dotnet/roslyn

Usage of the variable Args in a C# script file is marked as error

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#37,376 opened on Jul 19, 2019

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 (1 comment) (0 reactions) (1 assignee)C# (20,414 stars) (4,257 forks)batch import
Area-InteractiveBugDeveloper CommunityInteractive-ScriptingIDERegressionhelp wanted

Description

  • Create a CSX script file which uses the global Args variable to access command line parameters, e.g. 
    Console.WriteLine(Args[0]);
  • Running it with csi is fine and shows the expected ouput
  • Add the file to a solution and edit it in Visual Studio
  • In the editor, all occurences of Args are underlined red because "the variable args is not available in the current context", which is obviously false
  • In Visual Studi 2017 editing the same script file did not procuce this annoying error message.

This issue has been moved from https://developercommunity.visualstudio.com/content/problem/548537/usage-of-the-variable-args-in-a-c-script-file-is-m.html VSTS ticketId: 857005 These are the original issue comments:

Visual Studio Feedback System on 4/27/2019, 10:54 PM (82 days ago): We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

These are the original issue solutions: (no solutions)

Contributor guide

Tech stack
csharp
Domain
tooling
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic C# knowledgeFamiliarity with Roslyn internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate how Roslyn handles the global `Args` variable in C# script (CSX) files. Look in the Scripting directory, specifically the semantic model and binder logic. The issue is that the editor incorrectly reports 'variable args is not available in the current context'. Since the issue has an assignee (noted from the assignee count) and no linked PR, it may be stale. Begin by examining test files for script compilation and the Binder or DiagnosticAnalyzer that produces the false error. Reference the original VSTS ticket for context.