exception 相关问题

我为最小的 API 创建了一个 GlobalExceptionHandler 和一些单元测试来验证处理程序。我的处理程序如下所示：内部类 GlobalExceptionHandler(ILoggerWrapper 我为最小的 API 创建了 GlobalExceptionHandler 和一些单元测试来验证处理程序。我的处理程序看起来像这样： internal class GlobalExceptionHandler(ILoggerWrapper<GlobalExceptionHandler> logger) : IExceptionHandler { /// <inheritdoc cref="IExceptionHandler.TryHandleAsync"/> public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception exception, CancellationToken cancellationToken) { ProblemDetails problemDetails = new() { Status = StatusCodes.Status500InternalServerError, //TODO: Build a visible endpoint to describe the exception CV-27246 Type = "https://httpstatuses.com/500", Detail = exception.StackTrace }; Action<Exception> logAction = logger.LogCritical; switch (exception) { case OperationCanceledException: problemDetails.Title = "The operation has been canceled."; break; case OutOfMemoryException: problemDetails.Title = "There was an error, Out of memory. Please see logs for more information."; break; case StackOverflowException: problemDetails.Title = "There was an error, StackOverflow. Please see logs for more information."; break; case SEHException: problemDetails.Title = "There was an error, SEHException. Please see logs for more information."; break; default: logAction = logger.LogError; problemDetails.Status = StatusCodes.Status417ExpectationFailed; //TODO: Build a visible endpoint to describe the exception CV-27246 problemDetails.Type = "https://httpstatuses.com/417"; problemDetails.Title = $"{exception.Message} Please see logs for more information."; break; } logAction(exception); httpContext.Response.StatusCode = problemDetails.Status.HasValue ? problemDetails.Status.Value : StatusCodes.Status500InternalServerError; httpContext.Response.ContentType = "application/json"; await httpContext.Response.WriteAsJsonAsync(problemDetails, cancellationToken); var canContinue = logAction != logger.LogCritical; return canContinue; } } 当抛出上述错误之一时，它正在工作并返回 false。在我的集成测试中我添加了： protected override void ConfigureWebHost(IWebHostBuilder builder) { builder.Configure(app => { app.UseExportService(); app.UseRouting(); app.UseEndpoints(endpoints => { endpoints.MapGet("throw-out-of-memory", UnhandledExceptionEndpoints.ThrowOutOfMemory); endpoints.MapGet("throw-stack-overflow", UnhandledExceptionEndpoints.ThrowStackOverflow); endpoints.MapGet("throw-seh", UnhandledExceptionEndpoints.ThrowSEHException); endpoints.MapGet("throw-handeled", UnhandledExceptionEndpoints.ThrowHandledException); }); }); } 这只是抛出所要求的异常。单元测试如下所示： [Fact] public async Task OperationCanceledException_ShouldReturn500() { //Arrange var client = _factory.CreateClient(); HttpResponseMessage? response = null; //Act response = await client.GetAsync("throw-out-of-memory"); var problemDetails = await response.Content.ReadFromJsonAsync<ProblemDetails>(); //Assert response.IsSuccessStatusCode.Should().BeFalse(); problemDetails.Status.Should().Be(500); problemDetails.Type.Should().Be("https://httpstatuses.com/500");//TODO: Build a visible endpoint to describe the exception CV-27246 problemDetails.Title.Should().Be("There was an error, Out of memory. please see logs for more information."); } 直到最近，所有这些都运行正常。它似乎在 CI/CD 上运行得很好，但是当我在本地运行它时，出现以下错误： System.Net.Http.HttpRequestException Error while copying content to a stream. at System.Net.Http.HttpContent.LoadIntoBufferAsyncCore(Task serializeToStreamTask, MemoryStream tempBuffer) at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken) at ExportService.Tests.Intergration.Middleware.GlobalExceptionHandlerTests.OperationCanceledException_ShouldReturn500() in C:\Users\james.tays\source\repos\Components\src\ExportService\ExportService.Tests.Intergration\Middleware\GlobalExceptionHandlerTests.cs:line 72 at Xunit.Sdk.TestInvoker`1.<>c__DisplayClass47_0.<<InvokeTestMethodAsync>b__1>d.MoveNext() in /_/src/xunit.execution/Sdk/Frameworks/Runners/TestInvoker.cs:line 259 --- End of stack trace from previous location --- at Xunit.Sdk.ExecutionTimer.AggregateAsync(Func`1 asyncAction) in /_/src/xunit.execution/Sdk/Frameworks/ExecutionTimer.cs:line 48 at Xunit.Sdk.ExceptionAggregator.RunAsync(Func`1 code) in /_/src/xunit.core/Sdk/ExceptionAggregator.cs:line 90 System.IO.IOException at Microsoft.AspNetCore.TestHost.ResponseBodyReaderStream.CheckAborted() at Microsoft.AspNetCore.TestHost.ResponseBodyReaderStream.ReadAsync(Memory`1 buffer, CancellationToken cancellationToken) at System.IO.Stream.<CopyToAsync>g__Core|27_0(Stream source, Stream destination, Int32 bufferSize, CancellationToken cancellationToken) at System.Net.Http.HttpContent.LoadIntoBufferAsyncCore(Task serializeToStreamTask, MemoryStream tempBuffer) System.OutOfMemoryException OutOfMemory at ExportService.Tests.Intergration.Endpoints.UnhandledExceptionEndpoints.ThrowOutOfMemory() in C:\Users\james.tays\source\repos\Components\src\ExportService\ExportService.Tests.Intergration\Endpoints\UnhandledExceptionEndpoints.cs:line 15 at lambda_method19(Closure, Object, HttpContext) at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.Invoke(HttpContext context) --- End of stack trace from previous location --- at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.HandleException(HttpContext context, ExceptionDispatchInfo edi) at Microsoft.AspNetCore.TestHost.HttpContextBuilder.<>c__DisplayClass23_0.<<SendAsync>g__RunRequestAsync|0>d.MoveNext() 在调试时我永远无法做到： var problemDetails = await response.Content.ReadFromJsonAsync<ProblemDetails>(); 您能解释一下为什么这个异常没有被处理吗？我刚刚在处理程序中返回 true，但它仍然具有相同的行为。在我的服务中，我确实有以下几点： services.AddProblemDetails(); services.AddExceptionHandler<GlobalExceptionHandler>(); 解决方案您对IExceptionHandler的实施不正确。 TryHandleAsync()方法的结果应该是一个布尔标志，指示是否应调用下一个异常处理程序并尝试处理异常，而不是请求管道是否可以根据错误严重性继续。所以，如果你回来： false - 这意味着您的异常处理程序没有处理异常。如果您只想记录一些有关异常的内容并且对处理它不感兴趣，这可能很有用。 true - 这意味着您的异常处理程序成功处理了异常，并且不需要进一步的异常。这就是为什么在此之后不会执行其他异常处理程序。另外：如果任何异常处理程序均未处理异常，则控制权将回退到中间件的默认行为和选项。 ~ ASP.NET Core 文档如果您写信给回复，则应始终返回true： await httpContext.Response.WriteAsJsonAsync(problemDetails, cancellationToken); return true; 这一切是如何发生的默认行为就是您的情况所发生的情况，尽管我必须承认我花了一段时间才揭开它的面纱。当你查看这段ExceptionHandlerMiddleware实现的源代码时（完整源代码位于GitHub）： string? handler = null; var handled = false; foreach (var exceptionHandler in _exceptionHandlers) { handled = await exceptionHandler.TryHandleAsync(context, edi.SourceException, context.RequestAborted); if (handled) { handler = exceptionHandler.GetType().FullName; break; } } 您可以看到这里的逻辑循环访问异常处理程序。但由于只注册了一个处理程序，而且是您自定义的处理程序，因此我们退出 for every 并将 handled 变量设置为 false。这允许满足下面的 if 语句并陷入其中： if (!handled) { if (_options.ExceptionHandler is not null) { await _options.ExceptionHandler!(context); } else { handled = await _problemDetailsService!.TryWriteAsync(new() { HttpContext = context, AdditionalMetadata = exceptionHandlerFeature.Endpoint?.Metadata, ProblemDetails = { Status = DefaultStatusCode }, Exception = edi.SourceException, }); if (handled) { handler = _problemDetailsService.GetType().FullName; } } } 选项中的异常处理程序为空，因此控制回退到默认行为并尝试将标准问题详细信息写入响应。但它未能这样做，因为此时响应已经写好了。您的自定义异常处理程序GlobalExceptionHandler已经设置了响应状态代码、响应标头并写入响应流。结果，引发了另一个异常： System.InvalidOperationException：无法修改响应标头，因为响应已经开始。但是，由于中间件抑制了次要异常（这样做是正确的！），我们又回到了最初的异常。而那个包裹在一些内部框架结构中的东西最终被抛出：

c# unit-testing asp.net-core exception

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exception stream clone winui-3 mediaplayerelement

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java exception cryptography struts javabeans

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我不断收到 Exception in thread "main" java.util.NoSuchElementException 错误消息。我已经尝试过更换东西，但我仍然遇到这个问题我尝试过声明变量...

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