Question

我有一个基本路由的非常基本的asp.net MVC 6应用程序，我有一个自定义的ErrorController来将错误路由到某些视图。

但我希望当用户键入不存在的URL时，会抛出异常（我可以处理它）。但是，当我输入一些随机URL时，不会抛出任何异常，我只是得到一个空白页面。我非常确定这在MVC＆lt; MVC＆lt; 6。

如果我只是在控制器中抛出异常，错误处理本身就可以正常工作。

Startup.cs（部分）

public void Configure(IApplicationEnvironment appEnv, IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseBrowserLink();
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler(HandleException);
    }
    app.UseStaticFiles();
    app.UseMvc(routes => MapRoutes(routes, appEnv));
}


private static void MapRoutes(IRouteBuilder routes, IApplicationEnvironment env)
{
    routes.MapRoute(
       name: "default",
       template: "{controller}/{action}/{id?}",
       defaults: new { controller = "main", action = "index" });          
}

private static void HandleException(IApplicationBuilder errorApp)
{
    #pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
    errorApp.Run(async context => HandleErrorContext(context));
    #pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously
}

private static void HandleErrorContext(HttpContext context)
{
    var error = context.Features.Get<IExceptionHandlerFeature>();
    var exception = error.Error;
    if (exception == null)
    {
        context.Response.Redirect("../error/external");
    }
    else if (exception is ExpirationException)
    {
        context.Response.Redirect("../error/expired");
    }
    else if (exception is HttpException)
    {
        var httpException = exception as HttpException;
        int code = httpException.GetHttpCode();
        context.Response.Redirect("../error/external?code=" + code);
    }
    else
    {
        context.Response.Redirect("../error/external");
    }
}

Answer 1

不能直接回答我的问题，但我已经从https://stackoverflow.com/a/4833519/2713516开始工作了。我仍然想知道为什么asp.net不会抛出404.

           routes.MapRoute(
                "PageNotFound",
                "{*catchall}",
                new { controller = "Home", action = "PageNotFound" }
                );

Answer 2

您可以通过将 StatusCodePages 中间件添加到管道来显示用户友好的错误页面。 In Startup.cs

public void Configure(IApplicationEnvironment appEnv, IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseBrowserLink();
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/error/500");
        app.UseStatusCodePagesWithReExecute("/error/{0}");
    }
    app.UseStaticFiles();
    app.UseMvc(routes => MapRoutes(routes, appEnv));
}

应该通过重新执行路径/error/{0}生成响应正文。

[Route("[controller]")]
public class ErrorController : Controller
{            
     [HttpGet("{statusCode}")]
     public IActionResult Error(int statusCode)
     {     
           //switch (statusCode)
           //{  
           //    return different views...
           //}

           Response.StatusCode = statusCode;
           return View("Error", statusCode);
     }
}

如何显示404错误页面或任何其他错误页面。

对于未定义的路由，MVC 6没有异常抛出

2 个答案: