/// <summary>
/// 扫码支付模式一生成二维码
/// </summary>
/// <param name="id">订单号</param>
public void NativePayOne(string id)
{
SortedDictionary <string, object> orderParams = new SortedDictionary <string, object>();
orderParams.Add("appid", ApiModel.AppID); //公众帐号id
orderParams.Add("mch_id", ApiModel.MchID); //商户号
orderParams.Add("time_stamp", Common.GetTimeStamp()); //时间戳
orderParams.Add("nonce_str", Common.GetNonceStr()); //随机字符串
orderParams.Add("product_id", id); //商品订单号
orderParams.Add("sign", Pay.GetSign(orderParams, ApiModel.MchAPISecret)); //签名
//预支付URL
var url = Pay.GetPayUrlForNativeOne(orderParams);
//初始化二维码生成工具
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
qrCodeEncoder.QRCodeVersion = 0;
qrCodeEncoder.QRCodeScale = 4;
//将字符串生成二维码图片
Bitmap image = qrCodeEncoder.Encode(url, Encoding.Default);
//保存为PNG到内存流
MemoryStream ms = new MemoryStream();
image.Save(ms, ImageFormat.Png);
//输出二维码图片
Response.BinaryWrite(ms.GetBuffer());
Response.End();
}