[C#][下載] http下載文件

原文:https://www.cnblogs.com/testsec/p/6095713.html

/// <summary>
        /// http下載文件
        /// </summary>
        /// <param name="url">下載文件地址</param>
        /// <param name="path">文件存放地址，包含文件名</param>
        /// <returns></returns>
        public bool HttpDownload(string url, string path)
        {
            string tempPath = System.IO.Path.GetDirectoryName(path) + @"\temp";
            System.IO.Directory.CreateDirectory(tempPath);  //創建臨時文件目錄
            string tempFile = tempPath + @"\" + System.IO.Path.GetFileName(path) + ".temp"; //臨時文件
            if (System.IO.File.Exists(tempFile))
            {
                System.IO.File.Delete(tempFile);    //存在則刪除
            }
            try
            {
                FileStream fs = new FileStream(tempFile, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
                // 設置參數
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                //發送請求並獲取相應迴應數據
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序纔開始向目標網頁發送Post請求
                Stream responseStream = response.GetResponseStream();
                //創建本地文件寫入流
                //Stream stream = new FileStream(tempFile, FileMode.Create);
                byte[] bArr = new byte[1024];
                int size = responseStream.Read(bArr, 0, (int)bArr.Length);
                while (size > 0)
                {
                    //stream.Write(bArr, 0, size);
                    fs.Write(bArr, 0, size);
                    size = responseStream.Read(bArr, 0, (int)bArr.Length);
                }
                //stream.Close();
                fs.Close();
                responseStream.Close();
                System.IO.File.Move(tempFile, path);
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }