NumericUpDown.StringFormat not working via Code behind

[skelvir]

What steps will reproduce this issue?

NumericUpDown.StringFormat is working fine if declared in XAML, but if you try to change it via Code behind, it will cause an exception.

Expected outcome

Changing StringFormat should update the content while preserving the Value

Repo

https://github.com/skelvir/Wpf_NumericUDissue.git

Environment

• MahApps.Metro 1.5.0.23
• Windows 7 64-bit
• Visual Studio 2017 Community
• .NET Framework 4.5

[punker76]

@skelvir Thank you for the sample! 👍 This issue is already fixed and will be available in v1.6 (or via appveyor nightly build).

Duplicate of #3031

PS: Why do you want to change the format on any value change?

[skelvir]

@punker76 I do not intend to change on any value change, I just used that as a quick sample.
In reality I only need to change once during initialization.