C# 实现下载文件并自动检测文件名(带进度反馈)

表示最近公司升级面板，要搞个远程下载功能，本来想偷懒直接百度Copy份代码直接用，结果.........找了好几页找不到符合要求的.........

无奈，只能自己动手写了

其实要求很简单就是下载远程文件并自动检测文件名称，但不知为啥BD上找不到..........

好了，不吹水了，直接看代码

        private void HttpDownloadFile(string url, string path, bool overwrite, Action<string, long, long> callback = null)
        {
            // 设置参数
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            //发送请求并获取相应回应数据
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //获取文件名
            string fileName = response.Headers["Content-Disposition"];//attachment;filename=FileName.txt
            if (string.IsNullOrEmpty(fileName))
                fileName = response.ResponseUri.Segments[response.ResponseUri.Segments.Length - 1];
            else
                fileName = fileName.Remove(0, fileName.IndexOf("filename=") + 9);
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            using (Stream responseStream = response.GetResponseStream())
            {
                long totalLength = response.ContentLength;
                //创建本地文件写入流
                using (Stream stream = new FileStream(Path.Combine(path, fileName), overwrite ? FileMode.Create : FileMode.CreateNew))
                {
                    byte[] bArr = new byte[1024];
                    int size;
                    while ((size = responseStream.Read(bArr, 0, bArr.Length)) > 0)
                    {
                        stream.Write(bArr, 0, size);
                        callback?.Invoke(fileName, totalLength, stream.Length);
                    }
                } 
            }
        }

我相信大部分大部分童鞋一眼就能看懂各个参数意思，不过为了避免部分童鞋看不懂我还是说下吧

照旧用表格