如何以百分比计算文件下载进度？

Question

我有这个方法：

HttpWebRequest request;
        void fileDownloadRadar(string uri, string fileName)
        {
            request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
            request.CookieContainer = new CookieContainer();
            request.AllowAutoRedirect = true;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.ContentType == "")
            {
                Logger.Write("ContentType is Empty download was not fine !!!!!");
            }
            if ((response.StatusCode == HttpStatusCode.OK ||
                response.StatusCode == HttpStatusCode.Moved ||
                response.StatusCode == HttpStatusCode.Redirect) &&
                response.ContentType.StartsWith("image", StringComparison.OrdinalIgnoreCase))
            {
                Logger.Write("ContentType is not empty meaning download is fine");
                using (Stream inputStream = response.GetResponseStream())
                using (Stream outputStream = File.OpenWrite(fileName))
                {
                    byte[] buffer = new byte[4096];
                    int bytesRead;
                    do
                    {
                        bytesRead = inputStream.Read(buffer, 0, buffer.Length);
                        outputStream.Write(buffer, 0, bytesRead);
                    } while (bytesRead != 0);

                }
                FinishWebRequest();
            }
            else
            {
                timer1.Stop();
                timer3.Start();
            }
        }

在这个方法中我想计算文件下载进度并将其报告给 form1 consturctor:

在 form1 构造函数中我做了：

fileDownloadRadar(remote_image_on_server, combinedTemp);
splash.UpdateProgressBar(

UpdateProgressBar 应该接受 int。在表格 splash 中，我更新了那里的 progressBar1。

我的问题是如何在fileDownloadRadar中实时计算下载进度以及如何将其报告给splash.UpdateProgressBar方法？

Answer 1

我认为您应该运行在单独的线程中下载文件，然后使用事件更新进度条。

您可以通过计算剩余字节数来查看进度。

这是包含您的问题解决方案的类似问题： C# download file with progress indicator and then install file

如何以百分比计算文件下载进度？

How can i calculate the progress of a file download in percentages?

.net

c#

winforms