ForEvolve · Carl-Hugo · Jun 18, 2025 · Jun 13, 2025 · Jun 13, 2025 · Jun 13, 2025
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
@@ -0,0 +1,3 @@
+{
+    "image": "mcr.microsoft.com/devcontainers/dotnet"
+}
diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
@@ -38,9 +38,8 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: |
-            6.x
-            7.x
             8.x
+            9.x
 
       - name: Build
         run: dotnet build -c ${{ env.BUILD_CONFIGURATION }}
@@ -60,9 +59,8 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: |
-            6.x
-            7.x
             8.x
+            9.x
 
       - uses: dotnet/nbgv@master
         with:

diff --git a/Directory.Build.props b/Directory.Build.props
@@ -6,7 +6,7 @@
         <RepositoryType>git</RepositoryType>
         <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
         <LangVersion>Latest</LangVersion>
-        <FETargetFrameworks>net6.0;net7.0;net8.0</FETargetFrameworks>
+        <FETargetFrameworks>net8.0;net9.0</FETargetFrameworks>
         <FETestsTargetFrameworks>$(FETargetFrameworks)</FETestsTargetFrameworks>
     </PropertyGroup>
 

diff --git a/README.md b/README.md
@@ -291,6 +291,12 @@ The prerelease CI builds are packaged and hosted at [feedz.io](feedz.io), thanks
 
 # Release notes
 
+## 4.0
+
+- Remove support for .NET 6 and .NET 7
+- Add support for .NET 9
+- Remove dependency on ForEvolve.Core library which means the base exception is now `Exception` instead of `ForEvolve.Exception`.
+
 ## 3.0
 
 Version 3 of ExceptionMapper is a major rewrite that simplifies the codebase and usage of the library. Here are a few important changes:

diff --git a/samples/WebApi.Minimal/Program.cs b/samples/WebApi.Minimal/Program.cs
@@ -9,15 +9,9 @@
 
 var builder = WebApplication.CreateBuilder(args);
 #if CHANGE_PROPERTY_NAME_POLICY
-#if NET8_0_OR_GREATER
 builder.Services.ConfigureHttpJsonOptions(options => {
     options.SerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseUpper;
 });
-#else
-builder.Services.Configure<JsonOptions>(options => {
-    options.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
-});
-#endif
 #endif
 builder.AddExceptionMapper(builder =>
 {
@@ -74,9 +68,7 @@
     "---[Others]---",
     "/fallback",
     "/a-url-that-does-not-exist",
-#if NET7_0_OR_GREATER
     "/fluent-validation?name=&description=&range=0",
-#endif
 });
 app.MapGet("/BadRequestException", context => throw new BadRequestException());
 app.MapGet("/ConflictException", context => throw new ConflictException());
@@ -96,7 +88,6 @@
 app.MapGet("/MyUnauthorizedException", context => throw new MyUnauthorizedException(Random.Shared.Next(100) % 2 == 0 ? "John" : "Jane"));
 
 app.MapGet("/fallback", context => throw new Exception("An error that gets handled by the fallback handler."));
-#if NET7_0_OR_GREATER
 app.MapGet("/fluent-validation", ([AsParameters] Entity entity) =>
 {
     var validator = new EntityValidator();
@@ -107,7 +98,6 @@
     }
     return TypedResults.Ok(entity);
 });
-#endif
 app.Run();
 
 

diff --git a/src/ForEvolve.ExceptionMapper/CommonExceptions/ClientErrorException.cs b/src/ForEvolve.ExceptionMapper/CommonExceptions/ClientErrorException.cs
@@ -4,7 +4,7 @@
 /// Client error responses (400 – 499)
 /// <br /><br />See also <seealso cref="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status#client_error_responses"/>
 /// </summary>
-public abstract class ClientErrorException : ForEvolveException
+public abstract class ClientErrorException : Exception
 {
     public ClientErrorException()
     {

diff --git a/src/ForEvolve.ExceptionMapper/CommonExceptions/ServerErrorException.cs b/src/ForEvolve.ExceptionMapper/CommonExceptions/ServerErrorException.cs
@@ -4,7 +4,7 @@
 /// Server error responses (500 – 599)
 /// <br /><br />See also <seealso cref="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status#server_error_responses"/>
 /// </summary>
-public abstract class ServerErrorException : ForEvolveException
+public abstract class ServerErrorException : Exception
 {
     public ServerErrorException()
     {

diff --git a/src/ForEvolve.ExceptionMapper/DependencyInjection/ServiceCollectionExtensions.cs b/src/ForEvolve.ExceptionMapper/DependencyInjection/ServiceCollectionExtensions.cs
@@ -53,23 +53,16 @@ public static WebApplicationBuilder AddExceptionMapper(this WebApplicationBuilde
 
     private static void AddSerializationHandler(this IServiceCollection services, IConfiguration configuration)
     {
-#if NET7_0_OR_GREATER
         services.ConfigureHttpJsonOptions(options => {
             options.SerializerOptions.DictionaryKeyPolicy = options.SerializerOptions.PropertyNamingPolicy;
         });
-#endif
         services
             .AddOptions<ProblemDetailsSerializationOptions>()
             .Bind(configuration.GetSection("ExceptionMapper:ProblemDetailsSerialization"))
             .ValidateOnStart()
         ;
         services.AddSingleton(sp => sp.GetRequiredService<IOptions<ProblemDetailsSerializationOptions>>().Value);
-#if NET7_0_OR_GREATER
         services.AddProblemDetails();
-#endif
-        // Workaround: binding a local copy of the DefaultProblemDetailsFactory because the .NET class is internal.
-        // Moreover, the only way to add the class is by calling the AddMvcCore method, which add way more services.
-        // So until we can add the DefaultProblemDetailsFactory
         services.TryAddSingleton<ProblemDetailsFactory, DefaultProblemDetailsFactory>();
         services.TryAddSingleton<IExceptionSerializer, ProblemDetailsSerializationHandler>();
     }

diff --git a/src/ForEvolve.ExceptionMapper/ForEvolve.ExceptionMapper.csproj b/src/ForEvolve.ExceptionMapper/ForEvolve.ExceptionMapper.csproj
@@ -7,10 +7,13 @@
 
     <ItemGroup>
         <FrameworkReference Include="Microsoft.AspNetCore.App" />
-        <PackageReference Include="ForEvolve.Core" Version="2.3.5" />
     </ItemGroup>
     <ItemGroup>
-        <None Include="../../README.md" Pack="true" PackagePath="\"/>
-        <None Include="../../LICENSE" Pack="true" PackagePath="\"/>
+        <None Include="../../README.md" Pack="true" PackagePath="\" />
+        <None Include="../../LICENSE" Pack="true" PackagePath="\" />
+    </ItemGroup>
+    <ItemGroup>
+      <PackageReference Update="Microsoft.SourceLink.GitHub" Version="8.0.0" />
+      <PackageReference Update="Nerdbank.GitVersioning" Version="3.7.115" />
     </ItemGroup>
 </Project>
diff --git a/src/ForEvolve.ExceptionMapper/Serialization/DefaultProblemDetailsFactory.cs b/src/ForEvolve.ExceptionMapper/Serialization/DefaultProblemDetailsFactory.cs
@@ -1,4 +1,6 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Load this only for .NET 8.
+#if !NET9_0_OR_GREATER
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.AspNetCore.Http;
@@ -100,43 +102,4 @@ private void ApplyProblemDetailsDefaults(HttpContext httpContext, ProblemDetails
         _configure?.Invoke(new() { HttpContext = httpContext!, ProblemDetails = problemDetails });
     }
 }
-
-#if NET6_0
-public class ProblemDetailsOptions
-{
-    /// <summary>
-    /// The operation that customizes the current <see cref="Mvc.ProblemDetails"/> instance.
-    /// </summary>
-    public Action<ProblemDetailsContext>? CustomizeProblemDetails { get; set; }
-}
-
-public class ProblemDetailsContext
-{
-    private ProblemDetails? _problemDetails;
-
-    /// <summary>
-    /// The <see cref="HttpContext"/> associated with the current request being processed by the filter.
-    /// </summary>
-    public HttpContext? HttpContext { get; init; }
-
-    /// <summary>
-    /// A collection of additional arbitrary metadata associated with the current request endpoint.
-    /// </summary>
-    public EndpointMetadataCollection? AdditionalMetadata { get; init; }
-
-    /// <summary>
-    /// An instance of <see cref="ProblemDetails"/> that will be
-    /// used during the response payload generation.
-    /// </summary>
-    public ProblemDetails ProblemDetails
-    {
-        get => _problemDetails ??= new ProblemDetails();
-        set => _problemDetails = value;
-    }
-
-    /// <summary>
-    /// The exception causing the problem or <c>null</c> if no exception information is available.
-    /// </summary>
-    public Exception? Exception { get; init; }
-}
-#endif
+#endif
diff --git a/src/ForEvolve.ExceptionMapper/Serialization/Json/ProblemDetailsSerializationHandler.cs b/src/ForEvolve.ExceptionMapper/Serialization/Json/ProblemDetailsSerializationHandler.cs
@@ -17,15 +17,11 @@ public class ProblemDetailsSerializationHandler : IExceptionSerializer
     private readonly ProblemDetailsFactory _problemDetailsFactory;
     private readonly IHostEnvironment _hostEnvironment;
     private readonly ProblemDetailsSerializationOptions _options;
-#if NET7_0_OR_GREATER
     private readonly IProblemDetailsService _problemDetailsService;
-#endif
     private readonly JsonSerializerOptions _jsonSerializerOptions;
 
     public ProblemDetailsSerializationHandler(
-#if NET7_0_OR_GREATER
         IProblemDetailsService problemDetailsService,
-#endif
         ProblemDetailsFactory problemDetailsFactory,
         IHostEnvironment hostEnvironment,
         ProblemDetailsSerializationOptions options,
@@ -34,9 +30,7 @@ public ProblemDetailsSerializationHandler(
         _problemDetailsFactory = problemDetailsFactory ?? throw new ArgumentNullException(nameof(problemDetailsFactory));
         _hostEnvironment = hostEnvironment ?? throw new ArgumentNullException(nameof(hostEnvironment));
         _options = options ?? throw new ArgumentNullException(nameof(options));
-#if NET7_0_OR_GREATER
         _problemDetailsService = problemDetailsService ?? throw new ArgumentNullException(nameof(problemDetailsService));
-#endif
         _jsonSerializerOptions = jsonOptions.Value.SerializerOptions ?? throw new ArgumentNullException(nameof(jsonOptions));
     }
 
@@ -113,27 +107,13 @@ public async Task ExecuteAsync(ExceptionHandlingContext ctx)
         }
 
         // Output the problem details
-#if NET7_0_OR_GREATER
         var problemDetailsContext = new ProblemDetailsContext
         {
             HttpContext = ctx.HttpContext,
-#if NET8_0_OR_GREATER
             Exception = ctx.Error,
-#endif
             ProblemDetails = problemDetails,
         };
         await _problemDetailsService.WriteAsync(problemDetailsContext);
-#else
-#pragma warning disable CS0618 // Type or member is obsolete
-        ctx.HttpContext.Response.ContentType = _options.ContentType;
-        await JsonSerializer.SerializeAsync(
-            ctx.HttpContext.Response.Body,
-            problemDetails,
-            _jsonSerializerOptions,
-            cancellationToken: ctx.HttpContext.RequestAborted
-        );
-#pragma warning restore CS0618 // Type or member is obsolete
-#endif
     }
 
     private string FormatName(string name)

diff --git a/src/ForEvolve.ExceptionMapper/Serialization/Json/ProblemDetailsSerializationOptions.cs b/src/ForEvolve.ExceptionMapper/Serialization/Json/ProblemDetailsSerializationOptions.cs
@@ -6,10 +6,4 @@ public class ProblemDetailsSerializationOptions
 {
     public bool SerializeExceptions { get; set; } = true;
     public Func<ExceptionHandlingContext, bool> DisplayDebugInformation { get; set; } = (ExceptionHandlingContext ctx) => false;
-#if NET6_0
-    private const string _obsoleteMessage = "This property was removed when targeting .NET 7+. The library now leverages the `IProblemDetailsService` interface instead.";
-
-    [Obsolete(_obsoleteMessage)]
-    public string ContentType { get; set; } = "application/problem+json; charset=utf-8";
-#endif
 }
diff --git a/test/ForEvolve.ExceptionMapper.Tests/ExceptionHandlerTest.cs b/test/ForEvolve.ExceptionMapper.Tests/ExceptionHandlerTest.cs
@@ -60,7 +60,7 @@ await sut.ExecuteAsync(new ExceptionHandlingContext(
 
             Assert.Equal(
                 sut.StatusCode,
-                _httpContextHelper.HttpResponse.StatusCode
+                _httpContextHelper.HttpResponseFake.StatusCode
             );
         }
 

diff --git a/test/ForEvolve.ExceptionMapper.Tests/ForEvolve.ExceptionMapper.Tests.csproj b/test/ForEvolve.ExceptionMapper.Tests/ForEvolve.ExceptionMapper.Tests.csproj
@@ -12,4 +12,19 @@
     <ProjectReference Include="..\..\src\ForEvolve.ExceptionMapper\ForEvolve.ExceptionMapper.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Update="coverlet.collector" Version="6.0.4">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Update="ForEvolve.Testing.AspNetCore" Version="1.0.20" />
+    <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Update="Moq" Version="4.20.72" />
+    <PackageReference Update="xunit" Version="2.9.3" />
+    <PackageReference Update="xunit.runner.visualstudio" Version="3.1.1">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
 </Project>
diff --git a/version.json b/version.json
@@ -1,6 +1,6 @@
 {
     "$schema": "https://raw.githubusercontent.com/AArnott/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
-    "version": "3.0",
+    "version": "4.0",
     "publicReleaseRefSpec": [
         "^refs/heads/master$"
     ],