C#生成二维码

/// <summary>
/// 根据单号生成二维码
/// </summary>
/// <param name="strData"></param>
/// <returns></returns>
public static string _getQR(string strData)
{
string str = "";
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeScale = 3;
qrCodeEncoder.QRCodeVersion = 3;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
System.Drawing.Image image = qrCodeEncoder.Encode(strData);
string filename = DateTime.Now.ToString("yyyymmddhhmmssfff").ToString() + ".jpg";
string filepath = HttpContext.Current.Server.MapPath(@"~Images") + "\" + filename;
System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
fs.Close();
image.Dispose();
str = @"/Images/" + filename;
return str;
}

//下载ThoughtWorks.QRCode.dll