我试图将我的中间件管道配置为使用2个不同的异常处理程序来处理相同的异常.例如,我试图同时拥有我的自定义处理程序和内置的DeveloperExceptionPageMiddleware,如下所示:
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.ConfigureCustomExceptionHandler();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.ConfigureCustomExceptionHandler();
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseAuthentication();
app.UseMvcWithDefaultRoute();
}
我的目标是让自定义处理程序做自己的事情(记录,遥测等),然后将(next())传递给另一个显示页面的内置处理程序.我的自定义处理程序如下所示:
public static class ExceptionMiddlewareExtensions
{
public static void ConfigureCustomExceptionHandler(this IApplicationBuilder app)
{
app.UseExceptionHandler(appError =>
{
appError.Use(async (context, next) =>
{
var contextFeature = context.Features.Get<IExceptionHandlerFeature>();
if (contextFeature != null)
{
//log error / do custom stuff
await next();
}
});
});
}
}
我无法让CustomExceptionHandler将处理传递给下一个中间件.我得到以下页面:
404错误:
我尝试切换顺序,但是随后开发人员异常页面接管了并且不调用自定义异常处理程序.
我正在尝试做的事情有可能吗?
更新:
The solution was to take Simonare’s original suggestion and re-throw the exception in the
Invoke
method. I also had to remove any type of response-meddling by replacing the following inHandleExceptionAsync
method:
context.Response.ContentType = "application/json";
context.Response.StatusCode = (int)code;
return context.Response.WriteAsync(result);with:
return Task.CompletedTask;
最佳答案
您可以考虑在主目录/错误目录下添加日志记录,而不是调用两种不同的异常处理中间件
[AllowAnonymous]
public IActionResult Error()
{
//log your error here
return View(new ErrorViewModel
{ RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
}
或者,您可以使用自定义Expception Handling中间件
public class ErrorHandlingMiddleware
{
private readonly RequestDelegate _next;
public ErrorHandlingMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext context, IHostingEnvironment env)
{
try
{
await _next(context);
}
catch (Exception ex)
{
if (!context.Response.HasStarted)
await HandleExceptionAsync(context, ex, env);
throw;
}
}
private Task HandleExceptionAsync(HttpContext context, Exception exception, IHostingEnvironment env)
{
var code = HttpStatusCode.InternalServerError; // 500 if unexpected
var message = exception.Message;
switch (exception)
{
case NotImplementedException _:
code = HttpStatusCode.NotImplemented;
break;
//other custom exception types can be used here
case CustomApplicationException cae: //example
code = HttpStatusCode.BadRequest;
break;
}
Log.Write(code == HttpStatusCode.InternalServerError ? LogEventLevel.Error : LogEventLevel.Warning, exception, "Exception Occured. HttpStatusCode={0}", code);
context.Response.ContentType = "application/json";
context.Response.StatusCode = (int)code;
return Task.Completed;
}
}
并简单地在IApplicationBuilder方法中注册它
public void Configure(IApplicationBuilder app)
{
app.UseMiddleware<ErrorHandlingMiddleware>();
}
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