Can't make reference to Base Class method when assigning an event on View

Can't make reference to Base Class method when assigning an event on View

Some days ago I realized that in Silverlight, in order to always update the bindings on any texbox (in order to validate for error in each KeyPress) I needed this code on TextChanged Event event in every TextBox I had in the system:

TextBox txCtl = (TextBox)sender; if (txCtl != null) {     var be = txCtl.GetBindingExpression(TextBox.TextProperty);      if (be != null)     {         be.UpdateSource();     } } 

This code works pretty well (source: http://forums.silverlight.net/t/51100.aspx/1). The problem is: I don't want to repeat it in every view CodeBehind I have, so I decided to make a custom ViewBase where I would leave this code on it. What I did was simply:

public class ViewBase : ChildWindow {     protected void tboxTextChanged(object sender, TextChangedEventArgs e)     {         TextBox txCtl = (TextBox)sender; if (txCtl != null)         {             var be = txCtl.GetBindingExpression(TextBox.TextProperty);              if (be != null)             {                 be.UpdateSource();             }         }     } } 

And then my view now is a ViewBase, instead of a UserControl, so I also changed the XAML to:

<src:ViewBase x:Class="Oi.SCPOBU.Silverlight.Pages.CadastroClassificacao" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:src="clr-namespace:Oi.SCPOBU.Silverlight.Pages" [...] 

Finally, in my textbox I left the event referencing the same method as usual, but now the method is in ViewBase, istead of being in the CodeBehind:

<TextBox    x:Name="tbxNome"    Width="300"    MaxLength="50"    HorizontalAlignment="Left"    TextChanged="tboxTextChanged"    Text="{Binding DTOClassificacao.Nome, Mode=TwoWay, NotifyOnValidationError=True> 

Seems pretty straightforward to me, but this doesn't work. The code compiles, but in runtime I get the error: "Message=Failed to assign to property 'System.Windows.Controls.TextBox.TextChanged'. [Line: 43 Position: 37]", on the InitializeComponent() Method.

Anybody knows how can I assign a method from my base class to an event? Or will I really have to repeat this code in every single View I have?

Answers & Comments...

Answer: 1

in order to always update the bindings on any texbox (in order to validate for error in each KeyPress) I needed this code on TextChanged Event event in every TextBox I had in the system

Have you tried UpdateSourceTrigger.PropertyChanged?

<TextBox Text="{Binding Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/> 

by : Dennishttp://stackoverflow.com/users/580053

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