/// <summary>
/// 图片不占用公众号的素材库中图片数量的100000个的限制，
/// 图片仅支持jpg/png格式，大小必须在1MB以下。
/// </summary>
/// <param name="access_token">公众号access token</param>
/// <param name="filepath">素材物理路径</param>
/// <param name="timeout">超时时间，单位毫秒</param>
/// <returns></returns>
public MaterialResult UploadImg(string access_token, string filepath, int timeout = 1200000)
{
string url = $"{Config.WxApi}cgi-bin/media/uploadimg?access_token={access_token}";
Dictionary <string, string> dic = new Dictionary <string, string>();
dic.Add("media", filepath);
MaterialResult result = this.AddFileToWeChat <MaterialResult>(url, dic, timeout);
return(result);
}
/// <summary>
/// 新增其他类型永久素材
/// </summary>
/// <param name="access_token"></param>
/// <param name="type"> 媒体文件类型，分别有图片（image）、语音（voice）、视频（video）和缩略图（thumb）</param>
/// <param name="filepath">素材物理路径</param>
/// <param name="title">视频标题，上传视频素材时此字段才有意义</param>
/// <param name="introduction">视频简介，上传视频素材时此字段才有意义</param>
/// <param name="timeout">超时时间，单位毫秒</param>
/// <returns></returns>
public MaterialResult AddMaterial(string access_token, string type, string filepath, string title, string introduction = "INTRODUCTION", int timeout = 1200000)
{
string url = $"{Config.WxApi}cgi-bin/material/add_material?access_token={access_token}&type={type}";
var fileDictionary = new Dictionary <string, string>
{
["media"] = filepath,
["description"] = "{\"title\":\"" + title + "\", \"introduction\":\"" + introduction + "\"}"
};
MaterialResult result = this.AddFileToWeChat <MaterialResult>(url, fileDictionary, timeout);
return(result);
}