// Demo of handling special composite exceptions that need to be converted to one or more errors in the response.
// Ex: VITA ORM defines ClientFaultException that contains multiple validation errors; the call to SaveChanges
// might throw this exception, with multiple validation errors inside. We will catch the ClientFaultException
// in the OperationError event handler, unpack errors inside and add them as separate errors in the response.
// Here we catch AggregateException to demo/test the technique; we have a resolver that throws this exc with
// multiple child exceptions inside.
private static void Events_OperationError(object sender, OperationErrorEventArgs args)
{
if (args.Exception is AggregateException aex)
{
var ctx = args.RequestContext;
foreach (var childExc in aex.InnerExceptions)
{
ctx.AddError(childExc.Message, args.RequestItem, errorType: "Aggr-Error");
}
// clear original exc
args.ClearException();
}
}
public void AddError(FieldContext fieldContext, Exception ex, string errorType)
{
_failed = true;
// fire event
var eventArgs = new OperationErrorEventArgs(_requestContext, this._mappedOpField.Field, ex);
_requestContext.Server.Events.OnOperationError(eventArgs);
if (eventArgs.Exception == null)
{
return; // event handler cleared error
}
// add error
fieldContext.AddError(ex, errorType);
}
void operation_Error(object sender, OperationErrorEventArgs e)
{
Invoke(() => errorOutput.DisplayError(e.ErrorMessage, e.Exception));
}
void operation_Error(object sender, OperationErrorEventArgs e)
{
errorOutput.DisplayError(e.ErrorMessage);
}
void FavouritesManager_OperationError(object sender, OperationErrorEventArgs e)
{
Twitter_OperationError(sender, e);
}
void Twitter_OperationError(object sender, OperationErrorEventArgs e)
{
SetLoading(false);
//MessageBox.Show(e.Message);
}
private void operation_Error(object sender, OperationErrorEventArgs e)
{
Error = e.Error;
}
