net6之后不支持system.drawing了，发给你个我用ImageSharp改造的绘制验证码的，imagesharp支持linux国产化

using Gs_Class;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
//
//using System.Drawing;
//using System.Drawing.Imaging;
using SixLabors.Fonts;
//using SixLabors.ImageSharp.Drawing;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using static System.Net.Mime.MediaTypeNames;
using System.Numerics;
using SixLabors.ImageSharp.Drawing.Processing;
using iPublic;
//using log4net;

namespace 外围辅助.Pages.SysTools
{
    /// <summary>
    /// 验证码页面
    /// 修改记录：
    ///   20240601，zch
    /// </summary>
    public class VerifyCodeModel : PageModel
    {
        public byte[] imageBytes = null;
        public ILogger logger = null;

public VerifyCodeModel(ILogger<VerifyCodeModel> ALogger)
        {
            logger = ALogger;
        }

public void OnGet()
        {   
            string defaultCode = httpTools.getRequestValueFirst(Request, "", "default");
            VerifyCoder verify = new VerifyCoder(HttpContext,logger, defaultCode).saveToSession();
            imageBytes = verify.getCodeByteArr();
            if (logger != null) logger.LogInformation("生成验证码：" + verify.code + ",图片数组长度：" + (imageBytes == null ? "null" : imageBytes.Length));

////下面这段代码，用iis运行没问题，用linux的kestrel报错：Headers are read-only, response has already started.
            ///加上这行ContentLength就不报错了
            Response.ContentLength = imageBytes.Length;
            Response.ContentType = "image/gif";
            Response.Body.WriteAsync(imageBytes);
        }
        
    }

/// <summary>
    /// 验证码后台接口
    /// 修改记录：
    ///   20240613，zch，从老项目复制过来
    /// </summary>
    [Route("SysTools/[controller]")]
    [ApiController]
    public class VerifyCodeApiController : ControllerBase
    {
        public ILogger<VerifyCodeApiController> logger = null;
        public IHostEnvironment env = null;
        public VerifyCodeApiController(ILogger<VerifyCodeApiController> ALogger, IHostEnvironment AEnv)
        {
            logger = ALogger;
            env = AEnv;
        }

[HttpGet("getVerifyCode")]
        [ResponseCache(Duration = 0)]
        public IActionResult getVerifyCode()
        {
            byte[] imageBytes = new VerifyCoder(HttpContext, logger)
                .saveToSession()
                .getCodeByteArr();
            return File(imageBytes, "image/gif");
        }

}

#region //VerifyCoder，验证码
    /// <summary>
    /// 验证码，海宏软件，20130608，用法：
    /// 1：发布到controller：
    ///     [HttpGet]
    ///     [ResponseCache(Duration=0)]
    ///     public IActionResult getVerifyCode()
    ///     {
    ///         return File(new VerifyCoder(HttpContext).getNewCodeByteArr(), "image/gif");
    ///     }
    /// 2：页面引用：
    ///     <img src="/SysTools/getVerifyCode" onclick="this.src='../SysTools/getVerifyCode?_t='+Date.now().toString()" />
    /// 3：判断验证：取Session["VerifyCode"]与输入框比对
    /// </summary>
    public partial class VerifyCoder //: System.Web.UI.Page
    {
        public string defaultCode = "";
        public string code = "";
        public HttpContext httpContext = null;
        public ILogger logger = null;
        public string fontPath = "";
        private static Color BackColor = Color.White;
        public int Width = 80;          //52、100、75、
        public int Height = 20;         //21、30、20、
        public int fontSize = 24;       //12、32、24、

public VerifyCoder(HttpContext AHttpContext, ILogger ALogger = null, string ACode = "")
        {
            httpContext = AHttpContext;
            logger = ALogger;
            if (_random == null) _random = new Random();
            //
            if (!string.IsNullOrEmpty(ACode)) code = defaultCode = ACode.Trim(); else code = GetRandomCode();
            if (logger != null) logger.LogInformation(GetType() + "-初始化code：" + code);
            this.SetPageNoCache();
        }
        public VerifyCoder refreshCode()
        {
            code = defaultCode = GetRandomCode();
            if (logger != null) logger.LogInformation(GetType() + "-refreshCode：刷新code：" + defaultCode);
            return this;
        }

//public Image<Rgba32> getNewCodeImage()
        //{

//    Image<Rgba32> bitmap = null;
        //    try
        //    {
        //        if (_random == null) _random = new Random();
        //        //生成码，默认码
        //        if (string.IsNullOrEmpty(code) && !string.IsNullOrEmpty(defaultCode)) code = defaultCode; else code = GetRandomCode();
        //        if (logger != null) logger.LogInformation(GetType() + "-getNewCodeImage：当前code：" + code + ",准备获取图片");

//        //// TODO : use Session["code"] save the VerifyCode 
        //        //httpContext.Session.Set("VerifyCode", System.Text.ASCIIEncoding.Default.GetBytes(this.code));
        //        bitmap = this.getCodeImage();
        //    }
        //    catch (Exception x)
        //    {
        //        if (logger != null) logger.LogError(x, GetType() + "-getNewCodeImage：" + x.Message);
        //    }
        //    return bitmap;
        //}

public VerifyCoder saveToSession(ISession ASession = null)
        {
            var Session = ASession;
            try
            {
                if (Session == null && httpContext != null) Session = httpContext.Session;
                if (logger != null) logger.LogInformation(GetType() + "-saveToSession：" + code + "，SessionID：" + (Session == null ? "null" : Session.Id));
                Session.SetString("VerifyCode", code);
            }
            catch (Exception x)
            {
                if (logger != null) logger.LogError(x, GetType() + "-saveToSession：" + x.Message);
            }
            return this;
        }

public byte[] getCodeByteArr()
        {
            byte[] arr = null;
            Image<Rgba32> bmp = null;
            MemoryStream ms = null;
            try
            {
                if (logger != null) logger.LogInformation(GetType() + "-getNewCodeByteArr：1当前code：" + code + ",准备获取图片");
                bmp = getCodeImage();
                //流
                ms = new MemoryStream();
                if (logger != null) logger.LogInformation(GetType() + "-getNewCodeByteArr：2当前code：" + code + ",准备存图片入流.bmp尺寸:" + (bmp == null ? "null" : bmp.Size));
                //bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);   //Jpeg
                bmp.SaveAsGif(ms);
                if (logger != null) logger.LogInformation(GetType() + "-getNewCodeByteArr：3当前code：" + code + ",准备存流入byte[]数组.Stream尺寸:" + (ms == null ? "null" : ms.Length));
                arr = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(arr, 0, (int)ms.Length);
                if (logger != null) logger.LogInformation(GetType() + "-getNewCodeByteArr：4当前code：" + code + ",已写入byte[]数组.尺寸:" + (arr == null ? "null" : arr.Length));
            }
            catch (Exception x) { }
            finally
            {
                if (ms != null) ms.Close();
            }
            return arr;
        }

/// <summary> 
        /// 绘画事件 
        /// </summary> 
        public Image<Rgba32> getCodeImage()
        {
            Image<Rgba32> image = null;
            SixLabors.ImageSharp.Color[] color = { SixLabors.ImageSharp.Color.Black, SixLabors.ImageSharp.Color.Red, SixLabors.ImageSharp.Color.Blue, SixLabors.ImageSharp.Color.Green, SixLabors.ImageSharp.Color.Orange, SixLabors.ImageSharp.Color.Brown, SixLabors.ImageSharp.Color.DarkBlue };
            //string[] font = { "Times New Roman" };
            string s = "", sDir = fontPath, sClass = "getCodeImage";
            //需要将字体放到项目中
            string[] fonts = { "Arial.ttf" };
            char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
            Random rnd = new Random();
            ////生成验证码字符串
            //string code = string.Empty;
            //for (int i = 0; i < 4; i++) code += character[rnd.Next(character.Length)];
            //写入Session用于验证码校验，可以对校验码进行加密，提高安全性
            //System.Web.HttpContext.Current.Session["verifyCode"] = chkCode;
            try
            {
                //创建画布
                image = new Image<Rgba32>(Width, Height);
                image.Mutate(x => x.BackgroundColor(SixLabors.ImageSharp.Color.White));
                //Bitmap bmp = new Bitmap(codeW, codeH - 3);
                if (logger != null) logger.LogInformation(sClass + "-1创建画布:" + Width + "*" + Height);

//Graphics g = Graphics.FromImage(bmp);
                //填充背景颜色为白色
                //g.Clear(Color.White);

//画噪线
                for (int i = 0; i < 3; i++)
                {
                    int x1 = rnd.Next(Width);
                    int y1 = rnd.Next(Height);
                    int x2 = rnd.Next(Width);
                    int y2 = rnd.Next(Height);

if (logger != null) logger.LogInformation(sClass + "-2画躁线:" + x1 + "," + y1 + "," + x2 + "," + y2);
                    image.Mutate(x =>
                        //画实线
                        x.DrawLine(
                            color[rnd.Next(color.Length)], //字体颜色
                            1,   //字体大小
                            new SixLabors.ImageSharp.PointF[]{
                                new Vector2(x1, y1),
                                new Vector2(x2, y2)
                            } //两点一线坐标
                        ));

//Color clr = color[rnd.Next(color.Length)];
                    //g.DrawLine(new Pen(clr), x1, y1, x2, y2);
                }

//string bPath = $"{Directory.GetCurrentDirectory()}font/";
                //string bPath = "C:\\Windows\\Fonts";
                //var bPath = Environment.CurrentDirectory;
                //var install_Family = fontTmp.Add($"font/ARIAL.TTF");
                //var install_Family = fontTmp.Add($"ARIAL.TTF");

//var install_Family = fontTmp.Add($"C:/Windows/Fonts/ARIAL.TTF");
                //var install_Family = fontTmp.Add($"C:/Windows/Fonts/Arial/ARIAL.TTF");
                //字库路径
                if (string.IsNullOrEmpty(sDir) || !Directory.Exists(sDir))
                {
                    showInfo(sClass + "-3:准备查找字库路径，当前路径:" + Environment.CurrentDirectory);
                    showInfo(sDir = iDefine.findSysDirectory("SysData", s = Environment.CurrentDirectory));
                    if (Directory.Exists(sDir)) showInfo(sDir = Path.Combine(Path.GetDirectoryName(sDir), "wwwroot", "css", "font"));
                    if (!Directory.Exists(sDir))
                    {
                        showInfo(sDir = Path.Combine(Path.GetDirectoryName(s), "主程序", "SysData"));
                        if (Directory.Exists(sDir)) showInfo(sDir = Path.Combine(Path.GetDirectoryName(sDir), "wwwroot", "css", "font"));
                    }
                }
                if (logger != null) logger.LogInformation(sClass + "-3字库路径:" + sDir);
                //画验证码
                for (int i = 0; i < code.Length; i++)
                {
                    string fnt = fonts[rnd.Next(fonts.Length)];
                    ////var install_Family = new FontCollection().Add(System.IO.Path.Combine(bPath, fnt));
                    var fontTmp = new FontCollection();

//var bPath = Environment.CurrentDirectory;
                    //var install_Family = fontTmp.Add($"font/ARIAL.TTF");
                    //var install_Family = fontTmp.Add($"ARIAL.TTF");
                    var install_Family = fontTmp.Add(s = Path.Combine(sDir, "Arial.ttf"));
                    if (logger != null) logger.LogInformation("  4." + i + "-字库文件:" + s);

//var install_Family = fontTmp.Add($"C:/Windows/Fonts/ARIAL.TTF");
                    //var install_Family = fontTmp.Add($"C:/Windows/Fonts/Arial/ARIAL.TTF");
                    var font = new SixLabors.Fonts.Font(install_Family, fontSize, FontStyle.Bold);
                    if (logger != null) logger.LogInformation("  4." + i + "-绘制文字:" + code[i]);
                    image.Mutate(x => x
                      .DrawText(
                        code[i].ToString(),   //文字内容
                          font,
                          color[rnd.Next(color.Length)],
                          new Vector2((float)i * Width / (code.Length), (float)0)) //new Vector2((float)i * 20, (float)0))
                      );

//将文字写到画布上
                    //Font ft = new Font(fnt, fontSize);
                    //   Color clr = color[rnd.Next(color.Length)];
                    //   g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
                }

//画图片的前景噪音点
                if (logger != null) logger.LogInformation(sClass + "-5绘制前景噪点." + "");
                for (int i = 0; i < 15; i++)
                {
                    int x1 = rnd.Next(Width);
                    int y1 = rnd.Next(Height);
                    int x2 = x1 + 2;
                    int y2 = y1 + 2;

image.Mutate(x =>
                        x.DrawLine( //画实线
                            color[rnd.Next(color.Length)], //字体颜色
                            2,   //字体大小
                            new SixLabors.ImageSharp.PointF[]{
                                new Vector2(x1, y1),
                                new Vector2(x2, y2)
                            } //两点一线坐标
                        ));
                }

//SixLabors.ImageSharp.Formats.Png.PngTextData
                //IImageFormat bFormat = new Formats;
                //ImgStr = image.ToBase64String(SixLabors.ImageSharp.Formats.Png.PngFormat.Instance);

//image.SaveAsJpeg($"./img/test.jpg");
                //System.Drawing.Image bImg = System.Drawing.Image.FromFile($"./img/test.jpg");

}
            catch (Exception x)
            {
                string aMsg = x.Message;
                if (logger != null) logger.LogError(x, sClass + ":" + x.Message + "\r\n" + x.StackTrace);
            }
            return image;
            Image<Rgba32> g = null, objBitmap = null;
            try
            {
                //if (logger != null) logger.LogInformation(GetType() + "-getCodeImage-1：当前code：" + code + ",准备生成图片，尺寸:" + Width + "*" + Height);
                //objBitmap = new Image<Rgba32>(Width, Height);
                //g = Graphics.FromImage(objBitmap);

//if (logger != null) logger.LogInformation(GetType() + "-getCodeImage-2-背景：当前code：" + code);
                //Paint_Background(g);
                //if (logger != null) logger.LogInformation(GetType() + "-getCodeImage-3-文字：当前code：" + code);
                //Paint_Text(g);
                //if (logger != null) logger.LogInformation(GetType() + "-getCodeImage-4-噪音点-TextStain：当前code：" + code);
                //Paint_TextStain(objBitmap);
                //if (logger != null) logger.LogInformation(GetType() + "-getCodeImage-5-Border：当前code：" + code);
                //Paint_Border(g);
            }
            catch (Exception x)
            {
                if (logger != null) logger.LogError(x, GetType() + "-getCodeImage：当前code：" + this.code + "," + x.Message);
            }
            finally
            {
                //if (null != objBitmap) objBitmap.Dispose();
                if (null != g) g.Dispose();
            }
            return objBitmap;
        }

public void showInfo(string sInfo, bool lTime = true)
        {
            if (logger == null) return;
            logger.LogInformation(sInfo);
        }
        
        private Random _random = null;
        private int _brushNameIndex;

static string[] FontItems = new string[]{
            "Arial",
            "Helvetica",
            "Geneva",
            "sans-serif",
            "Verdana"
        };
        //static Brush[] BrushItems = new Brush[] { Brushes.OliveDrab,
        //    Brushes.ForestGreen,
        //    Brushes.DarkCyan,
        //    Brushes.LightSlateGray,
        //    Brushes.RoyalBlue,
        //    Brushes.SlateBlue,
        //    Brushes.DarkViolet,
        //    Brushes.MediumVioletRed,
        //    Brushes.IndianRed,
        //    Brushes.Firebrick,
        //    Brushes.Chocolate,
        //    Brushes.Peru,
        //    Brushes.Goldenrod
        //};
        //static string[] BrushName = new string[] { "OliveDrab",
        //    "ForestGreen",
        //    "DarkCyan",
        //    "LightSlateGray",
        //    "RoyalBlue",
        //    "SlateBlue",
        //    "DarkViolet",
        //    "MediumVioletRed",
        //    "IndianRed",
        //    "Firebrick",
        //    "Chocolate",
        //    "Peru",
        //    "Goldenrod"
        //};

/// <summary>
        /// 设置页面不被缓存 
        /// </summary> 
        private void SetPageNoCache()
        {
            return;
            var Response = httpContext.Response;
            //Response.Buffer = true;
            //Response.ExpiresAbsolute = System.DateTime.Now.AddSeconds(-1);
            //Response.Expires = 0;
            //Response.CacheControl = "no-cache";
            Response.Headers.Append("Pragma", "No-Cache");
            Response.Headers.Append("Cache-Control", "max-age=0");  //缓存0秒
        }

/// <summary> 
        /// 取得一个 4 位的随机码 
        /// </summary> 
        /// <returns></returns> 
        private string GetRandomCode()
        {
            string s = code, s2 = Guid.NewGuid().ToString().Substring(0, 4);
            if (logger != null) logger.LogInformation(GetType() + "-GetRandomCode：刷新" + s + "=>" + s2);
            return s2;
        }
    }
    #endregion

}

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