c#关于 做接口开发时，遇到的Form表单提交数据

遇到接口开发时，对接客户要求发送请求数据为form表单提交，以下是经过大佬们写过类似整理出来适合我自己用的一套

 public class FormItemModel
    {
        /// <summary>
        ///主键
        /// </summary>
        public string Key { set; get; }
        /// <summary>
        /// 值
        /// </summary>
        public string Value { set; get; }
        /// <summary>
        /// 值
        /// </summary>
        public long Values { get; set; }
    }

private void btn_Click(object sender, EventArgs e)
{
var url = "*******************************";
long _ts = ConvertDataTimeToLong(DateTime.Now);
string _appSecret = "*************";
string _appId = "****************";
string _tokens = "";//加密
string _Num = "123";
string _Code = "111";
string _idNo = "1111";
var formDatas = new List<FormItemModel>();

formDatas.Add(new FormItemModel()
{
Key = "appId",
Value = _appId
});
formDatas.Add(new FormItemModel()
{
Key = "ts",
Values = _ts
});
formDatas.Add(new FormItemModel()
{
Key = "tokens",
Value = _tokens
});
formDatas.Add(new FormItemModel()
{
Key = "Num",
Value = _Num
});
formDatas.Add(new FormItemModel()
{
Key = "Code",
Value = _Code
});
formDatas.Add(new FormItemModel()
{
Key = "idNo",
Value = _idNo
});
//提交表单
var result = HTExamDocking.PostForm(url, formDatas);
if (result != null)
{
//MessageBox.Show("成功");
}
}

 /// <summary>
        /// 使用Post方法获取字符串结果
        /// </summary>
        /// <param name="url"></param>
        /// <param name="formItems">Post表单内容</param>
        /// <param name="cookieContainer"></param>
        /// <param name="timeOut">默认20秒</param>
        /// <param name="encoding">响应内容的编码类型（默认utf-8）</param>
        /// <returns></returns>
        public static string PostForm(string url, List<FormItemModel> formItems, CookieContainer cookieContainer = null, string refererUrl = null, Encoding encoding = null, int timeOut = 20000)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            #region 初始化请求对象
            request.Method = "POST";
            request.Timeout = timeOut;
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            request.KeepAlive = true;
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
            if (!string.IsNullOrEmpty(refererUrl))
                request.Referer = refererUrl;
            if (cookieContainer != null)
                request.CookieContainer = cookieContainer;
            #endregion

            string boundary = "----" + DateTime.Now.Ticks.ToString("x");//分隔符
            request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
            //请求流
            var postStream = new MemoryStream();
            #region 处理Form表单请求内容
            //是否用Form上传文件
            var formUploadFile = formItems != null && formItems.Count > 0;
            if (formUploadFile)
            {
                //文件数据模板
                string fileFormdataTemplate =
                    "\r\n--" + boundary +
                    "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"" +
                    "\r\nContent-Type: application/octet-stream" +
                    "\r\n\r\n";
                //文本数据模板
                string dataFormdataTemplate =
                    "\r\n--" + boundary +
                    "\r\nContent-Disposition: form-data; name=\"{0}\"" +
                    "\r\n\r\n{1}";
                foreach (var item in formItems)
                {
                    string formdata = null;

                    //上传文本
                    if (item.Value != null)
                    {
                        formdata = string.Format(
                        dataFormdataTemplate,
                        item.Key,
                        item.Value);
                    }
                    else
                    {
                        formdata = string.Format(
                        dataFormdataTemplate,
                        item.Key,
                        item.Values);
                    }
                    //统一处理
                    byte[] formdataBytes = null;
                    //第一行不需要换行
                    if (postStream.Length == 0)
                        formdataBytes = Encoding.UTF8.GetBytes(formdata.Substring(2, formdata.Length - 2));
                    else
                        formdataBytes = Encoding.UTF8.GetBytes(formdata);
                    postStream.Write(formdataBytes, 0, formdataBytes.Length);
                }
                //结尾
                var footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
                postStream.Write(footer, 0, footer.Length);

            }
            else
            {
                request.ContentType = "application/x-www-form-urlencoded";
            }
            #endregion

            request.ContentLength = postStream.Length;

            #region 输入二进制流
            if (postStream != null)
            {
                postStream.Position = 0;
                //直接写入流
                Stream requestStream = request.GetRequestStream();

                byte[] buffer = new byte[1024];
                int bytesRead = 0;
                while ((bytesRead = postStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    requestStream.Write(buffer, 0, bytesRead);
                }

                ////debug
                //postStream.Seek(0, SeekOrigin.Begin);
                //StreamReader sr = new StreamReader(postStream);
                //var postStr = sr.ReadToEnd();
                postStream.Close();//关闭文件访问
            }
            #endregion

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (cookieContainer != null)
            {
                response.Cookies = cookieContainer.GetCookies(response.ResponseUri);
            }

            using (Stream responseStream = response.GetResponseStream())
            {
                using (StreamReader myStreamReader = new StreamReader(responseStream, encoding ?? Encoding.UTF8))
                {
                    string retString = myStreamReader.ReadToEnd();
                    return retString;
                }
            }
        }