server/aspnetapp/Controllers/WebApi/WXFilesController.cs

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using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using RestSharp;
using System.Collections.Specialized;
using System.Net;
using System.Text;
using System.Text.Json;
using System.Web;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace aspnetapp.Controllers.WebApi
{
    [Route("api/[controller]")]
    [ApiController]
    public class WXFilesController : ControllerBase
    {

        //组装请求参数
        private string BuildQuery(IDictionary<string, string> parameters, string encode)
        {
            StringBuilder postData = new StringBuilder();
            bool hasParam = false;
            IEnumerator<KeyValuePair<string, string>> dem = parameters.GetEnumerator();
            while (dem.MoveNext())
            {
                string name = dem.Current.Key;
                string value = dem.Current.Value;
                // 忽略参数名或参数值为空的参数
                if (!string.IsNullOrEmpty(name))
                {
                    if (hasParam)
                    {
                        postData.Append("&");
                    }
                    postData.Append(name);
                    postData.Append("=");
                    if (encode == "gb2312")
                    {
                        postData.Append(HttpUtility.UrlEncode(value, Encoding.GetEncoding("gb2312")));
                    }
                    else if (encode == "utf8")
                    {
                        postData.Append(HttpUtility.UrlEncode(value, Encoding.UTF8));
                    }
                    else
                    {
                        postData.Append(value);
                    }
                    hasParam = true;
                }
            }
            return postData.ToString();
        }
        public class AccessToken
        {
            public string access_token { get; set; }
            public long expires_in { get; set; }
            public string refresh_token { get; set; }
            public string openid { get; set; }