我在Visual Studio 2017社区中使用.Net Framework 4.6.1,Microsoft.AspNet.WebAPI 5.2.4.
我的APIController的实现端点会抛出预期的异常,例如,如果不满足某些要求.我添加了全局ExceptionFilterattribute和ExceptionHandler来处理这些异常并返回正确的响应.
异常是一种继承System.Exception的类型.
这只是偶尔按预期工作.每隔一秒或三分之一或有时第五(没有实际模式)请求API服务器根本不返回任何响应,例如例如Postman说:“无法得到任何回应”.
为了测试这个,我使用了具有相同输入的相同端点.
以下是我为了更好地了解问题所做的一些事情:
我向Global.asax添加了异常日志记录(以捕获First Chance Exceptions)
我订阅了Global.asax Application_Error事件
我查看了IIS日志
没有人让我更接近这个问题.异常被捕获并记录在Global.asax中,就像预期的那样,但是没有其他错误或异常可以为我的问题提供更多信息.
这是我的代码:
我简化了APIController的功能并删除了业务逻辑.
[Route("test")][httpGet]public IhttpActionResult Gettest(){ throw new ObjectAlreadyExistsException("test"); return ResponseFactory.CreateOkResponse(null);}public class ExceptionFilter : ExceptionFilterattribute{ public overrIDe voID OnException(httpActionExecutedContext context) { if (context.Exception is ObjectAlreadyExistsException) { context.Response = ResponseFactory.CreateErrorResponseMessage(context.Exception.Message,new Error("OBJECT_ALREADY_EXISTS_ERROR",context.Exception.Message)); } else if (context.Exception is ObjectNotFoundException) { context.Response = ResponseFactory.CreateErrorResponseMessage(context.Exception.Message,new Error("OBJECT_NOT_FOUND_ERROR",context.Exception.Message)); } base.OnException(context); }}public class GlobalExceptionHandler : ExceptionHandler{ private static Readonly ILogger Log = new LoggerConfiguration() .Writeto.file(new CompactJsonFormatter(),Path.Combine(@PropertIEs.Settings.Default.LOG_DIRECTORY,@"error.Json"),rollOnfileSizelimit: true,retainedfileCountlimit: 5,shared: true) .Enrich.WithWebAPIControllername() .Enrich.WithWebAPIActionname() .Enrich.WithWebAPIRouteTemplate() .Enrich.WithWebAPIRouteData() .Enrich.With(new AuthTokenEnricher()) .CreateLogger(); public overrIDe voID Handle(ExceptionHandlerContext context) { if (context != null && context.Exception != null) { Log.Error("Unexpected Internal Server Error {Exception}",context.Exception); } context.Result = ResponseFactory.CreateErrorResponse(httpStatusCode.InternalServerError,"Unexpected Internal Server Error",new Error("INTERNAL_SERVER_ERROR","This request Failed because of an unexpected server error.")); }}public static class WebAPIConfig{ public static voID Register(httpConfiguration config) { //Exception filters config.Filters.Add(new ExceptionFilter()); config.Services.Replace(typeof(IExceptionHandler),new GlobalExceptionHandler()); // Web API routes config.MaphttpAttributeRoutes(); }}public class ObjectAlreadyExistsException : Exception{ public ObjectAlreadyExistsException(string message) : base(message) { } public ObjectAlreadyExistsException(string message,Exception inner) : base(message,inner) { }}
现在我提出了一个解决方法,看起来像这样:
[Route("test")][httpGet]public IhttpActionResult Gettest(){ try { throw new ObjectAlreadyExistsException("test"); } catch (Exception ex) { return CustomExceptionHandler.Handle(ex); }}public class CustomExceptionHandler{ private static Readonly ILogger Log = new LoggerConfiguration() .Writeto.file(new CompactJsonFormatter(),shared: true) .Enrich.WithWebAPIControllername() .Enrich.WithWebAPIActionname() .Enrich.WithWebAPIRouteTemplate() .Enrich.WithWebAPIRouteData() .Enrich.With(new AuthTokenEnricher()) .CreateLogger(); public static IhttpActionResult Handle(Exception ex) { IhttpActionResult result = null; if (ex != null) { if (ex is ObjectAlreadyExistsException) { result = ResponseFactory.CreateErrorResponse(ex.Message,ex.Message)); } else if (ex is ObjectNotFoundException) { result = ResponseFactory.CreateErrorResponse(ex.Message,ex.Message)); } } if (result == null) { if (ex != null) { Log.Error("Unexpected Internal Server Error {Exception}",ex); } result = ResponseFactory.CreateErrorResponse(httpStatusCode.InternalServerError,"This request Failed because of an unexpected server error.")); } return result; }}
我将不胜感激任何想法如何调试此或任何建议来解决它.
解决方法 你可以尝试从IhttpActionResult继承并使用它作为从GlobalExceptionHandler返回异常private class ErrorMessageResult : IhttpActionResult { private Readonly httpResponseMessage _httpResponseMessage; private httpRequestMessage _request; public ErrorMessageResult(httpRequestMessage request,httpResponseMessage httpResponseMessage) { _request = request; _httpResponseMessage = httpResponseMessage; } public Task<httpResponseMessage> ExecuteAsync(CancellationToken cancellationToken) { return Task.Fromresult(_httpResponseMessage); } }
并称之为,
public overrIDe voID Handle(ExceptionHandlerContext context){ var result = new httpResponseMessage(httpStatusCode.InternalServerError) { Content = new StringContent("Internal Server Error Occurred"),ReasonPhrase = "Exception" }; context.Result = new ErrorMessageResult(context.Request,result);}
来自GlobalExceptionHandler:ExceptionHandler
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