Bind to IDataErrorInfo : Binding « Windows Presentation Foundation « C# / CSharp Tutorial






<Window
    x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="136" Width="260">

    <Window.Resources>
        <Style 
            x:Key="textBoxInErrorStyle" 
            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>
            <Setter Property="Validation.ErrorTemplate">
                <Setter.Value>
                    <ControlTemplate>
                        <DockPanel DockPanel.Dock="Right">
                            <AdornedElementPlaceholder/>
                            <Image Source="Error.png" Width="16" Height="16" ToolTip="{Binding Path=AdornedElement.ToolTip, 
                                         RelativeSource={RelativeSource 
                                            Mode=FindAncestor,
                                            AncestorType={x:Type Adorner}}}"/>
                        </DockPanel>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </Window.Resources>

    <StackPanel>
        <TextBlock Text="First Name"/>
        <TextBox Style="{StaticResource textBoxInErrorStyle}" Text="{Binding Path=FirstName, Mode=TwoWay,
                           UpdateSourceTrigger=PropertyChanged,
                           ValidatesOnDataErrors=True}" />
        
        <TextBlock Text="Age" Grid.Row="2" VerticalAlignment="Center"/>
        <TextBox Style="{StaticResource textBoxInErrorStyle}"
            Margin="4" Text="{Binding Path=Age, Mode=TwoWay,        
                           UpdateSourceTrigger=PropertyChanged,
                           ValidatesOnDataErrors=True}"/>
        
    </StackPanel>
</Window>
//File:Window.xaml.cs
using System.Windows;
using System.ComponentModel;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            this.DataContext = new Employee(){FirstName = "A",Age = 26,};
        }
    }

    public class Employee : INotifyPropertyChanged,IDataErrorInfo
    {
        private string firstName;
        private int age;

        public Employee()
        {
            FirstName = "A";
        }
        public string FirstName
        {
            get
            {
                return firstName;
            }
            set
            {
                if(firstName != value)
                {
                    firstName = value;
                    OnPropertyChanged("FirstName");
                }
            }
        }

        public int Age
        {
            get
            {
                return age;
            }
            set
            {
                if(this.age != value)
                {
                    this.age = value;
                    OnPropertyChanged("Age");
                }
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void OnPropertyChanged(string propertyName){
            if(this.PropertyChanged != null)
            {
                this.PropertyChanged(this,new PropertyChangedEventArgs(propertyName));
            }
        }
        public string Error
        {
            get
            {
                return string.Empty;
            }
        }

        public string this[string propertyName]
        {
            get
            {
                string message = string.Empty;

                switch(propertyName)
                {
                    case "FirstName":
                        if(string.IsNullOrEmpty(firstName))
                            message = "A person must have a first name.";
                        break;

                    case "Age":
                        if(age < 1)
                            message = "A person must have an age.";
                        break;

                    default:
                        break;
                }

                return message;
            }
        }
    }
}
WPF Bind To I Data Error Info








24.129.Binding
24.129.1.Bind to Window itselfBind to Window itself
24.129.2.Two level path bindingTwo level path binding
24.129.3.Bind RelativeSource's AncestorTypeBind RelativeSource's AncestorType
24.129.4.Bind RelativeSource's AncestorType's PathBind RelativeSource's AncestorType's Path
24.129.5.Bind Stroke Thickness to SliderBind Stroke Thickness to Slider
24.129.6.Desktop to ControlDesktop to Control
24.129.7.Binding With Data ContextBinding With Data Context
24.129.8.Long Binding PathLong Binding Path
24.129.9.Bind ListBox ItemsSource to DayNames property of DateTimeFormatInfoBind ListBox ItemsSource to DayNames property of DateTimeFormatInfo
24.129.10.Bind TextBlock Text to SelectedItem property of ListBoxBind TextBlock Text to SelectedItem property of ListBox
24.129.11.Binding FontFamily / FontSize value for current ControlBinding FontFamily / FontSize value for current Control
24.129.12.Bind to IDataErrorInfoBind to IDataErrorInfo
24.129.13.DataTemplate for bindingDataTemplate for binding
24.129.14.Binding Environment InfoBinding Environment Info
24.129.15.Bind to an ADO.NETDataSetBind to an ADO.NETDataSet
24.129.16.Add a value converter to a binding using XAMLAdd a value converter to a binding using XAML
24.129.17.Custom Dialog with data bindingCustom Dialog with data binding
24.129.18.One way and two way bindingOne way and two way binding
24.129.19.Object BindingObject Binding
24.129.20.Without BindingWithout Binding
24.129.21.Master Detail BindingMaster Detail Binding
24.129.22.Data binding using collections composed of mixed types of data.Data binding using collections composed of mixed types of data.
24.129.23.List BindingList Binding
24.129.24.Async bindingAsync binding
24.129.25.Hierarchical Binding for three level nested objectsHierarchical Binding for three level nested objects
24.129.26.BindingOperations.GetBindingExpressionBindingOperations.GetBindingExpression
24.129.27.Bind to enum typesBind to enum types
24.129.28.Bind to a MethodBind to a Method
24.129.29.Bind an ItemsControl to the CollectionViewSource, Set its DisplayMemberPath to display the Name propertyBind an ItemsControl to the CollectionViewSource, Set its DisplayMemberPath to display the Name property
24.129.30.Bind to the Values of an EnumerationBind to the Values of an Enumeration
24.129.31.Bind to an Existing Object InstanceBind to an Existing Object Instance
24.129.32.Digital ClockDigital Clock
24.129.33.Formatted Digital ClockFormatted Digital Clock
24.129.34.Manual Update TargetManual Update Target