在c#中使用httpclienthandler通过一个参数发布多个值

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

class Program
{
    static async Task Main(string[] args)
    {
        using (HttpClient client = new HttpClient())
        {
            // 构造要发布的参数
            var values = new Dictionary<string, string>
            {
                { "param1", "value1" },
                { "param2", "value2" },
                { "param3", "value3" }
            };

            // 将参数编码为URL编码形式
            var content = new FormUrlEncodedContent(values);

            // 发送POST请求，并将参数作为请求的内容
            var response = await client.PostAsync("http://example.com/api", content);

            // 处理响应
            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadAsStringAsync();
                Console.WriteLine(result);
            }
            else
            {
                Console.WriteLine("请求失败：" + response.StatusCode);
            }
        }
    }
}