/// <summary>
/// BaseViewModel constructor.
/// </summary>
protected BaseViewModel()
{
_onInitSubscribers = new List <Guid>();
_onAppearingSubscribers = new List <Guid>();
Resolver = Application.Current.Resolve <IServiceResolver>();
Lifecycle = LifecycleState.Initiate;
InitCommand = new XamAsyncCommand(() => { });
AppearingCommand = new XamAsyncCommand(() => { });
DisappearingCommand = new XamAsyncCommand(() => { });
CloseCommand = new XamAsyncCommand(async() => await CloseAsync());
LoadCommand = new XamAsyncCommand(() => { });
UnloadCommand = new XamAsyncCommand(() => { });
FocusCommand = new Command(() => { });
BackButtonPressed = new BackButtonCommand(x => Close());
ExecuteCommand = async command =>
{
switch (command)
{
case IXamAsyncCommand a:
await a.ExecuteAsync();
break;
default:
command?.Execute(null);
break;
}
};
}
/// <summary>
/// Execute command asynchronously.
/// </summary>
/// <param name="command">command</param>
/// <returns>task</returns>
public static Task ExecuteAsync(this ICommand command)
{
return(command switch
{
XamAsyncCommand cmd0 => cmd0.ExecuteAsync(),
XamAsyncCommand <object> cmd1 => cmd1.ExecuteAsync(null),
_ => throw new InvalidOperationException(nameof(command))
});
