Providing binding-level validation

The following example demonstrates how to create a custom ValidationRule and apply it to a column's binding to provide binding-level validation.

The implementation for the YearValidationRule is provided below.

XAML	Copy Code
<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid" xmlns:local="clr-namespace:Xceed.Wpf.Documentation"> <Grid.Resources> <xcdg:DataGridCollectionViewSource x:Key="cvs_composers" Source="{Binding Source={x:Static Application.Current}, Path=Composers}"/> </Grid.Resources> <xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource cvs_composers}}" UpdateSourceTrigger="RowEndingEdit"> <xcdg:DataGridControl.Columns> <xcdg:Column FieldName="BirthYear"> <xcdg:Column.DisplayMemberBindingInfo> <xcdg:DataGridBindingInfo Path="BirthYear"> <xcdg:DataGridBindingInfo.ValidationRules> <local:YearValidationRule /> </xcdg:DataGridBindingInfo.ValidationRules> </xcdg:DataGridBindingInfo> </xcdg:Column.DisplayMemberBindingInfo> </xcdg:Column> <xcdg:Column FieldName="DeathYear"> <xcdg:Column.DisplayMemberBindingInfo> <xcdg:DataGridBindingInfo Path="DeathYear"> <xcdg:DataGridBindingInfo.ValidationRules> <local:YearValidationRule /> </xcdg:DataGridBindingInfo.ValidationRules> </xcdg:DataGridBindingInfo> </xcdg:Column.DisplayMemberBindingInfo> </xcdg:Column> </xcdg:DataGridControl.Columns> </xcdg:DataGridControl> </Grid>

XAML

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<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"
     xmlns:local="clr-namespace:Xceed.Wpf.Documentation">
  <Grid.Resources>
     <xcdg:DataGridCollectionViewSource x:Key="cvs_composers"
                                        Source="{Binding Source={x:Static Application.Current},
                                                         Path=Composers}"/>
  </Grid.Resources>
 
  <xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource cvs_composers}}"
                        UpdateSourceTrigger="RowEndingEdit">
     <xcdg:DataGridControl.Columns>
       <xcdg:Column FieldName="BirthYear">
          <xcdg:Column.DisplayMemberBindingInfo>
             <xcdg:DataGridBindingInfo Path="BirthYear">
                <xcdg:DataGridBindingInfo.ValidationRules>
                   <local:YearValidationRule />
                </xcdg:DataGridBindingInfo.ValidationRules>
             </xcdg:DataGridBindingInfo>
          </xcdg:Column.DisplayMemberBindingInfo>
       </xcdg:Column>
       <xcdg:Column FieldName="DeathYear">
          <xcdg:Column.DisplayMemberBindingInfo>
             <xcdg:DataGridBindingInfo Path="DeathYear">
                <xcdg:DataGridBindingInfo.ValidationRules>
                   <local:YearValidationRule />
                </xcdg:DataGridBindingInfo.ValidationRules>
             </xcdg:DataGridBindingInfo>
          </xcdg:Column.DisplayMemberBindingInfo>
       </xcdg:Column>     
    </xcdg:DataGridControl.Columns>
  </xcdg:DataGridControl>
</Grid>

Implementation of the YearValidationRule validation rule.

VB.NET	Copy Code
Imports System Imports System.Windows.Controls Imports System.Globalization Namespace Xceed.Wpf.Documentation Public Class YearValidationRule Inherits ValidationRule Public Overrides Function Validate( ByVal value As Object, _ ByVal cultureInfo As CultureInfo ) As ValidationResult Dim year As Integer = CInt( value ) If year > DateTime.Now.Year Then Return New ValidationResult( False, "Chosen year cannot be greater than this year." ) End If Return ValidationResult.ValidResult End Function End Class End Namespace

VB.NET

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Imports System
Imports System.Windows.Controls
Imports System.Globalization
Namespace Xceed.Wpf.Documentation
  Public Class YearValidationRule
               Inherits ValidationRule
    Public Overrides Function Validate( ByVal value As Object, _
                                        ByVal cultureInfo As CultureInfo ) As ValidationResult
      Dim year As Integer = CInt( value )
      If year > DateTime.Now.Year Then
        Return New ValidationResult( False, "Chosen year cannot be greater than this year." )
      End If
      Return ValidationResult.ValidResult
    End Function
  End Class
End Namespace

C#	Copy Code
using System; using System.Windows.Controls; using System.Globalization; namespace Xceed.Wpf.Documentation { public class YearValidationRule : ValidationRule { public override ValidationResult Validate( object value, CultureInfo cultureInfo ) { int year = ( int )value; if( year > DateTime.Now.Year ) return new ValidationResult( false, "Chosen year cannot be greater than this year." ); return ValidationResult.ValidResult; } } }

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using System;
using System.Windows.Controls;
using System.Globalization;
namespace Xceed.Wpf.Documentation
{
 public class YearValidationRule : ValidationRule
 {
   public override ValidationResult Validate( object value, CultureInfo cultureInfo )
   {
     int year = ( int )value;
     if( year > DateTime.Now.Year )
       return new ValidationResult( false, "Chosen year cannot be greater than this year." );
     return ValidationResult.ValidResult;
   }
 }
}