.NET微信公众号开发-6.0模板消息

一.前言

    为了保证用户不受到骚扰，在开发者出现需要主动提醒、通知用户时，才允许开发者在公众平台网站中模板消息库中选择模板，选择后获得模板ID，再根据模板 ID向用户主动推送提醒、通知消息。这个意思也就是，我们作为微信商户，不能主动的给用户推送消息，如果这个功能完全开放，那么用户有可能会受到大量的垃 圾信息，为了做一个很好的控制，微信那边给我们开放了一个模板消息，通过模板消息我们可以友好的给用户发送一些相关的消息提醒。

二.开发前的准备

 1.0模板消息官方文档地址

 2.0查看我们的模板消息是否申请成功。申请成功后你可以看到如下图片：

三.开始编码

 一般我们在客户支付成功订单以后，会有一个支付的跳转页面，在我们前面的代码中也有相应的页面，代码如下：

<script type="text/javascript">

               //调用微信JS api 支付
               function jsApiCall()
               {
                   WeixinJSBridge.invoke(
                   'getBrandWCPayRequest',
                   <%=wxJsApiParam%>,//josn串
                    function (res)
                    {
                      if (res.err_msg == "get_brand_wcpay_request:ok")
                       {
                           var OrderId=$("#OrderId").val();
                           var orderProductName=$("#orderProductName").val();
                           var orderMoneySum=$("#orderMoneySum").val();

                            window.location.href="http://www.baidu.com/PaySkip.aspx?OrderId="+OrderId+"&orderMoneySum="+orderMoneySum+"&orderProductName="+orderProductName;//支付成功后的跳转页面

                        }else
                        {
                          WeixinJSBridge.call('closeWindow');
                        }
                         
                     }
                    );
               }

               function callpay()
               {
                   if (typeof WeixinJSBridge == "undefined")
                   {
                       if (document.addEventListener)
                       {
                           document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
                       }
                       else if (document.attachEvent)
                       {
                           document.attachEvent('WeixinJSBridgeReady', jsApiCall);
                           document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
                       }
                   }
                   else
                   {
                       jsApiCall();
                   }
               }
               
           </script>

    在上一篇，微信支付成功后，我们有这样一个支付跳转页面，在这个支付跳转页面里，我们可以写一些我们自己的业务逻辑，比如我们今天的主角，模板消息提醒：直接上代码

 protected void Page_Load(object sender, EventArgs e)
    {
        //Session["openid"] = "o3XP9joyPbSxbtP30jFWRZZ3x5TU";
        string appid = "wx45d851b036cefeb1";
        string secret = "bb0fed9b39313fd1bea3c8d425a06c6f";
        if (!IsPostBack)
        {
            string openid = Session["openid"] as string;
            string accessToken = Session["access_token"] as string;
            string url = Uri.EscapeDataString("http://m.gwbnsh.net.cn/temp/Default.aspx");//你的页面地址
            var data = new
            {
                first = new
                {
                    value = "尊敬的客户，您的宽带已申请成功",
                    color = "#173177"
                },
                keyword1 = new
                {
                    value = "李伟峰",
                    color = "#173177"
                },
                keyword2 = new
                {
                    value = "18102301717",
                    color = "#173177"
                },
                keyword3 = new
                {
                    value = "宽带新装申请",
                    color = "#173177"
                },
                remark = new
                {
                    value = "安装人员即将上门为您安装！请注意妥善保管宽带上网账号。",
                    color = "#173177"
                },

            };
            //string appid = "wx45d851b036cefeb1";
            //string secret = "bb0fed9b39313fd1bea3c8d425a06c6f";
            //string url = Uri.EscapeDataString("http://m.gwbnsh.net.cn/newapply/Apply_S3.aspx");//你的页面地址
            //string openid = System.Web.HttpContext.Current.Session["openid"] != null ? System.Web.HttpContext.Current.Session["openid"].ToString() : "";
            if (string.IsNullOrEmpty(openid))
            {
                string code = Request.Params["code"] as string;
                if (string.IsNullOrEmpty(code))
                {
                    Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx45d851b036cefeb1&redirect_uri=" + url + "&response_type=code&scope=snsapi_base&state=Gwbnsh#wechat_redirect");
                    Response.End();
                }
                else
                {
                    var newUrl = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, secret, code);
                    var client = new System.Net.WebClient();
                    client.Encoding = System.Text.Encoding.UTF8;
                    var dataUser = client.DownloadString(newUrl);
                    var serializer = new JavaScriptSerializer();
                    var obj = serializer.Deserialize<Dictionary<string, string>>(dataUser);
                    openid = obj["openid"];
                }
            }
            Session["openid"] = openid;//微信OpenID
            string templateId = "hN2SK3Ca0aLwIR5o6okdvLMYgeOZpxGiYtWi5JJiwhM";
            if (!string.IsNullOrEmpty(openid))
            {
                SendTemplate(openid, "_S8B_hJXRYY3sy9_6a2tHeISTc0SyWgcAl9NPGwhW3_2yqKKf6uPYSkbSD7fOKY3lHV2zF35NyuyQRVGBrKPkuHcoEx_jOYs3m5_KDtGcIN1vk6OPINv5vfQ1dgSPSP4MRJcCFAINF", templateId, data, "");
            }
        }
    }
    /// <summary>
    /// 给指定的用户发送模板消息
    /// </summary>
    /// <param name="openId">用户标识openid</param>
    /// <param name="templateId">对应的模板id</param>
    /// <param name="data">对应模板的参数</param>
    /// <param name="url">点击对应消息弹出的地址</param>
    /// <returns>返回json数据包</returns>
    public string SendTemplate(string openId, string token, string templateId, object data, string url)
    {
        JavaScriptSerializer Jss = new JavaScriptSerializer();
        var msgData = new
        {
            touser = openId,
            template_id = templateId,
            url = url,
            data = data
        };
        string postData = Jss.Serialize(msgData);
        return Post("https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=" + token, postData);
    }
    //Post数据到指定Url，并返回String类型
    public string Post(string Url, string Data)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(Url);
        byte[] requestBytes = System.Text.Encoding.UTF8.GetBytes(Data);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.ContentLength = requestBytes.Length;
        Stream requestStream = req.GetRequestStream();
        requestStream.Write(requestBytes, 0, requestBytes.Length);
        requestStream.Close();

        HttpWebResponse res = (HttpWebResponse)req.GetResponse();
        System.IO.StreamReader sr = new System.IO.StreamReader(res.GetResponseStream(), System.Text.Encoding.UTF8);
        string PostJie = sr.ReadToEnd();
        sr.Close();
        res.Close();
        return PostJie;
    }

从上面的代码中我们可以看到TemplateMessage.Send()这个方法是我们发送消息的关键，我们来看看这个方法是怎样的:

        #region 发送模板消息
        /// <summary>
        /// 发送模板消息
        /// </summary>
        /// <param name="userName">公众号</param>
        /// <param name="touser">接收消息的账号</param>
        /// <param name="templateId">模板id</param>
        /// <param name="detailUrl">详情地址</param>
        /// <param name="topColor">顶端颜色</param>
        /// <param name="data">数据</param>
        /// <param name="errorMessage">返回发送是否成功</param>
        /// <returns>返回消息id；如果发送失败，返回-1。</returns>
        public static long Send(string userName, string touser, string templateId, string detailUrl, Color topColor,
            Tuple<string, string, Color>[] data, out ErrorMessage errorMessage)
        {
            errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "");
            long id = -1;
            //校验参数
            if (string.IsNullOrWhiteSpace(touser))
            {
                errorMessage.errmsg = "接收消息的账号不能为空。";
                return id;
            }
            if (string.IsNullOrWhiteSpace(templateId))
            {
                errorMessage.errmsg = "模板id不能为空。";
                return id;
            }
            if (data == null || data.Length == 0)
            {
                errorMessage.errmsg = "模板数据不能为空。";
                return id;
            }
            foreach (Tuple<string, string, Color> item in data)
            {
                if (string.IsNullOrWhiteSpace(item.Item1) || string.IsNullOrWhiteSpace(item.Item2))
                {
                    errorMessage.errmsg = "模板数据不能为空。";
                    return id;
                }
            }
            //获取许可令牌
            AccessToken token = AccessToken.Get(userName);
            if (token == null)
            {
                errorMessage.errmsg = "获取许可令牌失败。";
                return id;
            }
            string url = string.Format(urlForSending, token.access_token);
            //生成待发送的数据
            dynamic postData = new ExpandoObject();
            postData.touser = touser;
            postData.template_id = templateId;
            postData.url = detailUrl ?? string.Empty;
            postData.topcolor = Utility.GetColorString(topColor);
            postData.data = new ExpandoObject();
            IDictionary<string, object> dataDict = (IDictionary<string, object>)postData.data;
            foreach (Tuple<string, string, Color> item in data)
            {
                dataDict.Add(item.Item1, new { value = item.Item2, color = Utility.GetColorString(item.Item3) });
            }
            string json = JsonConvert.SerializeObject(postData);
            //发送数据
            string responseContent;
            if (!HttpHelper.Request(url, out responseContent, httpMethod, json))
            {
                errorMessage.errmsg = "提交数据到微信服务器失败。";
                return id;
            }
            //解析结果
            JObject jo = JObject.Parse(responseContent);
            JToken jt;
            if (jo.TryGetValue("errcode", out jt) && jo.TryGetValue("errmsg", out jt))
            {
                errorMessage.errcode = (int)jo["errcode"];
                errorMessage.errmsg = (string)jo["errmsg"];
                if (jo.TryGetValue("msgid", out jt))
                    id = (long)jt;
            }
            else
                errorMessage.errmsg = "解析返回结果失败。";
            return id;
        } 
        #endregion

 AccessToken token = AccessToken.Get(userName);获取许可令牌上一篇文章中我们已经说过这个类，这里就不多说了，HttpHelper帮助类的代码如下:

   /// <summary>
    /// HttpHelper：http请求与响应辅助类
    /// </summary>
    public static class HttpHelper
    {
        /// <summary>
        /// 向微信服务器发送请求时的编码
        /// </summary>
        public static readonly Encoding RequestEncoding = Encoding.UTF8;
        /// <summary>
        /// 微信服务器响应的编码
        /// </summary>
        public static readonly Encoding ResponseEncoding = Encoding.UTF8;

        /// <summary>
        /// 向微信服务器提交数据，并获取微信服务器响应的数据
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// <param name="responseData">返回响应数据</param>
        /// /// <param name="httpMethod">http方法</param>
        /// <param name="data">数据</param>
        /// <returns>返回是否提交成功</returns>
        public static bool Request(string url, out byte[] responseData,
            string httpMethod = WebRequestMethods.Http.Get, byte[] data = null)
        {
            bool success = false;
            responseData = null;
            Stream requestStream = null;
            HttpWebResponse response = null;
            Stream responseStream = null;
            MemoryStream ms = null;
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = httpMethod;
                if (data != null && data.Length > 0)
                {
                    request.ContentLength = data.Length;
                    requestStream = request.GetRequestStream();
                    requestStream.Write(data, 0, data.Length);
                }
                response = (HttpWebResponse)request.GetResponse();
                //由于微信服务器的响应有时没有正确设置ContentLength，这里不检查ContentLength
                //if (response.ContentLength > 0)
                {
                    ms = new MemoryStream();
                    responseStream = response.GetResponseStream();
                    int bufferLength = 2048;
                    byte[] buffer = new byte[bufferLength];
                    int size = responseStream.Read(buffer, 0, bufferLength);
                    while (size > 0)
                    {
                        ms.Write(buffer, 0, size);
                        size = responseStream.Read(buffer, 0, bufferLength);
                    }
                    responseData = ms.ToArray();
                }
                success = true;
            }
            finally
            {
                if (requestStream != null)
                    requestStream.Close();
                if (responseStream != null)
                    responseStream.Close();
                if (ms != null)
                    ms.Close();
                if (response != null)
                    response.Close();
            }
            return success;
        }

        /// <summary>
        /// 向微信服务器提交数据，并获取微信服务器响应的数据
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// <param name="responseData">返回响应数据</param>
        /// /// <param name="httpMethod">http方法</param>
        /// <param name="data">数据</param>
        /// <returns>返回是否提交成功</returns>
        public static bool Request(string url, out byte[] responseData,
            string httpMethod = WebRequestMethods.Http.Get, string data = null)
        {
            byte[] bytes = string.IsNullOrEmpty(data) ? null : RequestEncoding.GetBytes(data);
            return Request(url, out responseData, httpMethod, (byte[])bytes);
        }

        /// <summary>
        /// 向微信服务器提交数据，并获取微信服务器响应的内容
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// <param name="responseContent">返回响应内容</param>
        /// /// <param name="httpMethod">http方法</param>
        /// <param name="data">数据</param>
        /// <returns>返回是否提交成功</returns>
        public static bool Request(string url, out string responseContent,
            string httpMethod = WebRequestMethods.Http.Get, byte[] data = null)
        {
            byte[] responseData;
            responseContent = string.Empty;
            bool success = Request(url, out responseData, httpMethod, data);
            if (success && responseData != null && responseData.Length > 0)
                responseContent = ResponseEncoding.GetString(responseData);
            return success;
        }

        /// <summary>
        /// 向微信服务器提交数据，并获取微信服务器响应的内容
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// <param name="responseContent">返回响应内容</param>
        /// /// <param name="httpMethod">http方法</param>
        /// <param name="data">数据</param>
        /// <returns>返回是否提交成功</returns>
        public static bool Request(string url, out string responseContent,
            string httpMethod = WebRequestMethods.Http.Get, string data = null)
        {
            byte[] bytes = string.IsNullOrEmpty(data) ? null : RequestEncoding.GetBytes(data);
            return Request(url, out responseContent, httpMethod, (byte[])bytes);
        }

        /// <summary>
        /// 向微信服务器提交数据
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// /// <param name="httpMethod">http方法</param>
        /// <param name="data">数据</param>
        /// <returns>返回是否提交成功</returns>
        public static bool Request(string url, string httpMethod = WebRequestMethods.Http.Get, byte[] data = null)
        {
            bool success = false;
            Stream requestStream = null;
            HttpWebResponse response = null;
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = httpMethod;
                if (data != null && data.Length > 0)
                {
                    request.ContentLength = data.Length;
                    requestStream = request.GetRequestStream();
                    requestStream.Write(data, 0, data.Length);
                }
                response = (HttpWebResponse)request.GetResponse();
                success = true;
            }
            finally
            {
                if (requestStream != null)
                    requestStream.Close();
                if (response != null)
                    response.Close();
            }
            return success;
        }

        /// <summary>
        /// 组合url，发送数据，然后返回响应字符串
        /// </summary>
        /// <param name="urlFormat">url格式字符串，第一个参数为userName获取到的许可令牌，然后依次为parameters中的参数</param>
        /// <param name="userName">公众号</param>
        /// <param name="urlParameters">参数</param>
        /// <param name="httpMethod">执行请求的http方法</param>
        /// <param name="data">请求的内容</param>
        /// <returns>返回响应内容；如果请求失败，或者发生错误，返回空字符串</returns>
        public static string RequestResponseContent(string urlFormat, string userName, IEnumerable<object> urlParameters = null, string httpMethod = WebRequestMethods.Http.Get, string data = null)
        {
            string responseContent = string.Empty;
            AccessToken token = AccessToken.Get(userName);
            if (token == null)
                return responseContent;
            string url;
            if (urlParameters == null)
                url = string.Format(urlFormat, token.access_token);
            else
            {
                List<object> paramList = new List<object>(urlParameters);
                paramList.Insert(0, token.access_token);
                url = string.Format(urlFormat, paramList.ToArray());
            }
            HttpHelper.Request(url, out responseContent, httpMethod, (string)data);
            return responseContent;
        }

        /// <summary>
        /// 组合url，发送数据，然后返回响应的错误消息。
        /// 注：错误消息不一定代表失败或者错误。
        /// </summary>
        /// <param name="urlFormat">url格式字符串，第一个参数为userName获取到的许可令牌，然后依次为parameters中的参数</param>
        /// <param name="userName">公众号</param>
        /// <param name="urlParameters">参数</param>
        /// <param name="httpMethod">执行请求的http方法</param>
        /// <param name="data">请求的内容</param>
        /// <returns>返回响应的错误消息</returns>
        public static ErrorMessage RequestErrorMessage(string urlFormat, string userName, IEnumerable<object> urlParameters = null, string httpMethod = WebRequestMethods.Http.Get, string data = null)
        {
            string responseContent = RequestResponseContent(urlFormat, userName, urlParameters, httpMethod, data);
            if (string.IsNullOrWhiteSpace(responseContent))
                return new ErrorMessage(ErrorMessage.ExceptionCode, "请求失败。");
            else if (ErrorMessage.IsErrorMessage(responseContent))
                return ErrorMessage.Parse(responseContent);
            else
                return new ErrorMessage(ErrorMessage.ExceptionCode, "解析响应失败。");
        }

        /// <summary>
        /// 组合url，发送数据，然后返回结果。
        /// 注：结果为需要解析的类。
        /// </summary>
        /// <typeparam name="T">返回结果的类型</typeparam>
        /// <param name="urlFormat">url格式字符串，第一个参数为userName获取到的许可令牌，然后依次为parameters中的参数</param>
        /// <param name="userName">公众号</param>
        /// <param name="errorMessage">返回请求是否成功</param>
        /// <param name="urlParameters">参数</param>
        /// <param name="httpMethod">执行请求的http方法</param>
        /// <param name="data">请求的内容</param>
        /// <returns>返回结果；如果请求失败，或者发生错误，返回null。</returns>
        public static T RequestParsableResult<T>(string urlFormat, string userName, out ErrorMessage errorMessage, IEnumerable<object> urlParameters = null, string httpMethod = WebRequestMethods.Http.Get, string data = null)
            where T : IParsable, new()
        {
            T result = default(T);
            errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "请求失败。");
            string responseContent = RequestResponseContent(urlFormat, userName, urlParameters, httpMethod, data);
            if (string.IsNullOrWhiteSpace(responseContent))
                return result;
            if (ErrorMessage.IsErrorMessage(responseContent))
                errorMessage = ErrorMessage.Parse(responseContent);
            else
            {
                try
                {
                    result = Utility.Parse<T>(responseContent);
                    if (result != null)
                        errorMessage = new ErrorMessage(ErrorMessage.SuccessCode, "请求成功。");
                    else
                        errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "解析失败。");
                }
                catch
                {
                    errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "解析失败。");
                }
            }
            return result;
        }

        /// <summary>
        /// 组合url，发送数据，然后返回结果。
        /// 注：结果为已知的简单值类型。
        /// </summary>
        /// <typeparam name="T">返回结果的类型</typeparam>
        /// <param name="urlFormat">url格式字符串，第一个参数为userName获取到的许可令牌，然后依次为parameters中的参数</param>
        /// <param name="userName">公众号</param>
        /// <param name="propertyNameInJson">返回结果在json中的键名</param>
        /// <param name="errorMessage">返回请求是否成功</param>
        /// <param name="urlParameters">参数</param>
        /// <param name="httpMethod">执行请求的http方法</param>
        /// <param name="data">请求的内容</param>
        /// <returns>返回结果；如果请求失败，或者发生错误，返回default(T)。</returns>
        public static T RequestValueTypeResult<T>(string urlFormat, string userName, string propertyNameInJson, out ErrorMessage errorMessage, IEnumerable<object> urlParameters = null, string httpMethod = WebRequestMethods.Http.Get, string data = null)
            where T : struct
        {
            errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "请求失败。");
            string responseContent = RequestResponseContent(urlFormat, userName, urlParameters, httpMethod, data);
            return ConvertValueTypeResult<T>(responseContent, propertyNameInJson, out errorMessage);
        }

        /// <summary>
        /// 获取值类型的结果
        /// </summary>
        /// <typeparam name="T">返回结果的类型</typeparam>
        /// <param name="responseContent">响应内容</param>
        /// <param name="propertyNameInJson">返回结果在json中的键名</param>
        /// <param name="errorMessage">返回请求是否成功</param>
        /// <returns>返回结果；如果请求失败，或者发生错误，返回default(T)。</returns>
        private static T ConvertValueTypeResult<T>(string responseContent, string propertyNameInJson, out ErrorMessage errorMessage)
            where T : struct
        {
            if (string.IsNullOrWhiteSpace(responseContent))
            {
                errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "请求失败。");
                return default(T);
            }
            if (ErrorMessage.IsErrorMessage(responseContent))
                errorMessage = ErrorMessage.Parse(responseContent);
            else
                errorMessage = new ErrorMessage(ErrorMessage.SuccessCode, "请求成功。");
            JObject jo = JObject.Parse(responseContent);
            JToken jt;
            if (jo.TryGetValue(propertyNameInJson, out jt))
                return ConvertValueTypeResult<T>((string)jt);
            else
                return default(T);
        }

        /// <summary>
        /// 获取值类型的结果
        /// </summary>
        /// <typeparam name="T">返回结果的类型</typeparam>
        /// <param name="responseContent">响应内容</param>
        /// <param name="propertyNameInJson">返回结果在json中的键名</param>
        /// <param name="errorMessage">返回请求是否成功</param>
        /// <returns>返回结果；如果请求失败，或者发生错误，返回default(T)。</returns>
        private static T ConvertValueTypeResult<T>(string value)
            where T : struct
        {
            Type type = typeof(T);
            if (type.IsEnum)
                return (T)Enum.Parse(type, value);
            else if (type == typeof(sbyte))
                return (T)(object)Convert.ToSByte(value);
            else if (type == typeof(byte))
                return (T)(object)Convert.ToByte(value);
            else if (type == typeof(char))
                return (T)(object)Convert.ToChar(value);
            else if (type == typeof(short))
                return (T)(object)Convert.ToInt16(value);
            else if (type == typeof(ushort))
                return (T)(object)Convert.ToUInt16(value);
            else if (type == typeof(int))
                return (T)(object)Convert.ToInt32(value);
            else if (type == typeof(uint))
                return (T)(object)Convert.ToUInt32(value);
            else if (type == typeof(long))
                return (T)(object)Convert.ToInt64(value);
            else if (type == typeof(ulong))
                return (T)(object)Convert.ToUInt64(value);
            else if (type == typeof(float))
                return (T)(object)Convert.ToSingle(value);
            else if (type == typeof(double))
                return (T)(object)Convert.ToDouble(value);
            else if (type == typeof(decimal))
                return (T)(object)Convert.ToDecimal(value);
            else if (type == typeof(bool))
                return (T)(object)Convert.ToBoolean(value);
            else
                throw new ArgumentException("不支持的值类型。");
        }

        /// <summary>
        /// 向微信服务器提交数据
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// /// <param name="httpMethod">http方法</param>
        /// <param name="data">数据</param>
        /// <returns>返回是否提交成功</returns>
        public static bool Request(string url, string httpMethod = WebRequestMethods.Http.Get, string data = null)
        {
            byte[] bytes = string.IsNullOrEmpty(data) ? null : RequestEncoding.GetBytes(data);
            return Request(url, httpMethod, (byte[])bytes);
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// <param name="filename">文件名（不包含路径）</param>
        /// <param name="fileData">文件数据</param>
        /// <param name="formData">表单数据</param>
        /// <returns>返回服务器的响应字符串</returns>
        public static string Upload(string url, string filename, byte[] fileData, NameValueCollection formData = null)
        {
            string responseContent = string.Empty;
            if (string.IsNullOrWhiteSpace(url) || string.IsNullOrWhiteSpace(filename) || fileData == null || fileData.Length == 0)
                return responseContent;
            // 边界符
            string boundary = "AaB03xAaB03x";
            // 开始边界符
            byte[] beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "
");
            // 结束符
            byte[] endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--
");
            //换行
            byte[] newLine = Encoding.ASCII.GetBytes("
");
            MemoryStream ms = null;
            Stream stream = null;
            HttpWebResponse response = null;
            StreamReader sr = null;
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = WebRequestMethods.Http.Post;
                request.ContentType = "multipart/form-data; boundary=" + boundary;
                // 写入文件
                string header = string.Format("Content-Disposition: form-data; filename="{0}"
" +
                     "Content-Type: application/octet-stream

",
                     filename);
                byte[] headerbytes = Encoding.UTF8.GetBytes(header);
                ms = new MemoryStream();
                ms.Write(beginBoundary, 0, beginBoundary.Length);
                ms.Write(headerbytes, 0, headerbytes.Length);
                ms.Write(fileData, 0, fileData.Length);
                // 写入表单数据
                if (formData != null && formData.Count > 0)
                {
                    var formItem = "
--" + boundary +
                                           "
Content-Disposition: form-data; name="{0}"" +
                                           "

{1}
";
                    foreach (string key in formData.Keys)
                    {
                        string value = formData[key];
                        byte[] bytes = Encoding.UTF8.GetBytes(string.Format(formItem, key, value));
                        ms.Write(bytes, 0, bytes.Length);
                    }
                }
                //写入结束边界符
                ms.Write(newLine, 0, newLine.Length);
                ms.Write(endBoundary, 0, endBoundary.Length);
                request.ContentLength = ms.Length;
                stream = request.GetRequestStream();
                stream.Write(ms.ToArray(), 0, (int)ms.Length);
                //获取响应
                response = (HttpWebResponse)request.GetResponse();
                sr = new StreamReader(response.GetResponseStream(), HttpHelper.ResponseEncoding);
                responseContent = sr.ReadToEnd();
            }
            finally
            {
                if (ms != null)
                    ms.Close();
                if (stream != null)
                    stream.Close();
                if (sr != null)
                    sr.Close();
                if (response != null)
                    response.Close();
            }
            return responseContent;
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="url">服务器地址</param>
        /// <param name="pathname">包含路径的文件名</param>
        /// <param name="formData">表单数据</param>
        /// <returns>返回服务器的响应字符串</returns>
        public static string Upload(string url, string pathname, NameValueCollection formData = null)
        {
            string filename = Path.GetFileName(pathname);
            byte[] data = null;
            FileStream fs = null;
            MemoryStream ms = null;
            try
            {
                fs = new FileStream(pathname, FileMode.Open, FileAccess.Read);
                ms = new MemoryStream();
                int bufferLength = 2048;
                byte[] buffer = new byte[bufferLength];
                int size = fs.Read(buffer, 0, bufferLength);
                while (size > 0)
                {
                    ms.Write(buffer, 0, size);
                    size = fs.Read(buffer, 0, bufferLength);
                }
                data = ms.ToArray();
            }
            finally
            {
                if (fs != null)
                    fs.Close();
                if (ms != null)
                    ms.Close();
            }
            return Upload(url, filename, data, formData);
        }
    }

复制代码

四.最终效果如下: