从Windows Form C#发送Post请求

using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace WindowsFormApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            using (HttpClient client = new HttpClient())
            {
                var data = new Dictionary<string, string>
                {
                    { "key1", "value1" },
                    { "key2", "value2" }
                };

                var content = new FormUrlEncodedContent(data);

                var response = await client.PostAsync("http://example.com/api", content);

                var responseString = await response.Content.ReadAsStringAsync();

                // 处理响应数据
            }
        }
    }
}