diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index dbf0fba..7801117 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 8.0.x
         
     - name: Restore Lib
       run: dotnet restore ./Src
diff --git a/README.md b/README.md
index 5748a5f..bce8f9a 100644
--- a/README.md
+++ b/README.md
@@ -7,12 +7,12 @@
 [CaptchaN-DI-Microsoft-SvgUrl]: https://img.shields.io/nuget/v/CaptchaN.DI.Microsoft.svg
 [CaptchaN-DI-Microsoft-NugetUrl]: https://www.nuget.org/packages/CaptchaN.DI.Microsoft
 
-![Image Demo](https://github.com/LeaFrock/CaptchaN/blob/main/Images/name.jpeg)
+![Image Demo](https://raw.githubusercontent.com/LeaFrock/CaptchaN/main/Images/name.jpeg)
 
 Generate captcha images based on [ImageSharp][ImageSharpUrl] and .NET.
 >基于[ImageSharp][ImageSharpUrl]项目和.NET，生成图形验证码。
 
-[![.NET 6](https://img.shields.io/badge/.NET-6-brightgreen)][DotNetUrl]
+[![.NET 8](https://img.shields.io/badge/.NET-8-brightgreen)][DotNetUrl]
 ![License](https://img.shields.io/badge/License-MIT-green)
 
 ## Packages |Nuget包
diff --git a/Samples/CaptchaN.WebApi/CaptchaN.WebApi.csproj b/Samples/CaptchaN.WebApi/CaptchaN.WebApi.csproj
index c9495e4..a5a5a15 100644
--- a/Samples/CaptchaN.WebApi/CaptchaN.WebApi.csproj
+++ b/Samples/CaptchaN.WebApi/CaptchaN.WebApi.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
 	<ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/Samples/CaptchaN.WebApi/Controllers/CaptchaController.cs b/Samples/CaptchaN.WebApi/Controllers/CaptchaController.cs
deleted file mode 100644
index cf272d3..0000000
--- a/Samples/CaptchaN.WebApi/Controllers/CaptchaController.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-using CaptchaN.Abstractions;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Options;
-
-namespace CaptchaN.WebApi.Controllers
-{
-    [ApiController]
-    [Route("[controller]")]
-    public class CaptchaController : ControllerBase
-    {
-        private readonly IPainter _painter;
-        private readonly ICodeTextGenerator _codeTextGenerator;
-        private readonly PainterOption _painterOption;
-
-        public CaptchaController(
-            IOptions<PainterOption> painterOpt,
-            ICodeTextGenerator codeTextGenerator,
-            IPainter painter)
-        {
-            _painterOption = painterOpt.Value;
-            _codeTextGenerator = codeTextGenerator;
-            _painter = painter;
-        }
-
-        [HttpGet]
-        public async Task<IActionResult> Get()
-        {
-            string codeText = _codeTextGenerator.Generate(4);
-            var image = await _painter.GenerateImageAsync(codeText, _painterOption);
-            return File(image, "image/jpeg; charset=UTF-8");
-        }
-    }
-}
\ No newline at end of file
diff --git a/Samples/CaptchaN.WebApi/Program.cs b/Samples/CaptchaN.WebApi/Program.cs
index 8e22404..052b7a4 100644
--- a/Samples/CaptchaN.WebApi/Program.cs
+++ b/Samples/CaptchaN.WebApi/Program.cs
@@ -1,17 +1,22 @@
-namespace CaptchaN.WebApi
+using CaptchaN.Abstractions;
+using CaptchaN.Factories;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.Extensions.Options;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.Configure<PainterOption>(builder.Configuration.GetSection("CaptchaN"));
+builder.Services.AddCaptchaN()
+                //.UseFontRandomer(new SystemFontRandomerFactory());
+                .UseFontRandomer(new DirectoryFontRandomerFactory() { FontDir = new(Path.Combine(builder.Environment.ContentRootPath, "Fonts")) });
+
+var app = builder.Build();
+
+app.MapGet("/captcha", async Task<FileContentHttpResult> (IOptions<PainterOption> painterOpt, ICodeTextGenerator codeTextGenerator, IPainter painter) =>
 {
-    public class Program
-    {
-        public static void Main(string[] args)
-        {
-            CreateHostBuilder(args).Build().Run();
-        }
+    var codeText = codeTextGenerator.Generate(4);
+    var image = await painter.GenerateImageAsync(codeText, painterOpt.Value);
+    return TypedResults.File(image, "image/jpeg; charset=UTF-8");
+});
 
-        public static IHostBuilder CreateHostBuilder(string[] args) =>
-            Host.CreateDefaultBuilder(args)
-                .ConfigureWebHostDefaults(webBuilder =>
-                {
-                    webBuilder.UseStartup<Startup>();
-                });
-    }
-}
+app.Run();
\ No newline at end of file
diff --git a/Samples/CaptchaN.WebApi/Properties/launchSettings.json b/Samples/CaptchaN.WebApi/Properties/launchSettings.json
index b8b48b3..b032cb2 100644
--- a/Samples/CaptchaN.WebApi/Properties/launchSettings.json
+++ b/Samples/CaptchaN.WebApi/Properties/launchSettings.json
@@ -9,20 +9,12 @@
     }
   },
   "profiles": {
-    "IIS Express": {
-      "commandName": "IISExpress",
-      "launchBrowser": true,
-      "launchUrl": "captcha",
-      "environmentVariables": {
-        "ASPNETCORE_ENVIRONMENT": "Development"
-      }
-    },
     "CaptchaN.WebApi": {
       "commandName": "Project",
-      "dotnetRunMessages": "true",
+      "dotnetRunMessages": true,
       "launchBrowser": true,
       "launchUrl": "captcha",
-      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "applicationUrl": "http://localhost:5000",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }
diff --git a/Samples/CaptchaN.WebApi/README.md b/Samples/CaptchaN.WebApi/README.md
index 5cb8b80..3ba915f 100644
--- a/Samples/CaptchaN.WebApi/README.md
+++ b/Samples/CaptchaN.WebApi/README.md
@@ -1,4 +1,4 @@
 # CaptchaN.WebApi
 
-Before the first running, please create a directory called `Fonts` at the same level of `Controllers`, then put your font files `*.ttf` into `Fonts`.
->在第一次运行前，请先创建一个与`Controllers`同级的文件夹，命名为`Fonts`，然后将你的`*.ttf`格式字体文件放入其中。
+Before the first running, please create a directory called `Fonts` at the same level of `Program.cs`, then put your font files `*.ttf` into `Fonts`.
+>在第一次运行前，请先创建一个与`Program.cs`同级的文件夹，命名为`Fonts`，然后将你的`*.ttf`格式字体文件放入其中。
diff --git a/Samples/CaptchaN.WebApi/Startup.cs b/Samples/CaptchaN.WebApi/Startup.cs
deleted file mode 100644
index 5a1417e..0000000
--- a/Samples/CaptchaN.WebApi/Startup.cs
+++ /dev/null
@@ -1,50 +0,0 @@
-using CaptchaN.Abstractions;
-using CaptchaN.Factories;
-
-namespace CaptchaN.WebApi
-{
-    public class Startup
-    {
-        public Startup(IConfiguration configuration, IWebHostEnvironment env)
-        {
-            Configuration = configuration;
-            HostEnvironment = env;
-        }
-
-        public IConfiguration Configuration { get; }
-
-        protected IWebHostEnvironment HostEnvironment { get; }
-
-        // This method gets called by the runtime. Use this method to add services to the container.
-        public void ConfigureServices(IServiceCollection services)
-        {
-            services.AddControllers();
-
-            services.Configure<PainterOption>(Configuration.GetSection("CaptchaN"));
-            services.AddCaptchaN()
-                //.UseFontRandomer(new SystemFontRandomerFactory());
-                .UseFontRandomer(new DirectoryFontRandomerFactory() { FontDir = new(Path.Combine(HostEnvironment.ContentRootPath, "Fonts")) });
-        }
-
-        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
-        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
-        {
-            if (env.IsDevelopment())
-            {
-                app.UseDeveloperExceptionPage();
-            }
-
-            app.UseStaticFiles();
-            app.UseHttpsRedirection();
-
-            app.UseRouting();
-
-            app.UseAuthorization();
-
-            app.UseEndpoints(endpoints =>
-            {
-                endpoints.MapControllers();
-            });
-        }
-    }
-}
\ No newline at end of file
diff --git a/Src/CaptchaN.DI.Microsoft/CaptchaN.DI.Microsoft.csproj b/Src/CaptchaN.DI.Microsoft/CaptchaN.DI.Microsoft.csproj
index c1dd674..0282c94 100644
--- a/Src/CaptchaN.DI.Microsoft/CaptchaN.DI.Microsoft.csproj
+++ b/Src/CaptchaN.DI.Microsoft/CaptchaN.DI.Microsoft.csproj
@@ -1,28 +1,36 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
 	<ImplicitUsings>enable</ImplicitUsings>
-
+	<LangVersion>latest</LangVersion>
     <PackageId>CaptchaN.DI.Microsoft</PackageId>
     <Title>CaptchaN.DI.Microsoft</Title>
     <Authors>LeaFrock</Authors>
-    <Version>1.1.0</Version>
+    <Version>3.0.0</Version>
     <Product>CaptchaN.DI.Microsoft</Product>
     <Description>CaptchaN DI for .NET default container.</Description>
-    <Copyright>Copyright © LeaFrock 2022</Copyright>
+    <Copyright>Copyright © LeaFrock 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageTags>captcha;imagesharp</PackageTags>
     <PackageProjectUrl>https://github.com/LeaFrock/CaptchaN</PackageProjectUrl>
     <RepositoryUrl>https://github.com/LeaFrock/CaptchaN.git</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
-    <PackageReleaseNotes>Upgrade to ImageSharp 2.0</PackageReleaseNotes>
+    <PackageReleaseNotes>Add support for .NET 8</PackageReleaseNotes>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
+	<PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CaptchaN" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CaptchaN\CaptchaN.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+  	<None Include="..\..\README.md" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
 </Project>
diff --git a/Src/CaptchaN.DI.Microsoft/PainterBuilder.cs b/Src/CaptchaN.DI.Microsoft/PainterBuilder.cs
index dede9d3..3a0ac21 100644
--- a/Src/CaptchaN.DI.Microsoft/PainterBuilder.cs
+++ b/Src/CaptchaN.DI.Microsoft/PainterBuilder.cs
@@ -36,10 +36,9 @@ public PainterBuilder UseFontRandomer<T>() where T : class, IFontRandomer
         public PainterBuilder UseFontRandomer(IFontRandomerFactory fontRandomerFactory)
         {
             var fontRandomer = fontRandomerFactory.CreateFontRandomer();
-            if (fontRandomer is null)
-            {
-                throw new NullReferenceException("Created FontRandomer is null.");
-            }
+
+            ArgumentNullException.ThrowIfNull(fontRandomer);
+
             _services.AddSingleton(fontRandomer);
             return this;
         }
diff --git a/Src/CaptchaN/CaptchaN.csproj b/Src/CaptchaN/CaptchaN.csproj
index 57ea874..f27ef61 100644
--- a/Src/CaptchaN/CaptchaN.csproj
+++ b/Src/CaptchaN/CaptchaN.csproj
@@ -1,27 +1,32 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
 	<ImplicitUsings>enable</ImplicitUsings>
-
+	<LangVersion>latest</LangVersion>
     <PackageId>CaptchaN</PackageId>
     <Title>CaptchaN</Title>
     <Authors>LeaFrock</Authors>
-    <Version>2.0.1</Version>
+    <Version>3.0.0</Version>
     <Product>CaptchaN</Product>
     <Description>Core module of generating captcha images.</Description>
-    <Copyright>Copyright © LeaFrock 2022</Copyright>
+    <Copyright>Copyright © LeaFrock 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageTags>captcha;imagesharp</PackageTags>
     <PackageProjectUrl>https://github.com/LeaFrock/CaptchaN</PackageProjectUrl>
     <RepositoryUrl>https://github.com/LeaFrock/CaptchaN.git</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
-    <PackageReleaseNotes>Upgrade to ImageSharp 2.1</PackageReleaseNotes>
+    <PackageReleaseNotes>Add support for .NET 8</PackageReleaseNotes>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
+	<PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="SixLabors.ImageSharp.Drawing" Version="1.0.0-beta15" />
+    <PackageReference Include="SixLabors.ImageSharp.Drawing" Version="2.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+	  <None Include="..\..\README.md" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
 </Project>
diff --git a/Src/CaptchaN/CodeTextGenerator.cs b/Src/CaptchaN/CodeTextGenerator.cs
index 859a6be..a701eab 100644
--- a/Src/CaptchaN/CodeTextGenerator.cs
+++ b/Src/CaptchaN/CodeTextGenerator.cs
@@ -1,26 +1,28 @@
 using CaptchaN.Abstractions;
-using CaptchaN.Helpers;
 
 namespace CaptchaN
 {
     public class CodeTextGenerator : ICodeTextGenerator
     {
-        private readonly static char[] _pool = new char[]
-        {
-            //Skip '0/o/O','1/l/I','9/g/q'
-            '2','3','4','5','6','7','8',
-            'a','b','c','d','e','f','h','i','j','k','m','n','p','r','s','t','u','v','w','x','y','z',
-            'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z',
-        };
+        //Skip '0/o/O','1/l/I','9/g/q'
+        private const string _pool = "2345678"
+            + "abcdefhijkmnprstuvwxyz"
+            + "ABCDEFGHJKLMNPQRSTUVWXYZ";
 
         public string Generate(int length)
         {
-            var random = RandomHelper.CurrentRandom;
-            Span<char> span = length <= 10 ? stackalloc char[length] : new char[length];
+            var random = Random.Shared;
+            Span<char> span = length <= 10
+                ? stackalloc char[length]
+                : new char[length]; // Will you do so?
+#if NET8_0_OR_GREATER
+            random.GetItems(_pool, span);
+#else
             for (int i = 0; i < length; i++)
             {
-                span[i] = _pool[random.Next(0, _pool.Length)];
+                span[i] = _pool[random.Next(_pool.Length)];
             }
+#endif
             return new string(span);
         }
     }
diff --git a/Src/CaptchaN/ColorRandomer.cs b/Src/CaptchaN/ColorRandomer.cs
index 022aedd..32599fc 100644
--- a/Src/CaptchaN/ColorRandomer.cs
+++ b/Src/CaptchaN/ColorRandomer.cs
@@ -1,13 +1,12 @@
 using CaptchaN.Abstractions;
-using CaptchaN.Helpers;
 using SixLabors.ImageSharp;
 
 namespace CaptchaN
 {
     public class ColorRandomer : IColorRandomer
     {
-        private readonly static Color[] _darkPool = new Color[]
-        {
+        private readonly static Color[] _darkPool =
+        [
             Color.Black,
             Color.MidnightBlue,
             Color.MediumBlue,
@@ -19,10 +18,10 @@ public class ColorRandomer : IColorRandomer
             Color.OrangeRed,
             Color.Maroon,
             Color.DarkViolet
-        };
+        ];
 
-        private readonly static Color[] _lightPool = new Color[]
-        {
+        private readonly static Color[] _lightPool =
+        [
             Color.White,
             Color.Snow,
             Color.GhostWhite,
@@ -47,7 +46,7 @@ public class ColorRandomer : IColorRandomer
             Color.LightYellow,
             Color.Pink,
             Color.PaleGreen
-        };
+        ];
 
         public Color RandomDark() => RandomColor(_darkPool);
 
@@ -55,7 +54,7 @@ public class ColorRandomer : IColorRandomer
 
         private static Color RandomColor(Color[] pool)
         {
-            int index = RandomHelper.CurrentRandom.Next(0, pool.Length);
+            int index = Random.Shared.Next(0, pool.Length);
             return pool[index];
         }
     }
diff --git a/Src/CaptchaN/FontRandomer.cs b/Src/CaptchaN/FontRandomer.cs
index 3b65328..a17b176 100644
--- a/Src/CaptchaN/FontRandomer.cs
+++ b/Src/CaptchaN/FontRandomer.cs
@@ -1,5 +1,4 @@
 using CaptchaN.Abstractions;
-using CaptchaN.Helpers;
 using SixLabors.Fonts;
 
 namespace CaptchaN
@@ -15,17 +14,22 @@ internal FontRandomer(FontCollection fontCollection) : this(fontCollection.Famil
         internal FontRandomer(FontFamily[] fontFamilies)
         {
             ArgumentNullException.ThrowIfNull(fontFamilies);
-            if(fontFamilies.Length < 1)
+#if NET8_0_OR_GREATER
+            ArgumentOutOfRangeException.ThrowIfLessThan(fontFamilies.Length, 1, nameof(fontFamilies));
+#else
+            if (fontFamilies.Length < 1)
             {
+
                 throw new ArgumentOutOfRangeException(nameof(fontFamilies), "Array length must be over 0.");
             }
+#endif
 
             _fontFamilies = fontFamilies;
         }
 
         public Font Random(float size, FontStyle fontStyle)
         {
-            int index = RandomHelper.CurrentRandom.Next(0, _fontFamilies.Length);
+            int index = System.Random.Shared.Next(_fontFamilies.Length);
 #if DEBUG
             System.Diagnostics.Debug.WriteLine(_fontFamilies[index].Name);
 #endif
diff --git a/Src/CaptchaN/Helpers/RandomHelper.cs b/Src/CaptchaN/Helpers/RandomHelper.cs
deleted file mode 100644
index 81cbfbf..0000000
--- a/Src/CaptchaN/Helpers/RandomHelper.cs
+++ /dev/null
@@ -1,7 +0,0 @@
-namespace CaptchaN.Helpers
-{
-    internal static class RandomHelper
-    {
-        public static Random CurrentRandom => Random.Shared;
-    }
-}
\ No newline at end of file
diff --git a/Src/CaptchaN/Painter.cs b/Src/CaptchaN/Painter.cs
index fe0d2f1..774d511 100644
--- a/Src/CaptchaN/Painter.cs
+++ b/Src/CaptchaN/Painter.cs
@@ -1,5 +1,4 @@
 using CaptchaN.Abstractions;
-using CaptchaN.Helpers;
 using SixLabors.Fonts;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.Drawing;
@@ -49,7 +48,7 @@ private Image<Rgba32> CreateImage(string codeText, PainterOption option)
 
             void Operate(IImageProcessingContext ctx)
             {
-                var random = RandomHelper.CurrentRandom;
+                var random = Random.Shared;
                 float fontSize = RandomFontSize(option.Width, option.Height, codeText.Length);
                 ctx.BackgroundColor(option.UseBlackWhiteOnly ? Color.White : _colorRandomer.RandomLight());
                 //.Glow(_colorRandomer.RandomLight())
@@ -108,7 +107,7 @@ void Operate(IImageProcessingContext ctx)
                     {
                         for (int i = 1; i < option.LineCount; i++)
                         {
-                            ctx.DrawLines(color: option.UseBlackWhiteOnly ? Color.Black : _colorRandomer.RandomDark(),
+                            ctx.DrawLine(color: option.UseBlackWhiteOnly ? Color.Black : _colorRandomer.RandomDark(),
                                 thickness: DefaultLineThickness,
                                 new PointF(random.Next(0, option.Width / 2), random.Next(1, option.Height)),
                                 new PointF(random.Next(option.Width / 2 + 1, option.Width), random.Next(1, option.Height))