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{ if (propertyName == "ModelNumber") { bool valid = true; foreach (char c in ModelNumber) { if (!Char.IsLetterOrDigit(c)) { valid = false; break; } } if (!valid) return "The ModelNumber can only contain letters and numbers."; } return null; } } // WPF doesn't use this property. public string Error { get { return null; } } } To tell WPF to use the IDataErrorInfo interface and use it to check for errors when a property is modified, you must add the DataErrorValidationRule to the collection of Binding.ValidationRules, as shown here: <TextBox Margin="5" Grid.Column="1"> <TextBox.Text> <Binding Path="ModelNumber"> <Binding.ValidationRules> <DataErrorValidationRule></DataErrorValidationRule> </Binding.ValidationRules> </Binding> </TextBox.Text> </TextBox> Incidentally, you can combine both approaches by creating a data object that throws exceptions for some types of errors and uses IDataErrorInfo to report others. You just need to make sure you use both the ExceptionValidationRule and the DataErrorValidationRule.

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Tip .NET provides two shortcuts. Rather than adding the ExceptionValidationRule to the binding, you can set

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The skeleton view is almost as simple as the model, because it delegates everything to the ViewModel. The XAML markup in Listing 4 2 shows how simple this view really is. Listing 4 2. The XAML Markup for the Default MVVM Sample View <Window x:Class="MvvmWpfApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:viewModel="clr-namespace:MvvmWpfApp.ViewModel;assembly=MvvmWpfApp.ViewModel" Title="MainWindow" Height="100" Width="200"> <Window.Resources> <viewModel:SampleViewModel x:Key="sampleViewModel" /> </Window.Resources> <StackPanel Orientation="Vertical"> <TextBlock Text="{Binding Source={StaticResource sampleViewModel}, Path=Result}" /> <StackPanel Orientation="Horizontal"> <Label Content="Number:" /> <TextBox Text="{Binding Source={StaticResource sampleViewModel}, Path=Number}" Width="50" /> <Button Content="Calculate" Command="{Binding Source={StaticResource sampleViewModel}, Path=CalculateSquareRootCommand}" /> </StackPanel> </StackPanel> </Window> We ve made the lines we are particularly interested in bold for clarity. Taking each in turn, let s now see each line s purpose. The ViewModel XML namespace declaration is the XAML synonym for a C# using statement or Visual Basic Imports statement. This particular namespace references the ViewModel project s namespace within the ViewModel s assembly. By including this namespace declaration, we can reference any of the classes within that namespace elsewhere in this XAML file. The Window s Resources section makes use of the viewModel namespace and declares an instance of the SampleViewModel class. The x:Key attribute allows us to reference this specific object elsewhere in the XAML analogous to a variable name. It s important to note that we have declaratively instantiated the SampleViewModel class and effectively assigned it the variable name of sampleViewModel. This particular variable is then referenced in three bindings within the Window: A TextBlock s Text property is bound to the Result property. A TextBox s Text property is bound to the Number property. A Button s Command property is bound to the CalculateSquareRootCommand property.

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the Binding.ValidatesOnExceptions property to true. Rather than adding the DataErrorValidationRule, you can set the Binding.ValidatesOnDataErrors property to true.

The unifying identity metasystem must guarantee its users a simple, consistent experience while enabling separation of contexts through multiple operators and technologies. Regardless of the underlying protocols, technologies, and operators, there needs to be a level of consistency and a set of expectations for how identity requests should appear, how the interactions should take place, and what one can expect to occur. These expectations need to be consistent and expected.

The approach for applying a custom validation rule is similar to applying a custom converter. You define a class that derives from ValidationRule (in the System.Windows.Controls namespace), and you override the Validate() method to perform your validation. If desired, you can add properties that accept other details that you can use to influence your validation (for example, a validation rule that examines text might include a Boolean CaseSensitive property). Here s a complete validation rule that restricts decimal values to fall between some set minimum and maximum. By default, the minimum is set at 0, and the maximum is the largest number that will fit in the decimal data type, because this validation rule is intended for use with currency values. However, both these details are configurable through properties for maximum flexibility. public class PositivePriceRule : ValidationRule { private decimal min = 0; private decimal max = Decimal.MaxValue; public decimal Min { get { return min; } set { min = value; } } public decimal Max { get { return max; } set { max = value; } } public override ValidationResult Validate(object value, CultureInfo cultureInfo) { decimal price = 0; try { if (((string)value).Length > 0) price = Decimal.Parse((string)value, NumberStyles.Any, culture); } catch { return new ValidationResult(false, "Illegal characters."); } if ((price { return "Not } else { return < Min) || (price > Max)) new ValidationResult(false, in the range " + Min + " to " + Max + ".");

new ValidationResult(true, null);

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