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 C# ListMethodsInCurrentFile and primary ctor

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azur Posted - Sep 12 2025 : 09:27:37 AM

public class X {
  private readonly string _name = string.Empty;

  public X(string? name)
  {
    _name = name ?? string.Empty;
  }
  public bool IsValid()
  {
    return !string.IsNullOrEmpty(_name);
  }
}


ListMethodsInCurrentFile show me "X, X.IsValid, X.X(string? name)"

When I use C# with TargetFrameWork net9.0, I got IDE0290 'Use primary constructor'.

If I follow the suggestion then the code looks like this.


public class X(string? name) {

 private readonly string _name = name ?? string.Empty;

 public bool IsValid()
 {
   return !string.IsNullOrEmpty(_name);
 }
}

ListMethodsInCurrentFile then only show me "X(string? name)"
3   L A T E S T    R E P L I E S    (Newest First)
feline Posted - Sep 16 2025 : 10:24:16 AM
Azur thank you for that.

For anyone else who ends up here, I have found a better approach than editing the source code.

Open Solution Explorer
Right click on the project in the solution.
Add -> New Item...
If you get the small dialog just asking for a filename use the "Show All Templates" button
Under "C# Items" select "editorconfig File (empty)"
In the editor for the .editconfig file go to the "Code Style" page and filter on "primary constructor" and toggle the Value column to "No"
azur Posted - Sep 16 2025 : 08:28:38 AM
I sent an email to support.
feline Posted - Sep 15 2025 : 06:59:52 AM
Thank you for the clear description. Unfortunately VA doesn't currently support C# primary constructors, but this is something that is on our list of things to fix:

case=165542

One user who ran into this reported adding the following to suppress the prompt for now:

[System.Diagnostics.CodeAnalysis.SuppressMessage("Style", "IDE0290:Use primary constructor", Justification = "Otherwise Visual Assist will not recognize the members.")]


If you have a moment you might want to report this via email to [email protected] since the new reports that get run to track interest in, and problems with open cases only pick up things reported via email, not posted here to the forum. So that would give this case a bit more weight.

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