c#用HttpWebRequest发送POST请求并验证是否能获得返回值返回值返回json然后判断json里code是否为1

以下是使用C#的HttpWebRequest发送POST请求并验证返回值的示例代码：

using System;
using System.IO;
using System.Net;
using System.Text;
using Newtonsoft.Json.Linq;

public class Program
{
    public static void Main(string[] args)
    {
        string url = "http://example.com/api";
        string postData = "{\"param1\": \"value1\", \"param2\": \"value2\"}";

        string responseJson = SendPostRequest(url, postData);
        int code = GetCodeFromJson(responseJson);

        if (code == 1)
        {
            Console.WriteLine("Code is 1");
        }
        else
        {
            Console.WriteLine("Code is not 1");
        }
    }

    public static string SendPostRequest(string url, string postData)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "application/json";

        byte[] dataBytes = Encoding.UTF8.GetBytes(postData);
        request.ContentLength = dataBytes.Length;

        using (Stream requestBody = request.GetRequestStream())
        {
            requestBody.Write(dataBytes, 0, dataBytes.Length);
        }

        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {
            using (Stream responseBody = response.GetResponseStream())
            {
                using (StreamReader reader = new StreamReader(responseBody, Encoding.UTF8))
                {
                    return reader.ReadToEnd();
                }
            }
        }
    }

    public static int GetCodeFromJson(string json)
    {
        JObject jsonObject = JObject.Parse(json);
        return (int)jsonObject["code"];
    }
}

在上面的代码中，url是要发送POST请求的API的URL，postData是要发送的JSON数据。SendPostRequest方法发送POST请求并返回API的响应。GetCodeFromJson方法从返回的JSON中提取code值并返回。

你可以根据实际情况修改url和postData的值，并根据code的值来进行相应的处理