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This article mainly shows you "how to use ExceptionFilter filter in asp.net", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use ExceptionFilter filter in asp.net" this article.

Brief introduction

An exception filter, as its name implies, is the filter used when an exception occurs in a program. Used for handling when an uncaught exception occurs in the system.

Implement a custom exception filter

Customizing a global exception filter requires implementing the IExceptionFilter interface

Public class HttpGlobalExceptionFilter: IExceptionFilter {public void OnException (ExceptionContext context) {throw new NotImplementedException ();}}

The IExceptionFilter interface requires the implementation of the OnException method, which is triggered when an uncaught exception occurs in the system. The OnException method has an ExceptionContext exception context that contains specific exception information, HttpContext and mvc routing information. Once there is an uncaptured exception in the system, it is more common to use the logging tool to record the details of the exception to facilitate correction and debugging. The following is the implementation of logging.

/ Global exception filter / public class HttpGlobalExceptionFilter: IExceptionFilter {readonly ILoggerFactory _ loggerFactory; readonly IHostingEnvironment _ env; public HttpGlobalExceptionFilter (ILoggerFactory loggerFactory, IHostingEnvironment env) {_ loggerFactory = loggerFactory; _ env = env;} public void OnException (ExceptionContext context) {var logger = _ loggerFactory.CreateLogger (context.Exception.TargetSite.ReflectedType) Logger.LogError (new EventId (context.Exception.HResult), context.Exception, context.Exception.Message); var json = new ErrorResponse ("unknown error, please try again"); if (_ env.IsDevelopment ()) json.DeveloperMessage = context.Exception; context.Result = new ApplicationErrorResult (json); context.HttpContext.Response.StatusCode = (int) HttpStatusCode.InternalServerError; context.ExceptionHandled = true } public class ApplicationErrorResult: ObjectResult {public ApplicationErrorResult (object value): base (value) {StatusCode = (int) HttpStatusCode.InternalServerError;}} public class ErrorResponse {public ErrorResponse (string msg) {Message = msg;} public string Message {get; set;} public object DeveloperMessage {get; set;}

Register a global filter

Now that the filter has been written, you need to register in asp.net core MVC. Find the system root Startup.cs file, and modify the ConfigureServices method as follows

Services.AddMvc (options = > {options.Filters.Add ();})

test

Throw an exception in the request

Abnormal information was correctly captured in the log.

The browser returns a 500 error and a custom error message.

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