接收参数string 生成二维码图片

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using System; 
using System.Configuration;
using System.Drawing; 
using System.Net;
using System.Text;
using System.Web; 
using TechManager.Framework.Web.UI;
using ThoughtWorks.QRCode.Codec;
 protected void Page_Load(object sender, EventArgs e)
{
    var uid = Context.User.Identity.Name;
    var pid = ConfigurationManager.AppSettings["WeChatPId"];
    var url = $"https://wx.bim999.net/weixin/getoauthurl?pid={ pid }&uid={ uid }";
    var request = (HttpWebRequest)WebRequest.Create(url);
    //获取接受到网址的内容
    using (var response = (HttpWebResponse)request.GetResponse())
    {
        using (var sr = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8))
        {
            //获取二维码地址
            // QRImg.ImageUrl = sr.ReadToEnd();
            //获取值生成二维码
            CreateQR(HttpUtility.UrlDecode(sr.ReadToEnd()));
        }
    }
}
private void CreateQR(string nr)
{
    Bitmap bt;
    if (!string.IsNullOrEmpty(nr))
    {
        string filename = Guid.NewGuid().ToString().ToUpper();
        QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
        qrCodeEncoder.QRCodeVersion = 0;
        bt = qrCodeEncoder.Encode(nr, Encoding.UTF8);
        string imgPath = Server.MapPath("~/ImageQR/") + filename + ".jpg";
        try
        {
            bt.Save(imgPath);
            QRImg.ImageUrl = "~/ImageQR/" + filename + ".jpg";
        }
        catch (Exception)
        {
        }
    }
}