Sample for using `IProgress` in long-running tasks in C#

sample-using-iprogress.cs

/*
`IProgress<T>` in C# is an interface provided by the .NET Framework to report progress in an asynchronous operation. It allows a producer (usually a background task) to communicate progress updates to a consumer (often the UI thread or another monitoring task).
This setup ensures that the progress reporting mechanism is thread-safe and that the consumer of the progress updates can safely update the UI or other state based on the progress.
 */

// var progress = new Progress<(long count, List<string> files)>(ReportProgress);

var progress = new Progress<(long count, List<string> files)>();
progress.ProgressChanged += (_, data) => {
    Console.WriteLine($"{data.count} files read. Last file: {data.files.Last()}");
};

await ReadFiles(progress);
return;

static async Task ReadFiles(IProgress<(long count, List<string> files)>? progress) {
    var files = new List<string>();
    for (var i = 1; i < 1000; i++) {
        await Task.Delay(500);
        files.Add($"File {i}");
        progress?.Report((i, files));
    }
}