C# 使用HttpClient获取cookie

妖狐艹你老母 2022-02-26 03:26 1081阅读 0赞

代码如下：

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Net;
    using System.Net.Http;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    
    namespace WindowsFormsApp1
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            public string result_cookie = "";
            private void  button1_ClickAsync(object sender, EventArgs e)
            {
                result_cookie = getcookie();
                
                //此时无法获得cookie，因为await会跳到这里
                //do_someting(result_cookie);
            }
    
            public async Task<String> getcookie()
            {
                try
                {
                    StringBuilder sb_cookie = new StringBuilder();
                    var url = "www.baidu.com";
                    CookieContainer cookieContainer = new CookieContainer();
                    var uri = new Uri(url);
                    var handler = new HttpClientHandler();
                    handler.CookieContainer = cookieContainer;
                    HttpClient client = new HttpClient(handler);
                    await client.GetAsync(uri);
                    List<Cookie> cookies = cookieContainer.GetCookies(uri).Cast<Cookie>().ToList();
    
                    foreach (var item in cookies)
                    {
                        sb_cookie.Append(item.Name);
                        sb_cookie.Append("=");
                        sb_cookie.Append(item.Value);
                        sb_cookie.Append(";");
    
                    }
                    result_cookie = sb_cookie.ToString();
                    
                    //此时才可用cookie
                    //do_someting(result_cookie);
                }
                catch
                {
                    return String.Empty;
                }
                return result_cookie ;
            }
        }
    }

前提是访问的url必须有设置cookie的行为，否则为空。