/// <summary>
/// 拼接 Get请求参数
/// </summary>
/// <param name="parames"></param>
/// <returns></returns>
private static Tuple<string, string> GetQueryString(Dictionary<string, string> parames)
{
    StringBuilder query = new StringBuilder("");
    StringBuilder queryStr = new StringBuilder("");
    if (parames == null || parames.Count == 0)
        return new Tuple<string, string>("", "");

    foreach (var item in parames)
    {
        string key = item.Key;
        string value = item.Value;
        if (!string.IsNullOrEmpty(key))
        {
            query.Append(key).Append(value);
            queryStr.Append("&").Append(key).Append("=").Append(value);
        }
    }

    return new Tuple<string, string>(query.ToString(), queryStr.ToString().Substring(1, queryStr.Length - 1));
}

/// <summary>
/// 请求连接 函数封装
/// </summary>
/// <param name="requestType">请求方式：Get、Post等</param>
/// <param name="requestLink">连接地址</param>
/// <param name="query">请求参数</param>
/// <returns></returns>
public static string GetWeChatToken(string requestType,string requestLink, string query)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestLink + "?" + query);
    request.Method = requestType;
    request.ContentType = "application/json";
    request.Timeout = 90000;
    request.Headers.Set("Pragma", "no-cache");
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    Stream streamReceive = response.GetResponseStream();
    StreamReader streamReader = new StreamReader(streamReceive, Encoding.UTF8);
    result = streamReader.ReadToEnd();

    streamReader.Close();
    streamReceive.Close();
    request.Abort();
    response.Close();

    return result;
}