在C#中使用HttpWebRequest进行带参数的Post

using System.Net;

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://example.com/api");

request.Method = "POST";
string postData = "param1=value1&param2=value2";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;

using (Stream dataStream = request.GetRequestStream())
{
    dataStream.Write(byteArray, 0, byteArray.Length);
}

using (WebResponse response = request.GetResponse())
{
    using (Stream responseStream = response.GetResponseStream())
    {
        StreamReader reader = new StreamReader(responseStream);
        string responseText = reader.ReadToEnd();
        // 处理响应数据
    }
}