UWP questions, XAML, Windows Forms

VB_al 91

Hello, i have some questions/problems about UWP apps [VB.net]

-Why i can't code something like -> MsgBox("This is a question") but i have to code -> dim MESSAGE = new MessageDialog("This is aquestion)" [Imports Windows.UI.Popups]

-And i can't code something like
For Each EXAMPLE_with_processes In Process.GetProcesses(My.Computer.Name)
Next
because VS gives me an error on My.Computer.Name

-The code of mainpage [VB.net code] goes in MainPage.XAML.vb?
-I saw in MainPage.g.vb events generated in the GUI

I know these are a lot of questions, but i am really confused and i haven't found nothing in DOCS that helped me
Thanks

Leon Laude 85,726 Reputation points

2021-02-09T17:50:17.16+00:00

Added tag: windows-forms
Roy Li - MSFT 32,731 Reputation points Microsoft Vendor

2021-02-10T01:50:09.98+00:00

What kind of app that you are developing? A Windows forms app? Or a UWP app? The code you post is confused.
VB_al 91 Reputation points

2021-02-10T17:02:25.923+00:00

Hi @Roy Li - MSFT
Thanks for answering
Actually i am understanding differences between UWP and Windows Forms
I saw that it is not only XAML the difference but other code components such as MsgBox, this is why i am confused

another example -> in windows forms [VB.net] you can code something like this
For Each Example In Process.GetProcesses(My.Computer.Name)
Next
in UWP apps you cannot code this because VS gives you an error on ...(My.Computer.Name)

this is why i am not understanding and i am confused.

Thanks
Roy Li - MSFT 32,731 Reputation points Microsoft Vendor

2021-02-11T01:27:30.907+00:00

This is expected behavior. UWP is not the same as traditional desktop apps. UWP is running in the sandbox so that it has limitations compared with WPF apps or WinForms apps. If you want to use Process.GetProcesses() method in UWP, you have to add App Diagnostics capability. For more information please refer to app capability.
Ivanich 306 Reputation points

2021-02-11T09:26:04.63+00:00

As Roy already said, UWP is not the same as WPF. Instead of Win32 APIs, it works with new WinRT API, which was designed to be OOP-friendly and secure. In the far future, when all applications will finally migrate to WinRT, users will not have to install antivirus on their PCs, but for now both APIs coexist and developers have to choose between them. Win32 APIs for windows and dialog boxes were not quite secure in the sense that they allow to manipulate windows belonging to other processes. Diagnostics APIs are not what every app uses too. There is a limited subset of safe Win32 APIs that can be accessed from UWP apps, but in general, for every feature you are going to implement, you have to open documentation and find new alternative APIs.

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UWP questions, XAML, Windows Forms