验证码优化建议

之前的private static byte[] GenerateImage(string code)在linux下面或docker容器下面有严重的兼容问题，更换成了SixLabors.ImageSharp。
代码如下：
using System;
using System.Text;
using System.IO;
using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp.Drawing;
using SixLabors.ImageSharp.Drawing.Processing;
using System.Linq;

namespace ReZero.SuperAPI
{

/// <summary>
    /// ** 描述：验证码类
    /// ** 创始时间：2015-6-30
    /// ** 修改时间：-
    /// ** 修改人：sunkaixuan
    /// </summary>
    public class VerifyCodeSugar
    {
        private static readonly char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".ToCharArray();
        private static readonly Random random = new Random();
        internal static (string,byte[]) Create()
        {
            string code = GenerateCode(4);
            byte[] imageBytes = GenerateImage(code);
            return (code,imageBytes);
        }

private static string GenerateCode(int length)
        {
            StringBuilder sb = new StringBuilder(length);
            for (int i = 0; i < length; i++)
            {
                sb.Append(chars[random.Next(chars.Length)]);
            }
            return sb.ToString();
        }

private static byte[] GenerateImage(string code)
        {
            int width = 100;
            int height = 40;

using var image = new Image<Rgba32>(width, height);
            image.Mutate(ctx =>
            {
                ctx.Fill(Color.White);

var font = SystemFonts.CreateFont("Arial", 20);

var textOptions = new RichTextOptions(font)
                {
                    HorizontalAlignment = HorizontalAlignment.Center,
                    VerticalAlignment = VerticalAlignment.Center,
                    Origin = new PointF(width / 2f, height / 2f)
                };

ctx.DrawText(textOptions, code, Color.DarkBlue);
            });

using var ms = new MemoryStream();
            image.SaveAsPng(ms);
            return ms.ToArray();
        }

}
}

阿妮亚/ReZero

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