public virtual async Task LinkNew_CommandAsync(IAsyncView tgtView, IAsyncView curView, CancellationToken token = default)
{
NameValueCollection query = LinkNew_Params();
ViewModel tgtModel = ServiceProvider.GetService <SalesOrderViewModel>();
await NavigateToAsync(tgtModel, tgtView, query, this, curView, token);
}
/// <summary>
/// Asynchronous routine to activate a view model with given parameters either as a child or as standalone
/// and display it in a new view or an existing view, which will need to be successfully closed first.
/// </summary>
/// <param name="tgtViewModel">View model to activate</param>
/// <param name="tgtView">View to bind to the model</param>
/// <param name="activationParams">A collection of activation parameters</param>
/// <param name="srcViewModel">Parent model, or null if activate as standalone</param>
/// <param name="curView">Optional current view to be replaced by the target view. Same as tgtView if we need to reuse the target view</param>
/// <param name="token">Cancellation token.</param>
/// <returns>True if navigation succeeded, false otherwise</returns>
public static async Task <bool> NavigateToAsync(ViewModel tgtViewModel, IAsyncView tgtView,
NameValueCollection activationParams, ViewModel srcViewModel, IAsyncView curView, CancellationToken token = default)
{
if (tgtViewModel == null || tgtView == null || curView != null && !(await curView.CanCloseAsync(token)))
{
return(false);
}
if (srcViewModel != null)
{
srcViewModel.SubscribeToChildEvents(tgtViewModel);
}
if (!(await tgtViewModel.ActivateAsync(activationParams, token)) && srcViewModel != null)
{
return(false); // child model activation reports showing view is not needed
}
if (curView != null)
{ // close the current view, or dispose if reusing it
if (curView != tgtView)
{
await curView.CloseAsync(token);
}
else
{
await curView.DisposeAsync(token);
}
}
tgtView.BindTo(tgtViewModel);
await tgtView.ShowAsync(token); // always show even for the same view, in case mode has changed
await tgtViewModel.FireEventAsync(ViewEvent.Opened);
return(true);
}
