如何在C#中使用body发出HTTPPost请求

using System.Net;
using System.IO;

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("请求的URL");
request.Method = "POST";

request.ContentType = "application/json"; // 根据实际情况设置内容类型
request.ContentLength = requestBody.Length; // requestBody为请求体的字符串长度

using (Stream stream = request.GetRequestStream())
{
    byte[] requestBodyBytes = Encoding.UTF8.GetBytes(requestBody); // requestBody为请求体的字符串
    stream.Write(requestBodyBytes, 0, requestBodyBytes.Length);
}

using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
    using (Stream responseStream = response.GetResponseStream())
    {
        using (StreamReader reader = new StreamReader(responseStream))
        {
            string responseContent = reader.ReadToEnd();
            // 处理响应内容
        }
    }
}