How does one open a WPF window, close it and then open another window without the application closing and not using frame navigation?

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The application I am writing has a configuration step in its startup where I collect required configs and user inputs before I init my Autofac DI. Then I close said window by invoking the standard Window.Close() call.

The code seems to execute correctly but the next window does not want to show. It seems like the Window.Close() results in an event which overrides anything after it has been called.

Here is some more code to shed some light on what I am doing:

C#

var connectionview = new ConnectionView(connectionViewModel);
var result = connectionview.ShowDialog();
if (result.messageResult == MessageDialogResult.No)
               return;

var bootstrapper = new Bootstrapper(tempConnectionContext);
Container = bootstrapper.Bootstrap();
_mainViewModel = Container.Resolve<MainWindowViewModel>();
MainWindow = new MainWindow(_mainViewModel);
MainWindow.Show();

If anyone could point me into a direction too it would help. Any help would be wonderful.
Thanks

What I have tried:

I don't think I am searching in the right places.

Posted 26-Nov-17 21:53pm

Ocqlarity

Updated 27-Nov-17 14:24pm

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3 solutions

Solution 2

In both Windows Forms and WPF, there is a hierarchy to windows. Your startup window is the top of the hierarchy tree and any other windows that show up are children, with those children able to show their own child windows.

Once you close the top window of the tree, your application dies with it. So, the solution is rather simple. You set the wrong window as your startup window. The startup windows should ALWAYS be the main form of your application, not a login form, not a settings dialog, ...

Posted 27-Nov-17 6:00am

Dave Kreskowiak

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Graeme_Grant 27-Nov-17 20:25pm

But that would mean that he would have to break the MVVM rules to directly access the Visual Tree from the VM. You don't need to do that. See my answer and link below for the correct way.

PureNsanity 30-Nov-17 3:36am

The OP said:

Quote:OP said:
The application I am writing has a configuration step in its startup

I would not consider any startup or Bootstrapper code to be VM.

There's also a lot easier ways to create glue from control to control, and between VM and control than proxies... While a proxy can be a good way to solve it in some instances, DependencyProperties, Converters, and Commands are made for that without having to manage an additional proxy class.

Ocqlarity 5-Mar-18 6:13am

Hi Dave

Thank you for the contribution. Although your response is correct, Graeme is right in saying that I do not want to break the MVVM rules and therefore the answer you have provided does not work for my situation. I have used your recommendation in a different project though. So thanks again.

Solution 1

I think your application is closed after the Close of the mainwindow. So either don't make the first window the MainWindow (just a Dialog, like a splashscreen) or use ShutdownMode="OnExplicitShutdown"
for you application

Posted 27-Nov-17 5:46am

johannesnestler

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Graeme_Grant · Accepted Answer · 2017-11-27T14:24:00

Solution 3

For MVVM, you need to use a proxy service as VMs are not supposed to access any UI, including windows. I have answer this in a similar question.

Please check out my answer there rather than me reposting it here: How to change listbox item size dynamically in C# WPF?[^]

UPDATE:

This article will be of great help to you: Asynchronous Programming - Async from the Start[^]

Posted 27-Nov-17 14:24pm

Graeme_Grant

Updated 27-Nov-17 14:52pm

v2

Comments

Ocqlarity 28-Nov-17 3:31am

Thanks, works like a charm and it provides some cool additions.

Graeme_Grant 28-Nov-17 4:59am

Glad to hear! :)

Also, check out my WPF Toggle switch article[^]... a cool addition to any WPF app!