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Valdation Error system.Windows.Data Error: 4 ElementName=Holder

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Ramon asked on 28 Nov 2013, 11:43 AM

I used an entity with IEditableObject, IDataErrorInfo now when ever an error happens and the validation kicks in marking the controller with the red marker also this error is thrown, any ideas why, the proram runs fine but with this error am using Themes.Implicit copyed them into th project and refrenced the assemblies of Binaries.NoXaml

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Holder'. BindingExpression:(no path); DataItem=null; target element is 'ToolTip' (Name='PART_ToolTip'); target property is 'PlacementTarget' (type 'UIElement')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Holder'. BindingExpression:Path=AdornedElement.(0)[0].ErrorContent; DataItem=null; target element is 'ToolTip' (Name='PART_ToolTip'); target property is 'Content' (type 'Object')

thank you

7 Answers, 1 is accepted

answered on 02 Dec 2013, 04:08 PM

Hello Ramon,

Can you please elaborate a bit more on your scenario? If you can share with us the RadControls you're using along with their definitions, we will be able to further investigate the case. It would be also very helpful if you can isolate the issue in a small runnable project and send it to us so that we can try to reproduce the exceptions locally and investigate their origins.

Thank you in advance for your cooperation.

Regards,
Tina Stancheva
Telerik

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answered on 16 Dec 2013, 12:26 PM

Hi thank you for taking the time to reply, Here the user object with an IDataErrorInfo now if used with a textbox the error is thrown in output,  tried different impleminations of IDataErrorInfo but same error, also if the property is not required but has a StringLength attribute it will show up as error with

red marker  when not filled. 





error:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Holder'. BindingExpression:(no path); DataItem=null; target element is 'ToolTip' (Name='PART_ToolTip'); target property is 'PlacementTarget' (type 'UIElement')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Holder'. BindingExpression:Path=AdornedElement.(0)[0].ErrorContent; DataItem=null; target element is 'ToolTip' (Name='PART_ToolTip'); target property is 'Content' (type 'Object')









 




<StackPanel Grid.Row="0" Orientation="Vertical">
                    <Label Content="{lex:Loc Key=FirstName}" VerticalAlignment="Center" />
                    <DockPanel >
                        <TextBox Text="{Binding User.FirstName, Mode=TwoWay, 
                            ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"
                            FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"/>
                    </DockPanel>
                </StackPanel>






public class User : BaseEntity, IDataErrorInfo
  {
      #region Declarations
      private Guid _userId;
      private string _firstName;
      #endregion
  
      public Guid UserId
      {
          get { return _userId; }
          set { SetPropertyValue("UserId", ref _userId, value); }
      }
       
      public string FirstName
      {
          get { return _firstName; }
          set { SetPropertyValue("FirstName", ref _firstName, value); }
      }
       
     
  
  
      string IDataErrorInfo.Error { get { return null; } }
      string IDataErrorInfo.this[string propertyName]
      {
          get { return this.GetValidationError(propertyName); }
      }
      public bool IsValid{get{ return ValidatedProperties.All(property => GetValidationError(property) == null); }}    
      static readonly string[] ValidatedProperties =
      {
          "FirstName"
      };
  
      private string GetValidationError(string propertyName)
      {
          string error = null;
          switch (propertyName)
          {
              case "FirstName":
                  error = ValidateNames(FirstName, Lang.FirstName,3, 100);
                  break;          
  
          }
  
          return error;
      }
      private string ValidateNames(string name, string display, int min, int max)
      {
          if (String.IsNullOrWhiteSpace(name))
              return string.Format(Lang.Required, display);
  
          if (name.Length < min || name.Length > max)
              return string.Format(Lang.NumberLength, display, min, max);
  
          return null;
      }
 }

answered on 19 Dec 2013, 01:51 PM

Hello Ramon,

Thank you for getting back to us. I can see that you're using a TextBox and a native validation approach, rather than a RadControl. This is why I believe it would help you to post your question in a general WPF programming forum.

I found a few links that you might find helpful:

I hope these threads will help you move on.

Regards,
Tina Stancheva
Telerik

answered on 21 Dec 2013, 07:05 PM

hi
I have used Binaries.NoXaml and Themes.Implicit in the WPF Application

Telerik RadControls for WPF Q3 2013

The DataModel implements IDataErrorInfo tried different implementation and the error still shows up
Then even tried using INotifyDataErrorInfo the error still shows.

Using a a Textbox or a Telerik controller does not change a thing the error still shows.

<telerik:RadDatePicker SelectedDate="{Binding User.DateOfBirth, Mode=TwoWay, NotifyOnValidationError=True,
ValidatesOnDataErrors=True, ValidatesOnExceptions=True, UpdateSourceTrigger=PropertyChanged}"/>

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Holder'. BindingExpression:(no path); DataItem=null; target element is 'ToolTip' (Name='PART_ToolTip'); target property is 'PlacementTarget' (type 'UIElement')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=Holder'. BindingExpression:Path=AdornedElement.(0)[0].ErrorContent; DataItem=null; target element is 'ToolTip' (Name='PART_ToolTip'); target property is 'Content' (type 'Object')

If i change the style for validation the error goes away, so the error is in the Theme, not in the object.
Regards