dotnet/wpf

Missing System.Windows.Media.Animation.BackEase in WpfGeneratedKnownTypes

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#6,588 opened on May 16, 2022

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 (11 comments) (0 reactions) (2 assignees)C# (6,683 stars) (1,126 forks)batch import
:construction: work in progresshelp wanted

Description

The System.Xaml.dll!System.Xaml.Schema.XamlObjectCreationFactory can create object directly by WpfGeneratedKnownTypes help. But we can not find the System.Windows.Media.Animation.BackEase in WpfGeneratedKnownTypes which means we should use the reflection to create the object.

Contributor guide

Tech stack
csharp
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic C# knowledgeFamiliarity with WPF type systemUnderstanding of XAML
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
The issue reports that System.Windows.Media.Animation.BackEase is missing from the WpfGeneratedKnownTypes list. To fix, locate the file `WpfGeneratedKnownTypes.cs` in the WPF repository, likely under `src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/`. Find where other easing functions like `LinearEase` are registered and add an entry for `BackEase`. Check the comments on the issue for any specific guidance or naming conventions. No linked PRs exist, so the fix is open. Ensure the new entry follows the existing pattern (e.g., type name, assembly). Test by building the WPF project and verifying that `BackEase` can be instantiated without reflection.