your code it works not stably.

  you could trigger textbox's validate manually. 

  XAML

              <TextBox x:Name="txtNumber" Height="25" Margin="125,8,74,0" VerticalAlignment="Top" 
                   Text="{Binding Path=Number, Mode=TwoWay, ValidatesOnExceptions=true,  UpdateSourceTrigger=Explicit}"
                   TextWrapping="Wrap" Width="200"/>
              <Button x:Name="btnSubmit" Content="OK" Height="30" Width="50" Click="btnSubmit_Click_1"></Button>

  Code  

          private void btnSubmit_Click_1(object sender, RoutedEventArgs e)
          {
              //when click button, trigger textbox's validate action
              BindingExpression be = txtNumber.GetBindingExpression(TextBox.TextProperty);
              be.UpdateSource();
          }

  some useful article and thread

  http://www.silverlightshow.net/items/Data-Validation-in-Silverlight-3.aspx

  http://silverlight.net/forums/t/83833.aspx

  Mog Liang
  Microsoft Online Community Support
  
  Please remember to mark the replies as answers if they help and unmark them if they provide no help.
  
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  dhavalmania27

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  Re: Re: BindingValidationError not raising on my system in following code ?

  Aug 25, 2009 12:08 PM | LINK

   Hi,

  I am trying to validate the text box only when i have checkbox checked. If the checkbox is unchecked i dont want to validate the textbox and it should not give the validation error. and if its checked then it should validate it.

   

  i have written the following code..

   

  
  

  
  

   

   
  <CheckBox x:Name="AbsoluteThresholdCheckbox" Content="Absolute Threshold" Height="50" />
  <TextBox Width="100" Height="25" 
  	IsEnabled="{Binding IsChecked, ElementName=AbsoluteThresholdCheckbox}" 
          x:Name="absoluteUpperLimitText" >
  		<TextBox.Text>
                  	<Binding Path="UpperLimitAbsoluteThreshold" Mode="TwoWay" 
                          NotifyOnValidationError="{Binding IsChecked, ElementName=AbsoluteThresholdCheckbox}" 
                          ValidatesOnExceptions="True"></Binding>
  		</TextBox.Text>
  	</TextBox>
       
  

   
  
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  mtiede@swtec...

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  Re: Re: BindingValidationError not raising on my system in following code ?

  Sep 01, 2009 01:35 PM | LINK

   Maybe try making the binding on the NotifyOnValidationError Mode=TwoWay?  Just a guess.