unoplatform/uno

`FrameworkElement_Sizes` crashes on WinUI

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#19,198 opened on Jan 10, 2025

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 (4 comments) (0 reactions) (0 assignees)C# (9,789 stars) (837 forks)batch import
area/tests 🧪difficulty/starter 🚀good first issuekind/bug

Description

Current behavior

This sample crashes the app on WinUI - investigate why that does not happen on Uno Platform targets.

Expected behavior

The behavior should be the same on Uno as on WinUI

How to reproduce it (as minimally and precisely as possible)

No response

Workaround

No response

Works on UWP/WinUI

None

Environment

No response

NuGet package version(s)

No response

Affected platforms

No response

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response

Contributor guide

Tech stack
csharp
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
C#XAMLUno Platform basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
The issue describes a crash of `FrameworkElement Sizes` on WinUI that does not occur on Uno targets. Investigation should begin by examining the `FrameworkElement Sizes` related code in the Uno repository, likely in the `src/Uno.UI` folder. Compare the layout or measure logic between Uno and WinUI to identify differences. The provided sample is not included, so the first step is to request a minimal reproduction from the reporter. Check the four comments for any additional details. The crash may be related to a missing null check or a difference in how sizes are computed.