C#以from的形式post文件及参数

问题遇到的现象和发生背景

公司要调用一个JAVA的文件上传接口，并接收返回值。给的示例代码是JAVA的，但项目使用C#编写，我对JAVA也是一窍不通，JAVA的类和方法也看不太明白。麻烦各位谁能帮我把JAVA的示例代码翻译一个C#功能相同吗。万分感谢

用代码块功能插入代码，请勿粘贴截图

JAVA示例：

public class MainUI {
 
 public static void main(String[] args) throws Exception {
 // 企业 id
 String enterpriseId = "xxxxxx";
 // 加密后的时间戳
 String token = 
"N+zE3m6KpyRbIwKMZlwuXvRYg7gW368PhJE/iuOHq5H3BhH/57iQ7p7ICiRzua0tYydLxbRZH4Rj3qDz7fkaBhT
G9eQ6V6+zwDEDK68E8AD9/gQUuU6ViI6pLk6eyTzzKRMWJc0NZoUIGg7sPGkhBfVhUl7ortHNLSB+FJxzFEg=";
 String url = "http://xxxxx/merchandise/uploadReport";
 File file = new File("/Users/zhangwenbin/Documents/测试.pdf");
 FileInputStream inputStream = new FileInputStream(file);
 CloseableHttpClient httpClient = HttpClientBuilder.create().build();
 HttpPost httpPost = new HttpPost(url);
 MultipartEntityBuilder builder = MultipartEntityBuilder.create();
 builder.addBinaryBody("file", inputStream, ContentType.MULTIPART_FORM_DATA, "
测试.pdf")
 .addTextBody("token", token)
 .addTextBody("enterpriseId", enterpriseId);
 httpPost.setEntity(builder.build());
 // 获取响应内容
 HttpResponse response = httpClient.execute(httpPost);
 if(response.getStatusLine().getStatusCode() == 200){
 if (null != response.getEntity()) {
 // 将响应内容转换为字符串
 String json = EntityUtils.toString(response.getEntity(), 
Charset.forName("UTF-8"));
 JSONObject responseJson = JSON.parseObject(json);
 Boolean isSuccess = (Boolean) responseJson.get("success");
 if(isSuccess){
 JSONObject module = (JSONObject) responseJson.get("module");
 String key = (String) module.get("key");
 System.out.println(module.toJSONString());
 }
 }
 }
 } }
我的解答思路和尝试过的方法

我自己用C#的MultipartFormDataContent凭着猜测模拟的代码

/// 
        /// 上传file到接口
        /// 
        /// 
        /// 
        /// 
        /// 
        /// 
        private string RequestFilePost(string url, string fileName, string filePath,string EnterpriseId)
        {
            try
            {
                TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
                var timeStamp = Convert.ToInt64(ts.TotalMilliseconds).ToString();
                string token = RasEncrypt(timeStamp, PUBLIC_KEY);

                //1
                var postContent = new MultipartFormDataContent();
                postContent.Headers.Add("ContentType", $"multipart/form-data");
                postContent.Add(new StringContent(token), "token");
                postContent.Add(new StringContent(EnterpriseId), "enterpriseId");
                postContent.Add(new ByteArrayContent(File.ReadAllBytes(filePath)), "file");
                string result = "";
                try
                {
                    HttpClient client = new HttpClient();
                    HttpResponseMessage response1 = client.PostAsync(url, postContent).Result;
                    result = response1.Content.ReadAsStringAsync().Result;
                }
                catch (Exception ex)
                {
                    result = ex.Message;
                }
                return result;
            }
          }
我想要达到的结果

根据JAVA示例弄一个C#功能相同的方法。

已解决。我特意问了一下我们专门弄JAVA的同事。CloseableHttpClient 这玩意就是一个自带关闭的HttpClicent。还有builder.addBinaryBody("file", inputStream, ContentType.MULTIPART_FORM_DATA, "测试.pdf").addTextBody("token", token).addTextBody("enterpriseId", enterpriseId);这玩意的意思，就是模拟一个form的file文件流加token和enterpriseId提交key-value对。所以我写的C#代码正常就完全没问题。于是跟接口那边沟通，是接口那边出的问题。我也是醉了。。。

看代码功能不难，就是打开文件流，然后通过http发送post请求给服务端，再接收回应，将key值打印出来
具体实现可参考C#post上传文件，post发送文件(Http Post)，带其他参数_程序猿够钟的博客-CSDN博客_c# post 发送文件

string postData = "参数"; // 要发放的数据 
            string postUrl = "地址";
            byte[] byteArray = Encoding.Default.GetBytes(postData); //转化
            HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
            webReq.Method = "POST";
            webReq.ContentType = "application/x-www-form-urlencoded";
            webReq.ContentLength = byteArray.Length;
            Stream newStream = webReq.GetRequestStream();
            newStream.Write(byteArray, 0, byteArray.Length);//写入参数
            newStream.Close();
            HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.Default);
            this.Label1.Text = sr.ReadToEnd();
            sr.Close();
            response.Close();
            newStream.Close();