C# 批量替换html中的图片 示例

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using HtmlAgilityPack;
using System.Text.RegularExpressions;
using System.Net;

namespace papapa
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private static int j = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            j = 0;
            string tou = textBox1.Text;
            string html = qian.Text;
            HtmlAgilityPack.HtmlDocument htmlDocument = new HtmlAgilityPack.HtmlDocument();
            htmlDocument.LoadHtml(html);
            var lilist = htmlDocument.DocumentNode.SelectNodes("//li");
            for(int i = 0;i<lilist.Count;i  ) {
                string Ys = "";
                string script = "<script type='text/html' id='temp_00" i "'>\r\n";
                string foots = "</script>";
                Ys = script   lilist[i].InnerHtml  "\r\n"   foots  "\r\n";
 
              var lio=  GetString(lilist[i].InnerHtml, @"http(s)?://([\w-] \.) [\w-] (/[\w- ./?%&=]*)?");
                string paths = "";
                foreach (Match m in lio) {
                    string houzhui = m.Value.Remove(0,m.Length-3);
                    if (houzhui != "jpg" && houzhui != "png" && houzhui != "gif" && houzhui != "peg") {
                        houzhui = "png";
                    }
                    if (m.Value.Remove(0, m.Length - 4) == "jpeg") {
                        houzhui = "jpeg";
                    }
                    paths = GetImg(m.Value, tou "_"   j.ToString() "."   houzhui);
                  Ys =  Ys.Replace(m.Value, textBox2.Text  paths);
                }
                hou.AppendText(Ys);
            }

        }


        public string GetImg(string url,string paths) {
            j  ;
            string m_keleyiPicture = @"D:\images\"  paths;
            //根据网址下载文件
            WebClient mywebclient = new WebClient();
            mywebclient.DownloadFile(url, m_keleyiPicture);
            return paths;
        }
        public  MatchCollection GetString(string str, string zz)
        {
            Regex reg = new Regex(zz);
            MatchCollection match = reg.Matches(str);
            return match;
        }
        private void hou_KeyDown(object sender, KeyEventArgs e)
        {

            if (e.Modifiers == Keys.Control && e.KeyCode == Keys.A)
            {
                ((TextBox)sender).SelectAll();
            }
        }
    }
}