.net core web api 控制器和动作选择

Question

I need to generate appropriate 404 erors according to:

1. If requesting controller doesn't exist;
2. If action doesn't exist;

I'm trying to migrate web api on .NET Core Web API and need to find analog in .net core of DefaultHttpControllerSelector and ApiControllerActionSelector , which was in .net framework. Because I have modules, which checks controller and action existance. And generate custom error if controller or action haven't found. How I can handle this?

Answer 1

For controller or action not exist, it will return 404 by default.

If you want to custom the Error Message, you could try Middleware to check the Response.StatusCode and then custom the reponse based on your own logic.

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseDatabaseErrorPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }
        app.Use(async (context, next) => {
            //handle request
            await next.Invoke();
            //handle response
            if (context.Response.StatusCode == StatusCodes.Status404NotFound)
            {
                //hanlde based on your logic
                await context.Response.WriteAsync("Something wrong");
            }
        });
  // Rest app.Use