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wxr

2023-03-31 7e42cc13a14b7de31c9f5d5c61cdf24f3246335d

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
 
 
namespace Shared.Net
{
    /// <summary>
    /// 异步下载图片
    /// </summary>
    public class DownLoadImageAsync
    {
        /// <summary>
        /// 当前的webClient对象
        /// </summary>
        private System.Net.WebClient webClient = new WebClient();
        /// <summary>
        /// 用户名
        /// </summary>
        public string Name;
        /// <summary>
        /// 密码
        /// </summary>
        public string Password;
        /// <summary>
        /// 地址
        /// </summary>
        private Uri uri;
        /// <summary>
        /// 异步下载图片
        /// </summary>
        /// <param name="uri">链接地址</param>
        /// <param name="name">登记用户名</param>
        /// <param name="password">密码</param>
        public DownLoadImageAsync(Uri uri,string name,string password)
        {
            this.uri = uri;
            this.Name = name;
            this.Password = password;
        }
        /// <summary>
        /// 下载进度变化事件
        /// </summary>
        public  event  DownloadProgressChangedEventHandler  DownloadProgressChanged;
 
        /// <summary>
        /// 下载完成
        /// </summary>
        public event DownloadDataCompletedEventHandler DownloadDataCompleted;
 
        /// <summary>
        /// 开始异步下载
        /// </summary>
        public async  void StartDownloadImageAsync()
        {
            // var url = new Uri("http://192.168.2.210/tmpfs/auto.jpg");
 
            webClient.DownloadProgressChanged += HandleDownloadProgressChanged;
            webClient.DownloadDataCompleted += webClient_DownloadDataCompleted;
 
            try
            {
                string newValue = Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes(Name + ":" + Password));
 
                webClient.Headers.Add("Content-Type", "image/webp,*/*;q=0.8");
                webClient.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");
                webClient.Headers.Add("Authorization", "Basic " + newValue);
                await webClient.DownloadDataTaskAsync(this.uri);
            }
            catch 
            {
                DownloadDataCompleted("异步完成", null);
            }
 
        }
 
 
        /// <summary>
        /// 下载图片完成
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void webClient_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
        {
            if (DownloadDataCompleted != null)
            {
                DownloadDataCompleted(sender, e);
            }
        }
 
        /// <summary>
        /// 下载进度变化
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void HandleDownloadProgressChanged (object sender, DownloadProgressChangedEventArgs e)
        {
            if (DownloadProgressChanged != null)
            {
                DownloadProgressChanged(sender, e);
            }
        }
 
        /// <summary>
        /// 取消下载
        /// </summary>
        public void CancelDownload()
        {
            webClient.CancelAsync();
            webClient.DownloadProgressChanged -= HandleDownloadProgressChanged;
        }
 
 
    }
}