QRCoder1.4.3生成二维码，不依赖System.Drawing，解决"未能找到类型或命名空间名QRCode"，"及ImageFormatPng仅在windows上受支持"

using QRCoder;

        /// <summary>
        ///生成二维码/// </summary>
        /// <param name="data">escape后的数据，防止中文等特殊字符引起问题</param>
        /// <param name="size">二维码宽高</param>
        /// <param name="level">0.L (7%), 1.M (15%), 2.Q (25%) 3.H (30%)</param>
        /// <param name="border">是否包含白边</param>
        /// <returns></returns>
[HttpGet]public IActionResult Generate(string text, int size = 400, int level = 1, bool border = false)

        {if (string.IsNullOrEmpty(text))return BadRequest("内容不能为空.");//设置最小和最大尺寸50-1920
            size = size < 50 ? 50 : size > 1920 ? 1920: size;



            QRCodeGenerator qrGenerator= new();

            QRCodeData qrCodeData=qrGenerator.CreateQrCode(text, (QRCodeGenerator.ECCLevel)level);int pixelsPerModule = size / 21; //size = pixelsPerModule * 21
            using PngByteQRCode qrCode = new(qrCodeData);byte[] qrCodeBytes =qrCode.GetGraphic(pixelsPerModule, drawQuietZones: border);//将字节数组转换为Base64字符串
            string base64Image =Convert.ToBase64String(qrCodeBytes);//返回Base64字符串作为图片的src属性值// return $"data:image/png;base64,{base64Image}";
            return File(qrCodeBytes, "image/png", "QrCode.png");

        }

usingQRCoder;usingSixLabors.ImageSharp;usingSixLabors.ImageSharp.Formats.Png;usingSixLabors.ImageSharp.PixelFormats;usingSixLabors.ImageSharp.Processing;usingWebApplication7.Models;using Color =SixLabors.ImageSharp.Color;using Image =SixLabors.ImageSharp.Image;using Point = SixLabors.ImageSharp.Point;

[HttpGet]

public IActionResult Generate2(string text, int size = 400, int level = 1, int borderWidth = 0)

 {if (string.IsNullOrEmpty(text))return BadRequest("内容不能为空.");//设置最小和最大尺寸50-1920
     size = size < 50 ? 50 : size > 1920 ? 1920: size;



     QRCodeGenerator qrGenerator= new();

     QRCodeData qrCodeData=qrGenerator.CreateQrCode(text, (QRCodeGenerator.ECCLevel)level);using PngByteQRCode qrCode = new(qrCodeData);byte[] qrCodeBytes = qrCode.GetGraphic(50, drawQuietZones: false);using MemoryStream stream = new(qrCodeBytes);using Image<Rgba32> qrCodeImage = Image.Load<Rgba32>(stream);//调整图像大小
     qrCodeImage.Mutate(ctx =>ctx.Resize(size, size));//添加空白来模拟白边
     borderWidth = borderWidth <= 0 ? 50 : borderWidth; //调整白边的宽度
     Image<Rgba32> borderedImage = new(qrCodeImage.Width + 2 * borderWidth, qrCodeImage.Height + 2 *borderWidth);

     borderedImage.Mutate(ctx=> ctx.BackgroundColor(Color.White).DrawImage(qrCodeImage, newPoint(borderWidth, borderWidth), 1f));//将调整大小后的图像保存为字节数组
     using MemoryStream resizedStream = new();

     borderedImage.Save(resizedStream,newPngEncoder());byte[] resizedBytes =resizedStream.ToArray();//将字节数组转换为Base64字符串
     string base64Image =Convert.ToBase64String(resizedBytes);//返回Base64字符串作为图片的src属性值 // return $"data:image/png;base64,{base64Image}";
     return File(resizedBytes, "image/png", "QrCode.png");

 }