WPF page reloading when becomes High Contrast theme.

When I change my Windows Theme to High Contrast, the current page of my WPF application reloads, starting the Constructor. If I activate a Toggle Switch and change it to High Contrast, the toggle becomes inactivated again.

Hui Liu-MSFT 44,631 Reputation points Microsoft Vendor

2023-08-31T01:17:48.5733333+00:00

Hi,@ Anderson Rodrigues Cavalcante. Welcome Microsoft Q&A. Could you show me what the code for your Windows Theme is? What is the screenshot of the result of your problem and what are the steps to reproduce it?
Anderson Rodrigues Cavalcante 271 Reputation points

2023-08-31T11:28:45.3733333+00:00

@Hui Liu-MSFT thanks for your return. Unfortunately It is a code from a company and I have no permission to share.
But I'd like only to know if change to High Contrast affects the reload of the page in WPF. My page simply navigate again for the page. It is a normal behavior or my bug?
Hui Liu-MSFT 44,631 Reputation points Microsoft Vendor

2023-09-01T09:29:29.32+00:00
Hi,@ Anderson Rodrigues Cavalcante.

By default, when the Windows theme changes to High Contrast, it can affect the appearance and behavior of your application.

When a user enables High Contrast mode, Windows applies a high-contrast theme to the entire system, including applications.

When the Windows system theme changes (e.g., when High Contrast mode is enabled or disabled), some WPF applications may reload or reinitialize because changes in the system theme can trigger a change in the application's visual appearance and behavior.

You could try the following methods.

Detect High Contrast Mode: You can detect whether High Contrast mode is active in your application using the SystemParameters.HighContrast property. This property returns true if High Contrast mode is enabled.

bool isHighContrast = SystemParameters. HighContrast;

Handling Theme Changes in WPF: To handle theme changes and prevent unnecessary reloading of your application, you could override the OnThemeChanged method in your WPF window or control. This method is called when the system theme changes.

protected override void OnThemeChanged(ThemeChangedEventArgs e) { // Handle theme change here, if needed base.OnThemeChanged(e); }

When a Toggle Switch (or any UI control) becomes inactivated after changing to High Contrast mode, it may be due to styling conflicts. Ensure that your Toggle Switch control is using system theme-aware styles or templates.
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WPF page reloading when becomes High Contrast theme.