C#获取网页内容并返回内容

可以使用C#中的HttpWebRequest和HttpWebResponse类来获取网页内容，以下是示例代码：

using System;
using System.IO;
using System.Net;
using System.Text;

public static string GetWebPageContent(string url)
{
    string content = "";
    try
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "GET";
        request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36";
        request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream stream = response.GetResponseStream();
        StreamReader streamReader = new StreamReader(stream, Encoding.UTF8);
        content = streamReader.ReadToEnd();

        streamReader.Close();
        stream.Close();
        response.Close();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }

    return content;
}

调用方法：

string url = "https://www.example.com";
string content = GetWebPageContent(url);
Console.WriteLine(content);