_usage.md

Nice for making sure stuff is cleaned up for methods that can throw but that give ownership to the caller on success rather than disposing:

var tempFile = new TempFile();
using var successTracker = new ConditionalDisposer(tempFile);

// Do stuff with the temporary file that involves reading from sources that may throw

successTracker.CancelDisposal();
return tempFile;

ConditionalDisposer.cs

using System;

public struct ConditionalDisposer : IDisposable
{
    private readonly IDisposable disposable;
    private bool shouldDispose;

    public ConditionalDisposer(IDisposable disposable)
    {
        this.disposable = disposable ?? throw new ArgumentNullException(nameof(disposable));
        shouldDispose = true;
    }

    public void CancelDisposal() => shouldDispose = false;

    public void Dispose()
    {
        if (!shouldDispose) return;
        shouldDispose = false;
        disposable.Dispose();
    }
}