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Added Then MessageBoxShow(eErrorErrorContentToString()) End If End Sub The ValidationErrorEventArgsError property provides a ValidationError object that bundles together several useful details, including the exception that caused the problem (Exception), the validation rule that was violated (ValidationRule), the associated Binding object (BindingInError), and any custom information that the ValidationRule object has returned (ErrorContent) If you re using custom validation rules, you ll almost certainly choose to place the error information in the ValidationErrorErrorContent property If you re using the ExceptionValidationRule, the ErrorContent property will return the Message property of the corresponding exception However, there s a catch If an exception occurs because the data type cannot be cast to the appropriate value, the ErrorContent works as expected and reports the problem.

// // codeNumberNotPositive // this.codeNumberNotPositive.Name = "codeNumberNotPositive"; this.codeNumberNotPositive.ExecuteCode += new System.EventHandler(this.codeNumberNotPositive_ExecuteCode); // // codeNumberIsPositive // this.codeNumberIsPositive.Name = "codeNumberIsPositive"; this.codeNumberIsPositive.ExecuteCode += new System.EventHandler(this.codeNumberIsPositive_ExecuteCode); // // ifElseBranchActivity2 // this.ifElseBranchActivity2.Activities.Add(this.codeNumberNotPositive); this.ifElseBranchActivity2.Name = "ifElseBranchActivity2"; // // ifElseBranchActivity1 // this.ifElseBranchActivity1.Activities.Add(this.codeNumberIsPositive); codecondition1.Condition += new System.EventHandler< System.Workflow.Activities.ConditionalEventArgs>( this.IsNumberPositive); this.ifElseBranchActivity1.Condition = codecondition1; this.ifElseBranchActivity1.Name = "ifElseBranchActivity1"; // // ifElseActivity1 // this.ifElseActivity1.Activities.Add(this.ifElseBranchActivity1); this.ifElseActivity1.Activities.Add(this.ifElseBranchActivity2); this.ifElseActivity1.Name = "ifElseActivity1"; // // CodeOnlyWorkflow // this.Activities.Add(this.ifElseActivity1); this.Name = "CodeOnlyWorkflow"; this.CanModifyActivities = false; } #endregion private private private private private } } As you can see from Listing 16-3, the designer-generated code is all contained in a single InitializeComponent method. You should note that this is the method that is executed from the class constructor shown in Listing 16-1. The code in this method is fairly straightforward. Instances of CodeActivity codeNumberNotPositive; CodeActivity codeNumberIsPositive; IfElseBranchActivity ifElseBranchActivity2; IfElseBranchActivity ifElseBranchActivity1; IfElseActivity ifElseActivity1;

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However, if the property setter in the data object throws an exception, this exception is wrapped in a TargetInvocationException, and the ErrorContent provides the text from the TargetInvocationExceptionMessage 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 a null reference (Nothing), you can retrieve the original exception object and use its Message property instead of the ValidationErrorErrorContent 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.

each activity are created, properties are set, event handlers are added, children are added to parents, and so on. There is nothing in this code that is difficult to understand and you could have easily written this code yourself by hand. But instead, the workflow designer handles that task for you.

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 Sub cmdOK_Click(ByVal sender As Object, ByVal e As RoutedEventArgs) Dim message As String If FormHasErrors(message) Then ' 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.). End If End Sub Private Function FormHasErrors(ByRef message As String) As Boolean Dim sb As New StringBuilder() GetErrors(sb, gridProductDetails) message = sb.ToString() Return (message <> "") End Function Private Sub GetErrors(ByVal sb As StringBuilder, ByVal obj As DependencyObject) For Each child As Object In LogicalTreeHelper.GetChildren(obj) Dim element As TextBox = CType(child,TextBox) If element Is Nothing Then Continue For End If If Validation.GetHasError(element) Then sb.Append((element.Text & " has errors:" & vbCrLf)) For Each error As ValidationError In Validation.GetErrors(element) sb.Append(" " & error.ErrorContent.ToString()) sb.Append("" & vbCrLf) Next End If ' Check the children of this object for errors. GetErrors(sb, element) Next End Sub 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.

The PencilTool class, and all the rest of the Tool classes, also makes use of the SYNTHESIZE_SINGLETON_FOR_CLASS macro. This chunk of code, which comes from Matt Gallagher s Cocoa with Love blog, provides a standardized way to make any class into a singleton. This is perfect for Dudel s tools, since we never need more than one of each kind. This macro overrides all of the methods that deal with memory management, making sure that only one instance of this class is ever created. To use it, add a new header file called SynthesizeSingleton.h to your project, with the following content:

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