Display Error or Information from ViewModel to View

问题

How to display an Error or information (Toast,Message Box..) from view model to view.

Note: I am developing a cross platform application for Droid,Touch and Wp8.

回答1:

There are several ways to do this:

1. Use a messenger or a custom object/event chain to send the error event notification to the UI. This is shown in https://github.com/MvvmCross/MvvmCross-Tutorials/tree/master/Sample%20-%20BestSellers/BestSellers and discussed in Alerts or Popups in MvvmCross

2. Provide and use a "dialog service" - like that provided by https://github.com/brianchance/MvvmCross-UserInteraction - in order to show messages

3. Use an "interaction pattern" - like that exposed by Prism - see MvvmCross Dialog

回答2:

We've successfully tried to use the plugin 'Acr.MvvmCross.Plugins.UserDialogs' and it's working very well and has many features.

For example we have in splash screen a checking connectivity module and we used the plugin in order to display an error message:

public override void ReportError(string error)
        {
            InvokeOnMainThread(() =>
                {
                var toast = Mvx.Resolve<IUserDialogService>();
                toast.Toast("Network error, please restart the application", 5);

                });

        }

BTW, if you're interested in other useful plugins have a look at this page: https://github.com/aritchie/acrmvvmcross

来源：https://stackoverflow.com/questions/19448898/display-error-or-information-from-viewmodel-to-view