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object throws an exception, this exception is wrapped in a TargetInvocationException, and the ErrorContent provides the text from the TargetInvocationException.Message property, which is the much less helpful warning Exception has been thrown by the target of an invocation. Thus, if you re using your property setters to raise exceptions, you ll need to add code that checks the InnerException property of the TargetInvocationException. If it s not null, you can retrieve the original exception object and use its Message property instead of the ValidationError.ErrorContent property.

At certain times, you might want to get a list of all the outstanding errors in your current window (or a given container in that window). This task is relatively straightforward all you need to do is walk through the element tree testing the Validation.HasError property of each element. The following code routine demonstrates an example that specifically searches out invalid data in TextBox objects. It uses recursive code to dig down through the entire element hierarchy. Along the way, the error information is aggregated into a single message that s then displayed to the user. private void cmdOK_Click(object sender, RoutedEventArgs e) { string message; if (FormHasErrors(message)) { // Errors still exist. MessageBox.Show(message); } else { // There are no errors. You can continue on to complete the task // (for example, apply the edit to the data source.). } } private bool FormHasErrors(out string message) { StringBuilder sb = new StringBuilder(); GetErrors(sb, gridProductDetails); message = sb.ToString(); return message != ""; } private void GetErrors(StringBuilder sb, DependencyObject obj) { foreach (object child in LogicalTreeHelper.GetChildren(obj)) { TextBox element = child as TextBox; if (element == null) continue; if (Validation.GetHasError(element)) { sb.Append(element.Text + " has errors:\r\n"); foreach (ValidationError error in Validation.GetErrors(element))

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{ sb.Append(" " + error.ErrorContent.ToString()); sb.Append("\r\n"); } } // Check the children of this object for errors. GetErrors(sb, element); } } } In a more complete implementation, the FormHasErrors() method would probably create a collection of objects with error information. The cmdOK_Click() event handler would then be responsible for constructing an appropriate message.

for example, the trust barrier might be fairly low. In this case, most identity providers cards would be accepted, including any cards you issued yourself. If the scenario was a high-value transaction, such as making a funds transfer or accessing medical records, the risk of accepting a card from a nontrusted source is very high. Identity providers in the metasystem will map to those in real life traditional identification providers (the government), payment service providers, financial services providers, clubs and associations, corporations, and individuals. There will also likely be new categories of identity providers that result as part of this open system.

The final piece of the jigsaw is the most important: the ViewModel. Listing 4 4 is the longest of the three, so pay close attention to the new concepts at work. Listing 4 4. The ViewModel Code Interacts with both the View and the Model using MvvmWpfApp.Model; namespace MvvmWpfApp.ViewModel { public class SampleViewModel : INotifyPropertyChanged { #region Constructors public SampleViewModel() { _model = new SampleModel(); } #endregion #region Properties public double Result { get { return _result; } private set { if(_result != value) { _result = value; if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("Result")); } } } } public double Number { get;

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