Describe the bug

ConstrainedBox crashes with all cultures not using '.' as the decimal separator.

Reason

ConvertToAspectRatio in AspectRatio uses Convert.ToDouble which is region/culture-sensitive.

The method will crash if you try to parse "1.666" if the region is France, Italy or other regions not using '.' as the decimal separator.

Instead, the method should use:
double value = double.Parse(number, NumberStyles.AllowDecimalPoint, CultureInfo.CurrentCulture);

• Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work:

Steps to Reproduce

Steps to reproduce the behavior:

1. Switch the region to France or Italy and set Regional Format to France, Italy or Recommended
2. Launch a test app with a ConstrainedBox control
3. See crash

Expected behavior

Not crash :)

Screenshots

Environment

NuGet Package(s): 7.1.0-rc1

Package Version(s):

Windows 10 Build Number:

• Fall Creators Update (16299)
• April 2018 Update (17134)
• October 2018 Update (17763)
• May 2019 Update (18362)
• May 2020 Update (19041)
• Insider Build (won't disclosure)

App min and target version:

• Fall Creators Update (16299)
• April 2018 Update (17134)
• October 2018 Update (17763)
• May 2019 Update (18362)
• May 2020 Update (19041)
• Insider Build (won't disclosure)

Device form factor:

• Desktop
• Xbox
• Surface Hub
• IoT

Visual Studio version:

• 2017 (15.{minor_version})
• 2019 (16.{minor_version})
• 2022 (17.{minor_version})