C# 模擬表單post請求 from-data

#region POST from-data 表單post請求
        public class FormItemModel
        {
            /// <summary>
            /// 表單鍵，request["key"]
            /// </summary>
            public string Key { set; get; }
            /// <summary>
            /// 表單值,上傳文件時忽略，request["key"].value
            /// </summary>
            public string Value { set; get; }
            /// <summary>
            /// 是否是文件
            /// </summary>
            public bool IsFile
            {
                get
                {
                    if (FileContent == null || FileContent.Length == 0)
                        return false;

                    if (FileContent != null && FileContent.Length > 0 && string.IsNullOrWhiteSpace(FileName))
                        throw new Exception("上傳文件時 FileName 屬性值不能為空");
                    return true;
                }
            }
            /// <summary>
            /// 上傳的文件名
            /// </summary>
            public string FileName { set; get; }
            /// <summary>
            /// 上傳的文件內容
            /// </summary>
            public Stream FileContent { set; get; }
        }
        /// <summary>
        /// 使用Post方法獲取字符串結果
        /// </summary>
        /// <param name="url"></param>
        /// <param name="formItems">Post表單內容</param>
        /// <param name="cookieContainer"></param>
        /// <param name="timeOut">默認20秒</param>
        /// <param name="encoding">響應內容的編碼類型（默認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 初始化請求對象
            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);
            //請求流
            var postStream = new MemoryStream();
            #region 處理Form表單請求內容
            //是否用Form上傳文件
            var formUploadFile = formItems != null && formItems.Count > 0;
            if (formUploadFile)
            {
                //文件數據模板
                string fileFormdataTemplate =
                    "\r\n--" + boundary +
                    "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"" +
                    "\r\nContent-Type: application/octet-stream" +
                    "\r\n\r\n";
                //文本數據模板
                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;
                    if (item.IsFile)
                    {
                        //上傳文件
                        formdata = string.Format(
                            fileFormdataTemplate,
                            item.Key, //表單鍵
                            item.FileName);
                    }
                    else
                    {
                        //上傳文本
                        formdata = string.Format(
                            dataFormdataTemplate,
                            item.Key,
                            item.Value);
                    }

                    //統一處理
                    byte[] formdataBytes = null;
                    //第一行不需要換行
                    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);

                    //寫入文件內容
                    if (item.FileContent != null && item.FileContent.Length > 0)
                    {
                        using (var stream = item.FileContent)
                        {
                            byte[] buffer = new byte[1024];
                            int bytesRead = 0;
                            while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
                            {
                                postStream.Write(buffer, 0, bytesRead);
                            }
                        }
                    }
                }
                //結尾
                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 輸入二進制流
            if (postStream != null)
            {
                postStream.Position = 0;
                //直接寫入流
                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();//關閉文件訪問
            }
            #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;
                }
            }
        }
        #endregion

傳入參數：

var url = "http://127.0.0.1/testformdata.aspx?aa=1&bb=2&ccc=3";
var log1=@"D:\temp\log1.txt";
var log2 = @"D:\temp\log2.txt";
var formDatas = new List<Grass.Net.FormItemModel>();
//添加文件
formDatas.Add(new Grass.Net.FormItemModel()
{
    Key="log1",
    Value="",
    FileName = "log1.txt",
    FileContent=File.OpenRead(log1)
});
formDatas.Add(new Grass.Net.FormItemModel()
{
    Key = "log2",
    Value = "",
    FileName = "log2.txt",
    FileContent = File.OpenRead(log2)
});
//添加文本
formDatas.Add(new Grass.Net.FormItemModel()
{
    Key = "id",
    Value = "id-test-id-test-id-test-id-test-id-test-"
});
formDatas.Add(new Grass.Net.FormItemModel()
{
    Key = "name",
    Value = "name-test-name-test-name-test-name-test-name-test-"
});
//提交表單
var result = PostForm(url, formDatas);

 

節選自：https://www.cnblogs.com/yanxh/p/10794969.html