dotnet/roslyn

Hovering over cast evaluates property value in debugger

Open

#33,252 opened on Feb 8, 2019

View on GitHub
 (0 comments) (0 reactions) (0 assignees)C# (4,257 forks)batch import
Area-InteractiveBugInteractive-Debugginghelp wanted

Repository metrics

Stars
 (20,414 stars)
PR merge metrics
 (Avg merge 6d 17h) (256 merged PRs in 30d)

Description

Version Used: Visual Studio 2019 Preview 2

🔗 Originally filed as https://devdiv.visualstudio.com/DevDiv/_workitems/edit/233955

Steps to Reproduce:

  1. Create a new WPF application

  2. In the main window constructor, add the following:

    BooleanToVisibilityConverter converter = new BooleanToVisibilityConverter();
Visibility x = (Visibility)converter.Convert(true, null, null, null);

  3. Set a breakpoint on one of the lines above

  4. When the breakpoint is hit, hover over the (Visibility) type cast

Expected Behavior:

Quick Info is not shown (default behavior for hovering over a type while debugging).

Actual Behavior:

Quick Info shows the value of this.Visibility (default behavior for hovering over a property while debugging).

Contributor guide

Research direction
Investigate the debugger's expression evaluator to understand why hovering over a cast triggers property evaluation instead of being treated as a type cast. Look at how the debugger handles type casts in hover expressions.
Tech stack
csharp
Domain
developer experience
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
C#debugger concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35