C#生成二维码

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namespace Common.QRCode {     using System.Drawing;     using QRCoder;       /// <summary>     /// 二维码帮助类     /// </summary>     public class QRCodeHelper     {         /// <summary>         /// 普通二维码         /// </summary>         /// <param name="url">存储内容</param>         /// <param name="pixel">像素大小</param>         /// <returns>图片</returns>         public static Bitmap GetPTQRCode(string url, int pixel = 5)         {             QRCodeGenerator generator = new QRCodeGenerator();             QRCodeData codeData = generator.CreateQrCode(url, QRCodeGenerator.ECCLevel.M, true);             QRCoder.QRCode qrcode = new QRCoder.QRCode(codeData);             Bitmap image = qrcode.GetGraphic(pixel, Color.Black, Color.White, true);             return image;         }     } }