Roslyn analyser code fix - Disable preview option

Question

How do I disable the preview dialog that shows up after the light bulb in C# project?

Problem I have is, the RegisterCodeFixesAsync makes a call to database and incr

Answer 1

CodeAction has separate ComputePreviewOperationsAsync() and ComputeOperationsAsync(). Having them return different values is what I believe you're looking for. But if you use the common approach of calling CodeAction.Create(), both will return the same values.

What you can do instead is to create a custom class that inherits from CodeAction and overrides the methods the way you want. For example:

class NoPreviewCodeAction : CodeAction
{
    private readonly Func> createChangedSolution;

    public override string Title { get; }

    public override string EquivalenceKey { get; }

    public NoPreviewCodeAction(
        string title, Func> createChangedSolution,
        string equivalenceKey = null)
    {
        this.createChangedSolution = createChangedSolution;

        Title = title;
        EquivalenceKey = equivalenceKey;
    }

    protected override Task> ComputePreviewOperationsAsync(
        CancellationToken cancellationToken)
    {
        return Task.FromResult(Enumerable.Empty());
    }

    protected override Task GetChangedSolutionAsync(
        CancellationToken cancellationToken)
    {
        return createChangedSolution(cancellationToken);
    }
}

This version completely disables preview. Another option would be to make preview take a different path, e.g. querying the database for the next value, but not updating it.