public async Task <TResult> ShowDialogAsync <TResult>(BaseDialogViewModel <TResult> viewModel)
{
if (shell.IsDialogShown)
{
throw new InvalidOperationException("Other dialog is already shown.");
}
var tcs = new TaskCompletionSource <TResult>();
var view = GetView(viewModel.GetType());
view.DataContext = viewModel;
viewModel.RequestCloseCallback = r =>
{
shell.HideDialogAsync();
tcs.TrySetResult(r);
};
try
{
shell.IsDialogShown = true;
await shell.ShowDialogAsync(view);
return(await tcs.Task);
}
finally
{
shell.IsDialogShown = false;
viewModel.RequestCloseCallback = null;
}
}
private static async Task <object> ShowDialogInternal(BaseDialogViewModel vm)
{
var viewType = await FindView(vm.GetType());
var view = Activator.CreateInstance(viewType) as UserControl;
view.DataContext = vm;
return(await DialogHost.Show(view, openedEventHandler : (sender, e) =>
{
vm.Close = e.Session.Close;
}));
}