WPF Validator as ajax/ Jquery

You can use wpf validator more smooth as ajax/ jquery. Just complete the following with me.

Step 1.

   Open A new Window in WPF

Step 2. Add a class Which will provide the Validation

   /************ StringAtikStringValidationRule ************/

using System.Globalization;
using System.Windows.Controls;

namespace WpfApplication4
{
   public class StringAtikStringValidationRule : ValidationRule
   {
   private int _minimumLength = -1;
   private int _maximumLength = -1;
   private string _errorMessage;

   public int MinimumLength
   {
   get { return _minimumLength; }
   set { _minimumLength = value; }
   }

   public int MaximumLength
   {
   get { return _maximumLength; }
   set { _maximumLength = value; }
   }

   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();
   if (inputString == null)
   {
   inputString = string.Empty;
   }

   if (inputString.Length < this.MinimumLength ||
   (this.MaximumLength > 0 &&
   inputString.Length > this.MaximumLength))
   {
   result = new ValidationResult(false, this.ErrorMessage);
   }
   return result;
   }
   }
}
   /********End Of the Class**********/

Step 3. Now add a class which will Show the Error Message

   /**************ErrorProvider ************/

using System.Collections.Generic;
using System.Windows.Controls;
using System.Windows;
using System.ComponentModel;
using System.Windows.Data;
using System.Reflection;

namespace WpfApplication4
{
   public class ErrorProvider : Decorator
   {
   private delegate void FoundBindingCallbackDelegate(FrameworkElement element, Binding binding, DependencyProperty dp);
   private FrameworkElement _firstInvalidElement;
   private Dictionary<DependencyObject, Style> _backupStyles = new Dictionary<DependencyObject, Style>();

   /// <summary>
   /// Constructor.
   /// </summary>
   public ErrorProvider()
   {
   this.DataContextChanged += new DependencyPropertyChangedEventHandler(ErrorProviderDataContextChanged);
   this.Loaded += new RoutedEventHandler(ErrorProviderLoaded);
   }

   /// <summary>
   /// Called when this component is loaded. We have a call to Validate here that way errors appear from the very
   /// moment the page or form is visible.
   /// </summary>
   private void ErrorProviderLoaded(object sender, RoutedEventArgs e)
   {
   Validate();
   }

   /// <summary>
   /// Called when our DataContext changes.
   /// </summary>
   private void ErrorProviderDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
   {
   if (e.OldValue != null && e.OldValue is INotifyPropertyChanged)
   {
   ((INotifyPropertyChanged)e.NewValue).PropertyChanged -= new PropertyChangedEventHandler(DataContextPropertyChanged);
   }

   if (e.NewValue != null && e.NewValue is INotifyPropertyChanged)
   {
   ((INotifyPropertyChanged)e.NewValue).PropertyChanged += new PropertyChangedEventHandler(DataContextPropertyChanged);
   }

   Validate();
   }

   /// <summary>
   /// Validates all properties on the current data source.
   /// </summary>
   /// <returns>True if there are no errors displayed, otherwise false.</returns>
   /// <remarks>
   /// Note that only errors on properties that are displayed are included. Other errors, such as errors for properties that are not displayed,
   /// will not be validated by this method.
   /// </remarks>
   public bool Validate()
   {
   bool isValid = true;
   _firstInvalidElement = null;

   if (this.DataContext is IDataErrorInfo)
   {
   List<Binding> allKnownBindings = ClearInternal();

   // Now show all errors
   foreach (Binding knownBinding in allKnownBindings)
   {
   string errorMessage = ((IDataErrorInfo)this.DataContext)[knownBinding.Path.Path];
   if (errorMessage != null && errorMessage.Length > 0)
   {
   isValid = false;

   // Display the error on any elements bound to the property
   FindBindingsRecursively(
   this.Parent,
   delegate(FrameworkElement element, Binding binding, DependencyProperty dp)
   {
   if (knownBinding.Path.Path == binding.Path.Path)
   {

   BindingExpression expression = element.GetBindingExpression(dp);
   ValidationError error = new ValidationError(new ExceptionValidationRule(), expression, errorMessage, null);
   System.Windows.Controls.Validation.MarkInvalid(expression, error);

   if (_firstInvalidElement == null)
   {
   _firstInvalidElement = element;
   }
   return;

   }
   });
   }
   }
   }
   return isValid;
   }

   /// <summary>
   /// Returns the first element that this error provider has labelled as invalid. This method
   /// is useful to set the users focus on the first visible error field on a page.
   /// </summary>
   /// <returns></returns>
   public FrameworkElement GetFirstInvalidElement()
   {
   return _firstInvalidElement;
   }

   /// <summary>
   /// Clears any error messages.
   /// </summary>
   public void Clear()
   {
   ClearInternal();
   }

   /// <summary>
   /// Clears any error messages and returns a list of all bindings on the current form/page. This is simply so
   /// it can be reused by the Validate method.
   /// </summary>
   /// <returns>A list of all known bindings.</returns>
   private List<Binding> ClearInternal()
   {
   // Clear all errors
   List<Binding> bindings = new List<Binding>();
   FindBindingsRecursively(
   this.Parent,
   delegate(FrameworkElement element, Binding binding, DependencyProperty dp)
   {
   // Remember this bound element. We'll use this to display error messages for each property.
   bindings.Add(binding);
   });
   return bindings;
   }

   /// <summary>
   /// Called when the PropertyChanged event is raised from the object we are bound to - that is, our data context.
   /// </summary>
   private void DataContextPropertyChanged(object sender, PropertyChangedEventArgs e)
   {
   if (e.PropertyName == "IsValid")
   {
   return;
   }
   Validate();
   }

   /// <summary>
   /// Recursively goes through the control tree, looking for bindings on the current data context.
   /// </summary>
   /// <param name="element">The root element to start searching at.</param>
   /// <param name="callbackDelegate">A delegate called when a binding if found.</param>
   private void FindBindingsRecursively(DependencyObject element, FoundBindingCallbackDelegate callbackDelegate)
   {

   // See if we should display the errors on this element
   MemberInfo[] members = element.GetType().GetMembers(BindingFlags.Static |
   BindingFlags.Public |
   BindingFlags.FlattenHierarchy);

   foreach (MemberInfo member in members)
   {
   DependencyProperty dp = null;

   // Check to see if the field or property we were given is a dependency property
   if (member.MemberType == MemberTypes.Field)
   {
   FieldInfo field = (FieldInfo)member;
   if (typeof(DependencyProperty).IsAssignableFrom(field.FieldType))
   {
   dp = (DependencyProperty)field.GetValue(element);
   }
   }
   else if (member.MemberType == MemberTypes.Property)
   {
   PropertyInfo prop = (PropertyInfo)member;
   if (typeof(DependencyProperty).IsAssignableFrom(prop.PropertyType))
   {
   dp = (DependencyProperty)prop.GetValue(element, null);
   }
   }

   if (dp != null)
   {
   // Awesome, we have a dependency property. does it have a binding? If yes, is it bound to the property we're interested in?
   Binding bb = BindingOperations.GetBinding(element, dp);
   if (bb != null)
   {
   // This element has a DependencyProperty that we know of that is bound to the property we're interested in.
   // Now we just tell the callback and the caller will handle it.
   if (element is FrameworkElement)
   {
   if (((FrameworkElement)element).DataContext == this.DataContext)
   {
   callbackDelegate((FrameworkElement)element, bb, dp);
   }
   }
   }
   }
   }

   // Now, recurse through any child elements
   if (element is FrameworkElement || element is FrameworkContentElement)
   {
   foreach (object childElement in LogicalTreeHelper.GetChildren(element))
   {
   if (childElement is DependencyObject)
   {
   FindBindingsRecursively((DependencyObject)childElement, callbackDelegate);
   }
   }
   }
   }
   }
}

/*********** End Of The Error Provider Class*************/

Step.4 Now add the XAML code in App.xaml in application Resource Which will take effect On Every Page.

/****************** App.XAML ********************/

<Application.Resources>

<Setter.Value>

<TextBlock DockPanel.Dock="Right"

Foreground="Orange"

Margin="5"

FontSize="12pt"

Text="{Binding ElementName=MyAdorner,

Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">

</TextBlock>

</Border>

</DockPanel>

</ControlTemplate>

</Setter.Value>

</Setter>

<Style.Triggers>

<Setter Property="ToolTip"

Value="{Binding RelativeSource={RelativeSource Self},

Path=(Validation.Errors)[0].ErrorContent}"/>

</Trigger>

</Style.Triggers>

</Style>

</Application.Resources>

/****************End Of App XAML***************/

step 5. Now customise your UI Field which you want to set validate. Consider a text Box then xaml will be

/************* Text box xaml*************/

<TextBox.Text>

<Binding.ValidationRules>

<local:StringAtikStringValidationRule MinimumLength="1" MaximumLength="30"

ErrorMessage="Name is required." />

</Binding.ValidationRules>

</Binding>

</TextBox.Text>

</TextBox>

</StackPanel>

/*********** End Of xaml Stack***************/

Step 6. create a class in which aspect you bind the text field consider customer class.

/************ Customer Class ************/

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace WpfApplication4

{

public class Customer

{

private string name;

public string Name

{

get { return name; }

set { name = value; }

}

/********** End Of Customer Class**********/

step 7. Now declare the class at the initially of your UI.

/***************** Initial in UI *****************/

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

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.Shapes;

namespace WpfApplication4

{

/// <summary>

/// Interaction logic for Window1.xaml

/// </summary>

public partial class Window1 : Window

{

public Window1()

{

Customer c = new Customer();

InitializeComponent();

this.DataContext = c;

}

/******************* End of initialization UI *********************/

Enjoy.................

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