1、上传永久图片素材，注意构造请求头部信息时name="media"就行了
视图代码：
@using (Html.BeginForm("UploadFile", "MenuConfig", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<span>上传文件</span>
<input type="file" name="file" id="f" />
<input id="ButtonUpload" type="submit" value="提交" />
}
Action代码：
/// <summary>
/// 上传图片素材调用微信接口
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public JsonResult UploadPhoto(HttpPostedFileBase file)
{
var buf = new byte[file.InputStream.Length];
file.InputStream.Read(buf, 0, (int)file.InputStream.Length);
string resultUpload = WeixinConfigBusiness.HttpUploadFile(file.FileName, buf);
var jsonObj = JsonConvert.DeserializeObject<JObject>(resultUpload);//获取上传后返回的结果状态
if (jsonObj["media_id"] != null && jsonObj["media_id"].ToString() != "")//如果上传成功.....
{
return Json(new { result = true });
}
return Json(new { result = false });
}
/// <summary>
/// 上传永久图片素材并获取media_id和图片URL
/// </summary>
public static string HttpUploadFile(string path, byte[] bf)
{
var accessToken = new WeixinConfigBusiness().GetAccessToken();
string url = string.Format("https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={0}&type={1}", accessToken, "image");
return HttpUploadPhoto(url, path, bf);
}
/// <summary>
///
/// </summary>
/// <param name="url"></param>
/// <param name="path"></param>
/// <param name="bf"></param>
/// <returns></returns>
public static string HttpUploadPhoto(string url, string path, byte[] bf)
{
var accessToken = new WeixinConfigBusiness().GetAccessToken();
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
CookieContainer cookieContainer = new CookieContainer();
request.CookieContainer = cookieContainer;
request.AllowAutoRedirect = true;
request.Method = "POST";
string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
int pos = path.LastIndexOf("\\");
string fileName = path.Substring(pos + 1);
//请求头部信息
StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"media\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());
Stream postStream = request.GetRequestStream();
postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
postStream.Write(bf, 0, bf.Length);
postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
postStream.Close();
//发送请求并获取相应回应数据
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
Stream instream = response.GetResponseStream();
StreamReader sr = new StreamReader(instream, Encoding.UTF8);
string content = sr.ReadToEnd();
return content;
}