生成二维码1(简单)
包引用:
<PackageReference Include="QRCoder" Version="1.4.3" />
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");
}
优点:生成的base64比较小
缺点:不能控制白边的宽度
size大小需要是21的倍数,否则生成的二维码宽度<=指定的size大小
生成二维码2(自定义白边的宽度)
引用包:
<PackageReference Include="SixLabors.ImageSharp" Version="3.1.2" />
using QRCoder;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats.Png;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using WebApplication7.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, new Point(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, new PngEncoder());
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");
}
优缺点与方法1相反