Customize UpdateSourceExceptionFilter : Exception « Windows Presentation Foundation « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows Presentation Foundation
3. Exception

<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">
    <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="textBox3" Width="50" FontSize="15"
             Validation.ErrorTemplate="{StaticResource validationTemplate}"
             Style="{StaticResource textBoxInError}">
            <TextBox.Text>
                <Binding Path="Age3" Source="{StaticResource ods}" UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <ExceptionValidationRule/>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

        <CheckBox Name="cb" Checked="UseCustomHandler" Unchecked="DisableCustomHandler">Enable Custom Handler (see ToolTip)</CheckBox>
    </StackPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Data;
using System.Globalization;
using System.Collections.ObjectModel;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        void UseCustomHandler(object sender, RoutedEventArgs e)
        {
            BindingExpression myBindingExpression = textBox3.GetBindingExpression(TextBox.TextProperty);
            Binding myBinding = myBindingExpression.ParentBinding;
            myBinding.UpdateSourceExceptionFilter = new UpdateSourceExceptionFilterCallback(ReturnExceptionHandler);
            myBindingExpression.UpdateSource();
        }

        void DisableCustomHandler(object sender, RoutedEventArgs e)
        {
            Binding myBinding = BindingOperations.GetBinding(textBox3, TextBox.TextProperty);
            myBinding.UpdateSourceExceptionFilter -= new UpdateSourceExceptionFilterCallback(ReturnExceptionHandler);
            BindingOperations.GetBindingExpression(textBox3, TextBox.TextProperty).UpdateSource();
        }

        object ReturnExceptionHandler(object bindingExpression, Exception exception)
        {
            return "This is from the UpdateSourceExceptionFilterCallBack.";
        }
    }
    public class AgeRangeRule : ValidationRule
    {
        private int _min;
        private int _max;

        public AgeRangeRule()
        {
        }

        public int Min
        {
            get { return _min; }
            set { _min = value; }
        }

        public int Max
        {
            get { return _max; }
            set { _max = value; }
        }

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            int age = 0;

            try
            {
                if (((string)value).Length > 0)
                    age = Int32.Parse((String)value);
            }
            catch (Exception e)
            {
                return new ValidationResult(false, "Illegal characters or " + e.Message);
            }

            if ((age < Min) || (age > Max))
            {
                return new ValidationResult(false,
                  "Please enter an age in the range: " + Min + " - " + Max + ".");
            }
            else
            {
                return new ValidationResult(true, null);
            }
        }
    }

    public class MyDataSource
    {
        private int _age;
        private int _age2;
        private int _age3;

        public MyDataSource()
        {
            Age = 0;
            Age2 = 0;
        }

        public int Age
        {
            get { return _age; }
            set { _age = value; }
        }
        public int Age2
        {
            get { return _age2; }
            set { _age2 = value; }
        }

        public int Age3
        {
            get { return _age3; }
            set { _age3 = value; }
        }
    }
}

24.128.Exception
	24.128.1.	Cross Thread Exception Raising
	24.128.2.	Cross Thread Exception Raising WorkerThread
	24.128.3.	Check Exception type for DispatcherUnhandledException
	24.128.4.	Raise exception from button click event
	24.128.5.	Security Exception
	24.128.6.	Throw Handled Exception
	24.128.7.	Throw Unhandled Exception
	24.128.8.	Throw Unhandled Exception From Thread
	24.128.9.	Customize UpdateSourceExceptionFilter
	24.128.10.	Manage unhandled exceptions that are thrown on secondary worker threads.
	24.128.11.	Throw Exception from button click action
	24.128.12.	Catch XamlParseException
	24.128.13.	Manage unhandled exceptions that are thrown on secondary user interface (UI) threads.