csharpguvenlidosyaindirme.cs

using System;
using System.ComponentModel;
using System.IO;
using System.Net;
using System.Security.Cryptography;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Csharp_ile_ProgressBar_Kullanımı
{
    public partial class Form1 : Form
    {
        private Downloader downloader;

        public Form1()
        {
            InitializeComponent();
            downloader = new Downloader(progressBar1);
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            await downloader.DownloadFileAsync();
        }
    }

    public class Downloader
    {
        private ProgressBar progressBar;
        private string fileUrl = "https://www.rarlab.com/rar/winrar-x64-624tr.exe";
        private string dosyaAdi = "winrar.exe";
        private string expectedHash = "d2e34475e926ea0b652d01bd629a7fe7"; // Örnek doğru hash

        public Downloader(ProgressBar progressBar)
        {
            this.progressBar = progressBar;
            this.progressBar.Minimum = 0;
            this.progressBar.Maximum = 100;
            this.progressBar.Value = 0;
        }

        public async Task DownloadFileAsync()
        {
            using (WebClient client = new WebClient())
            {
                client.DownloadProgressChanged += Client_DownloadProgressChanged;
                client.DownloadFileCompleted += Client_DownloadFileCompleted;

                await client.DownloadFileTaskAsync(new Uri(fileUrl), dosyaAdi);
            }
        }

        private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            progressBar.Invoke((MethodInvoker)delegate
            {
                progressBar.Value = e.ProgressPercentage;
            });
        }

        private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                if (VerifyFileIntegrity(dosyaAdi, expectedHash))
                {
                    MessageBox.Show("Dosya indirme tamamlandı ve bütünlük doğrulandı!");
                }
                else
                {
                    MessageBox.Show("Dosya bütünlüğü doğrulanamadı. İndirilen dosya güvenli değil!");
                }
            }
            else
            {
                MessageBox.Show("Dosya indirme başarısız oldu. Hata: " + e.Error.Message);
            }
        }

        private bool VerifyFileIntegrity(string filePath, string expectedHash)
        {
            using (FileStream fileStream = File.OpenRead(filePath))
            {
                using (MD5 md5 = MD5.Create())
                {
                    byte[] hashBytes = md5.ComputeHash(fileStream);
                    string actualHash = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();

                    return string.Equals(expectedHash, actualHash, StringComparison.OrdinalIgnoreCase);
                }
            }
        }
    }
}