Самке Posts - Answer Overflow

Самке

•Created by Самке on 7/7/2024 in #help

Updating progress on the screen problem

I am learning about asynchronous programming and i run into a problem with updating progress from async task. For some reason the task is doing its job correctly but the progress.ProgressChanged event doesn't update the progress on the screen correctly.

c#
    public static async Task<long> CalculateSumAsync(int n, CancellationToken token, IProgress<(int, long)>? progress = null)
    {
        if (n <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(n));
        }

        long result = 0;

        var res = await Task.Run(() =>
        {
            for (var i = 1; i <= n; i++)
            {
                result += i;

                token.ThrowIfCancellationRequested();

                progress?.Report((i, result));
            }

            return result;
        });

        return res;
    }

c#
    public static async Task<long> CalculateSumAsync(int n, CancellationToken token, IProgress<(int, long)>? progress = null)
    {
        if (n <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(n));
        }

        long result = 0;

        var res = await Task.Run(() =>
        {
            for (var i = 1; i <= n; i++)
            {
                result += i;

                token.ThrowIfCancellationRequested();

                progress?.Report((i, result));
            }

            return result;
        });

        return res;
    }

c#
        progress.ProgressChanged += (sender, tuple) =>
        {
            latestProgress = tuple;
            Console.WriteLine($"index: {latestProgress.progressValue}    progress: {latestProgress.progressLong}");
        };

c#
        progress.ProgressChanged += (sender, tuple) =>
        {
            latestProgress = tuple;
            Console.WriteLine($"index: {latestProgress.progressValue}    progress: {latestProgress.progressLong}");
        };

Result: Press C to exit Enter the number: 15 index: 1 progress: 1 index: 3 progress: 6 index: 3 progress: 6 index: 3 progress: 6 index: 3 progress: 6 index: 8 progress: 36 index: 9 progress: 45 index: 8 progress: 45 index: 10 progress: 55 index: 11 progress: 66 index: 15 progress: 120 index: 14 progress: 105 index: 6 progress: 21 Final result: 120 index: 13 progress: 91 index: 12 progress: 78

19 replies

Gaming

Programming