public Wheel(IProductId productId, Dimension dimension)
{
this.ProductId = productId;
this.Dimension = dimension;
}
/// <summary>
/// Handle all unhandled exceptions.
/// </summary>
/// <param name="sender">The object that generated the event.</param>
/// <param name="dispatcherUnhandledExceptionEventArgs">Information about the exception event.</param>
void OnDispatcherUnhandledException(Object sender, DispatcherUnhandledExceptionEventArgs dispatcherUnhandledExceptionEventArgs)
{
// A certain class of errors should kill the application, others will just mortally wound it. This is used to euthanize the application when the right
// conditions arise.
Boolean isFatal = false;
// This string will collect the error message that is eventually displayed to the user after the exceptions are examined in order of importance to the
// user. The more generic exceptions are examined first and then, if more specific information is available, it will overwrite the generic message.
String errorMessage = null;
// This handler will try to extract the most specific error message and work its way up to the least specific. As a general rule, if a specific error
// message can be made more friendly for the user, the effort is made to provide a less technical description and a more action-oriented message.
if (dispatcherUnhandledExceptionEventArgs.Exception.InnerException != null)
{
// The inner exception has the real reason for this exception.
Exception innerException = dispatcherUnhandledExceptionEventArgs.Exception.InnerException;
// This will determine if the invalid period for a license has expired and provide detailed instructions about how to correct the error
// including the product name and manufacturer.
InvalidLicenseException invalidlicenseException = innerException as InvalidLicenseException;
if (invalidlicenseException != null)
{
IProductId iProductId = invalidlicenseException.Instance as IProductId;
errorMessage = ExceptionMessage.Format(
Teraque.ExplorerChromeExample.Properties.Resources.InvalidLicense,
App.productNames[iProductId.ProductId]);
isFatal = true;
}
// This will determine if the evaluation period for a license has expired and provide detailed instructions about how to correct the error
// including the product name and manufacturer.
EvaluationLicenseException evaluationlicenseException = innerException as EvaluationLicenseException;
if (evaluationlicenseException != null)
{
IProductId iProductId = evaluationlicenseException.Instance as IProductId;
errorMessage = ExceptionMessage.Format(
Teraque.ExplorerChromeExample.Properties.Resources.EvaluationLicense,
App.productNames[iProductId.ProductId]);
isFatal = true;
}
// This will determine if the a valid license has expired and provide detailed instructions about how to correct the error including the product
// name and manufacturer.
ExpiredLicenseException expiredlicenseException = innerException as ExpiredLicenseException;
if (expiredlicenseException != null)
{
IProductId iProductId = expiredlicenseException.Instance as IProductId;
errorMessage = ExceptionMessage.Format(
Teraque.ExplorerChromeExample.Properties.Resources.ExpiredLicense,
App.productNames[iProductId.ProductId]);
isFatal = true;
}
// If a message wasn't extracted for a specific purpose above then use the general message associated with the inner exception as the text that the
// user will see.
if (errorMessage == null)
{
errorMessage = dispatcherUnhandledExceptionEventArgs.Exception.InnerException.Message;
}
}
// The handling of this event works from the most specific error message to the least specific. If no error message has been extracted by this point
// the message associated with the exception that generated this event is used as the most general message.
if (errorMessage == null)
{
errorMessage = dispatcherUnhandledExceptionEventArgs.Exception.Message;
}
// Display the message associated with the exception to the user.
MessageBox.Show(errorMessage, Teraque.ExplorerChromeExample.Properties.Resources.Title, MessageBoxButton.OK, MessageBoxImage.Error);
// If the error was fatal then shut down the application.
if (isFatal)
{
Application.Current.Shutdown();
}
// The exceptions will not kill the program.
dispatcherUnhandledExceptionEventArgs.Handled = true;
}