asp.net core MVC 全局過濾器之ExceptionFilter過濾器(1)

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

 /// <summary>
 /// 全局異常過濾器
 /// </summary>
 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("未知錯誤,請重試");

 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; }
 }

 services.AddMvc(options =>
 {
 options.Filters.Add<HttpGlobalExceptionFilter>();
 });