LazyCaptcha自定义随机验证码和字体的示例详解_实用技巧_

/// 
 /// 随机验证码 /// 
 public class RandomCaptcha : DefaultCaptcha { private static readonly Random random = new(); private static readonly CaptchaType[] captchaTypes = Enum.GetValues(); public RandomCaptcha(IOptionsSnapshot options, IStorage storage) : base(options, storage) { } /// 
 /// 更新选项 /// 
 ///  protected override void ChangeOptions(CaptchaOptions options) // 随机验证码类型 options.CaptchaType = captchaTypes[random.Next(0, captchaTypes.Length)]; // 当是算数运算时，CodeLength是指运算数个数 if (options.CaptchaType.IsArithmetic()) { options.CodeLength = 2; } else options.CodeLength = 4; // 如果包含中文时，使用kaiti字体，否则文字乱码 if (options.CaptchaType.ContainsChinese()) options.ImageOption.FontFamily = DefaultFontFamilys.Instance.Kaiti; options.ImageOption.FontSize = 24; options.ImageOption.FontFamily = DefaultFontFamilys.Instance.Actionj; // 动静随机 options.ImageOption.Animation = random.Next(2) == 0; // 干扰线随机 options.ImageOption.InterferenceLineCount = random.Next(1, 4); // 气泡随机 options.ImageOption.BubbleCount = random.Next(1, 4); // 其他选项... } 

// 内存存储， 基于appsettings.json配置 builder.Services.AddCaptcha(builder.Configuration); // 开启随机验证码 builder.Services.Add(ServiceDescriptor.Scoped()); 

public class ResourceFontFamilysFinder { private static Lazy> _fontFamilies = new Lazy>(() => { var fontFamilies = new List(); var assembly = Assembly.GetExecutingAssembly(); var names = assembly.GetManifestResourceNames(); if (names?.Length > 0 == true) { var fontCollection = new FontCollection(); foreach (var name in names) { if (!name.EndsWith("ttf")) continue; fontFamilies.Add(fontCollection.Add(assembly.GetManifestResourceStream(name))); } } return fontFamilies; }); public static FontFamily Find(string name) return _fontFamilies.Value.First(e => e.Name == name); } } 

// 内存存储， 基于appsettings.json配置 builder.Services.AddCaptcha(builder.Configuration, options => { // 自定义字体 options.ImageOption.FontSize = 28; options.ImageOption.FontFamily = ResourceFontFamilysFinder.Find("KG HAPPY"); // 字体的名字在打开ttf文件时会显示 });