AsyncAwaitDemo2/HttpUtil.cs

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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;

namespace Utils
{
    /// <summary>
    /// Http上传下载文件
    /// </summary>
    public class HttpUtil
    {
        #region HttpDownloadFile 下载文件
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="url">下载文件url路径</param>
        /// <param name="cookie">cookie</param>
        public static MemoryStream HttpDownloadFile(string url, CookieContainer cookie = null, WebHeaderCollection headers = null)
        {
            try
            {
                // 设置参数
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                request.Method = "GET";
                request.CookieContainer = cookie;

                if (headers != null)
                {
                    foreach (string key in headers.Keys)
                    {
                        request.Headers.Add(key, headers[key]);
                    }
                }

                //发送请求并获取相应回应数据
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求
                Stream responseStream = response.GetResponseStream();

                //创建写入流
                MemoryStream stream = new MemoryStream();

                byte[] bArr = new byte[10240];
                int size = responseStream.Read(bArr, 0, (int)bArr.Length);
                while (size > 0)
                {
                    stream.Write(bArr, 0, size);
                    size = responseStream.Read(bArr, 0, (int)bArr.Length);
                }
                stream.Seek(0, SeekOrigin.Begin);
                responseStream.Close();

                return stream;
            }
            catch (Exception ex)