微信素材上传

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;

namespace W.BLL.WeChat
{
public class PermanentMaterialUploads
{
/// <summary>
/// 永久其它类型素材上传
/// </summary>
/// <param name="accessToken">AccessToken</param>
/// <param name="isFile">素材</param>
/// <param name="materialType">上传的数据类型</param>
/// <param name="title">针对视频文件  文件名称</param>
/// <param name="introduction">针对视频文件  文件描述</param>
/// <returns></returns>
public static string MaterialUploads(string accessToken, HttpPostedFileBase isFile, string materialType, string title = "", string introduction = "")
{
string url = "https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={0}";
url = string.Format(url, accessToken);

//设置提交表单的名称
string formName = materialType == "video" ? "description" : "media";

byte[] datas = null;

#region 组合正文
//换行
string CRLF = "\r\n";

//边界标识
string Identification = "----" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");

try
{

//生成表单信息
StringBuilder sb = new StringBuilder();
sb.Append("--");
sb.Append(Identification);
sb.Append(CRLF);
sb.Append("Content-Disposition: form-data; id=\"" + formName + "\"; name=\"" + formName + "\"; filename=\"" + isFile.FileName + "\"");
sb.Append(CRLF);
sb.Append("Content-Type: " + isFile.ContentType.ToLower() + "");
sb.Append(CRLF);
sb.Append(CRLF);

//如果是视频数据，就添加视频标题与视频的描述信息
if (materialType == "video")
{
sb.Append("description=\"{\"title\":\"" + title + "\", \"introduction\":\"" + introduction + "\"}\"");
sb.Append(CRLF);
sb.Append(CRLF);
}

//头部与尾部
string header = sb.ToString();
string foot = CRLF + "--" + Identification + "--" + CRLF;

//转为byte[]流
byte[] headerbytes = Encoding.UTF8.GetBytes(header);
byte[] footbytes = Encoding.UTF8.GetBytes(foot);

List<byte> datalist = new List<byte>();

//转换为btye[]数据流
Stream stream = isFile.InputStream;
byte[] data = new byte[stream.Length];
stream.Read(data, 0, data.Length);

// 设置当前流的位置为流的开始
stream.Seek(0, SeekOrigin.Begin);

datalist.AddRange(headerbytes);
datalist.AddRange(data);
datalist.AddRange(footbytes);

//组合完整的流数据
datas = datalist.ToArray<byte>();
}
catch (Exception)
{
return "正文组合失败";
}
#endregion

return MaterialUpload(datas, url, Identification);
}

/// <summary>
/// 微信素材上传
/// </summary>
/// <param name="data"></param>
/// <param name="url"></param>
/// <param name="Identification">正文边界</param>
/// <returns></returns>
public static string MaterialUpload(byte[] data, string url, string Identification)
{
Stream responseStream;
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
if (request == null)
{
throw new ApplicationException(string.Format("Invalid url string: {0}", url));
}
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
request.ContentType = "multipart/form-data; boundary=" + Identification;
//request.ContentType = "application/x-www-form-urlencoded; boundary=" + Identification;
request.Method = "POST";
request.ContentLength = data.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(data, 0, data.Length);
requestStream.Close();
try
{
responseStream = request.GetResponse().GetResponseStream();
}
catch (Exception exception)
{
throw exception;
}
string str = string.Empty;
using (StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8")))
{
str = reader.ReadToEnd();
}
responseStream.Close();
return str;
}
}
}