C# 获取网页上指定的元素

直接上代码

//using System;
//using System.Net.Http;
//using System.Threading.Tasks;
//using HtmlAgilityPack;
//using Newtonsoft.Json;
 
//class Program
//{
//    static async Task Main(string[] args)
//    {
//        using var httpClient = new HttpClient();
//        var url = "https://go-upc.com/search?q=776545980144"; // 替换为你要获取数据的网页地址
//        var response = await httpClient.GetAsync(url);
//        var htmlContent = await response.Content.ReadAsStringAsync();
 
//        var htmlDocument = new HtmlDocument();
//        htmlDocument.LoadHtml(htmlContent);
 
//        var selectedNode = htmlDocument.DocumentNode.SelectSingleNode("//div[@class='target-class']");
//        if (selectedNode != null)
//        {
//            var data = selectedNode.InnerText; // 提取节点内部文本数据
 
//            var jsonData = new { Data = data };
//            var jsonResult = JsonConvert.SerializeObject(jsonData);
 
//            Console.WriteLine(jsonResult); // 返回JSON数据给前端
//        }
//    }
//}
 
 
using System;
using System.Net.Http;
using System.Threading.Tasks;
using HtmlAgilityPack;
using Newtonsoft.Json;
 
class Program
{
    static async Task Main(string[] args)
    {
        using var httpClient = new HttpClient();
        var url = "https://go-upc.com/search?q=776545980144"; // 替换为你要获取数据的网页地址
        var response = await httpClient.GetAsync(url);
        var htmlContent = await response.Content.ReadAsStringAsync();
 
        var htmlDocument = new HtmlDocument();
        htmlDocument.LoadHtml(htmlContent);
 
        var productNameNode = htmlDocument.DocumentNode.SelectSingleNode("//h1[@class='product-name']");
        var eanNode = htmlDocument.DocumentNode.SelectSingleNode("//td[@class='metadata-label'][contains(text(), 'EAN')]/following-sibling::td");
        var upcNode = htmlDocument.DocumentNode.SelectSingleNode("//td[@class='metadata-label'][contains(text(), 'UPC')]/following-sibling::td");
        var descriptionNode = htmlDocument.DocumentNode.SelectSingleNode("//h2[contains(text(), 'Description')]/following-sibling::span");
 
        if (productNameNode != null && eanNode != null && upcNode != null && descriptionNode!=null)
        {
            var productName = productNameNode.InnerText.Trim();
            var ean = eanNode.InnerText.Trim();
            var upc = upcNode.InnerText.Trim();
            var description = descriptionNode.InnerText.Trim();
 
            var jsonData = new
            {
                ProductName = productName,
                EAN = ean,
                UPC = upc,
                Description = description
            };
 
            var jsonResult = JsonConvert.SerializeObject(jsonData);
 
            Console.WriteLine(jsonResult); // 返回JSON数据给前端
            Console.ReadLine();
        }
    }
}