C# HttpClient 不发送 POST 变量

Question

我正在尝试制作一个应用程序，它将向 https://owlexpress.kennesaw.edu/prodban/bwckschd.p_get_crse_unsec 发送 POST 请求，其中包含一些信息和 return 一个 class 列表。

你可以到这里去搜索"I'm using Fall 2015, MATH, Course 1190"。 https://owlexpress.kennesaw.edu/prodban/bwckschd.p_disp_dyn_sched

当我运行下面的代码时，它会将它 return 的内容输出到进入网络浏览器组件的字符串。它显示：

Class Schedule Search    
Fall Semester 2015
Mar 31, 2015
Stop You must select at least ONE subject .

我使用 Chrome 调试找到 POST 值并将它们设置为我正常使用网站时的值。我什至包括了一些饼干以备不时之需。

编辑：

好的，新一期。我使用了一个有效的浏览器并得到了这个："term_in=201508&sel_subj=dummy&sel_day=dummy&sel_schd=dummy&sel_insm=dummy&sel_c‌amp=dummy&sel_levl=dummy&sel_sess=dummy&sel_instr=dummy&sel_ptrm=dummy&sel_attr=d‌ummy&sel_subj=MATH&sel_crse=1190&sel_title=&sel_insm=%25&sel_from_cred=&sel_to_cr‌ed=&sel_camp=%25&sel_levl=%25&sel_ptrm=%25&sel_instr=%25&begin_hh=0&begin_mi=0&be‌gin_ap=a&end_hh=0&end_mi=0&end_ap=a"

不过我无法发送它，因为它使用了一些名称两次，例如 sel_subj（这些是我在字典中的键值）

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Net.Http;
using System.Net;

namespace ClassChecker
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    methods methods1 = new methods();

    public MainWindow()
    {
        InitializeComponent();

    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {            
        string temp = methods1.getData2();
        Console.ReadLine();
        webBrowser.NavigateToString(temp);            
    }
}


public class methods
{

    public string getData2()
    {
        var cookieContainer = new CookieContainer();
        using (var handler = new HttpClientHandler() { CookieContainer = cookieContainer })
        using (var client = new HttpClient(handler))
        {
            client.BaseAddress = new Uri("https://owlexpress.kennesaw.edu");

             var values = new Dictionary<string, string>
            {
               { "sel_subj", "MATH" },
               { "term_in", "201508" },
               { "sel_day", "dummy"},
               { "sel_schd", "dummy"},
               { "sel_insm", "%"},
               { "sel_camp", "%"},
               { "sel_levl", "%"},
               { "sel_sess", "dummy"},
               { "sel_instr", "%"},
               { "sel_ptrm", "%"},
               { "sel_attr", "dummy"},                   
               { "sel_crse", "1190" },
               { "sel_title", "" },
               { "sel_from_cred", "" },
               { "sel_to_cred", "" },
               { "begin_hh", "0" },
               { "begin_mi", "0" },
               { "begin_ap", "a" },
               { "end_hh", "0" },
               { "end_mi", "0" },
               { "end_ap", "a" }

            };
            var content = new FormUrlEncodedContent(values);

            cookieContainer.Add(client.BaseAddress, new Cookie("SESSID", "MFlIU0VSMTgxNjYx"));
            cookieContainer.Add(client.BaseAddress, new Cookie("BIGipServerowlexpress-all", "2239289986.0.0000"));

            client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("text/html"));
            var result = client.PostAsync("/prodban/bwckschd.p_get_crse_unsec", content).Result;
            string resultContent = result.Content.ReadAsStringAsync().Result;                
            MessageBox.Show(result.Headers.ToString());
            return resultContent;
        }

    }

}

}

Answer 1

根据我们在评论中的讨论，您要发布的服务需要一组具有 'dummy' 值的参数和另一组具有实际值的相同参数。

如果您使用 NameValueCollection 作为进入 FormUrlEncodedContent 构造函数的参数，您将能够使用重复键。然后它应该工作

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