c#客户端上传文件到服务器

场景描述：
特别声明
以下代码也是我从网络上复制的别人的，但是一开始跑我这边有点报错就稍微调整了一下。同时也是记录一下
服务端接口接受一个客户端上传的文件流后进行后续的业务操作。

客户端：
Modle类：

public class UploadParameterType
    {
        public UploadParameterType()
        {
            FileNameKey = "file";
            Encoding = Encoding.UTF8;
            PostParameters = new Dictionary();
        }
        /// 

        /// 上传地址
        /// 
        public string Url { get; set; }
        /// 

        /// 文件名称key
        /// 
        public string FileNameKey { get; set; }
        /// 

        /// 文件名称value
        /// 
        public string FileNameValue { get; set; }
        /// 

        /// 编码格式
        /// 
        public Encoding Encoding { get; set; }
        /// 

        /// 上传文件的流
        /// 
        public Stream UploadStream { get; set; }
        /// 

        /// 上传文件 携带的参数集合
        /// 
        public IDictionary PostParameters { get; set; }
    }

HTTP请求方法

 public static string Execute(UploadParameterType parameter)
        {
            // 1.分界线
            string boundary = string.Format("----{0}", DateTime.Now.Ticks.ToString("x")),       // 分界线可以自定义参数
                beginBoundary = string.Format("--{0}rn", boundary),
                endBoundary = string.Format("rn--{0}--rn", boundary);
            byte[] beginBoundaryBytes = parameter.Encoding.GetBytes(beginBoundary),
                endBoundaryBytes = parameter.Encoding.GetBytes(endBoundary);
            byte[] postBytes = new byte[] { };
            using (MemoryStream memoryStream = new MemoryStream())
            {
                // 2.组装开始分界线数据体 到内存流中
                memoryStream.Write(beginBoundaryBytes, 0, beginBoundaryBytes.Length);
                // 3.组装 上传文件附加携带的参数 到内存流中
                if (parameter.PostParameters != null && parameter.PostParameters.Count > 0)
                {
                    foreach (KeyValuePair keyValuePair in parameter.PostParameters)
                    {
                        string parameterHeaderTemplate = string.Format("Content-Disposition: form-data; name="{0}"rnrn{1}rn{2}", keyValuePair.Key, keyValuePair.Value, beginBoundary);
                        byte[] parameterHeaderBytes = parameter.Encoding.GetBytes(parameterHeaderTemplate);
                        memoryStream.Write(parameterHeaderBytes, 0, parameterHeaderBytes.Length);
                    }
                }
                // 4.组装文件头数据体 到内存流中
                string fileHeaderTemplate = string.Format("Content-Disposition: form-data; name="{0}"; filename="{1}"rnContent-Type: application/octet-streamrnrn", parameter.FileNameKey, parameter.FileNameValue);
                byte[] fileHeaderBytes = parameter.Encoding.GetBytes(fileHeaderTemplate);
                memoryStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length);

                // 5.组装结束分界线数据体 到内存流中
                //memoryStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
                // 6.获取二进制数据
                postBytes = memoryStream.ToArray();
            }
            // 7.HttpWebRequest 组装
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(parameter.Url, UriKind.RelativeOrAbsolute));
            //对发送的数据不使用缓存【重要、关键】
            webRequest.AllowWriteStreamBuffering = false;
            webRequest.Method = "POST";
            webRequest.Timeout = 1800000;
            webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
            webRequest.ContentLength = postBytes.Length + parameter.UploadStream.Length + endBoundaryBytes.Length;
            webRequest.Headers.Add("X-Access-Token", "HSY715896176423170048");
            if (Regex.IsMatch(parameter.Url, "^https://"))
            {
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
                ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult;
            }
            // 8.组装文件流
            byte[] buffer = new byte[1024 * 1024 * 1];
            int size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
            Stream requestStream = webRequest.GetRequestStream();
            requestStream.Write(postBytes, 0, postBytes.Length);
            while (size > 0)
            {
                requestStream.Write(buffer, 0, size);
                size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
            }
            requestStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            requestStream.Close();
            // 9.获取响应
            using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
            {
                using (StreamReader reader = new StreamReader(webResponse.GetResponseStream(), parameter.Encoding))
                {
                    string body = reader.ReadToEnd();
                    reader.Close();
                    return body;
                }
            }
        }

上面的代码片段里面有针对请求https接口进行了证书处理顾增加一下代码：

 static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true;
        }

客户端调用上传：

  public static void UploadFiles()
        {
            try
            {
                using (FileStream fs = new FileStream(@"C:UserswhDesktop各类型发票电子发票.jpg", FileMode.Open, FileAccess.Read))
                {
                    Dictionary postParameter = new Dictionary();
                    postParameter.Add("name", "heshang");
                    postParameter.Add("param", "1 2 3");
                    string result = Execute(new UploadParameterType
                    {
                        Url = "上传文件的服务端地址",
                        UploadStream = fs,
                        FileNameValue = "电子发票.jpg",
                        PostParameters = postParameter
                    });
                }
            }
            catch (Exception)
            {

                throw;
            }
        }

最后上图postman：

最后还有个老哥的链接参考：
c#上传文件参考链接

最后加油！西红柿。