c# 发送post

请求示例：

using System.Net;
using System.IO;
using System.Text;

public string SendPostRequest(string url, string data)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "POST";
    request.ContentType = "application/json";
    byte[] byteData = Encoding.UTF8.GetBytes(data);
    request.ContentLength = byteData.Length;
    using (Stream requestStream = request.GetRequestStream())
    {
        requestStream.Write(byteData, 0, byteData.Length);
    }
    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    {
        using (Stream responseStream = response.GetResponseStream())
        {
            using (StreamReader reader = new StreamReader(responseStream, Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
    }
}

使用示例：

string url = "http://example.com/api";
string data = "{\"name\":\"John\", \"age\":30}";

string result = SendPostRequest(url, data);
Console.WriteLine(result);
``