// @nuget: HtmlAgilityPack

​

using System;

using HtmlAgilityPack;

using System.Net.Http;

using System.Threading.Tasks;

public class Program

{

    public async static Task Main()

    {

        HtmlWeb web = new HtmlWeb();

        // 获取随机的相册

        var htmlDocClass = web.Load("https://www.zhailm.com/fuli/meinvtupian/");

        var htmlNodesClass = htmlDocClass.DocumentNode.SelectNodes("//article[@class='excerpt']/header/h2/a");

        var ran = new Random();

        var classInfo = htmlNodesClass[ran.Next(htmlNodesClass.Count)];

        var uriClass = classInfo.Attributes["href"].Value;

​

        // 进入相册获取第一张图片URI

        var htmlDocImg = web.Load("https://www.zhailm.com" + uriClass);

        var htmlNodesImg = htmlDocImg.DocumentNode.SelectSingleNode("//article[@class='article-content']/a/img");

        var uriImg = htmlNodesImg.Attributes["src"].Value;

        var httpClient = new HttpClient();

        var pic = await httpClient.GetByteArrayAsync(uriImg);

        var picBase = Convert.ToBase64String(pic);

    }

}