从C#调用POST方法

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POST请求的内容
            var postData = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("key1", "value1"),
                new KeyValuePair<string, string>("key2", "value2")
            });

            // 发送POST请求
            HttpResponseMessage response = await client.PostAsync("http://example.com/api", postData);

            // 获取响应内容
            string responseContent = await response.Content.ReadAsStringAsync();

            // 处理响应内容
            Console.WriteLine(responseContent);
        }
    }
}