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Question

Simplified Startup code:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseMvc(routes =>
    {
        routes.MapRoute(
        name: "default",
        template: "",
        defaults: new { controller = "Main", action = "Index" });
    });
}

After running application in Visual Studio 2015 I see in browser "localhost:xxx", but I don't see result of MainController.Index(). Just blank page. What did I miss?

Update:

Web.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false"/>
  </system.webServer>
</configuration>

Update 2:

The problem comes from exception in dependency injected service to controller and because I forget to use developer exception page site just returned blank page to me. So I'm sorry for incorrect question, but routing is fine in my case.

Answer 1

routes.MapRoute(
    name: "default",
    template: "{controller}/{action}/{id?}",
    defaults: new { controller = "Main", action = "Index" });

routes.MapRoute(
    name: "default",
    template: "{controller=Main}/{action=Index}/{id?}");

These are the two ways of defining default route. You are mixing them. You need always to define a template. In the second way you can write the defaults directly in the template.

Answer 2

The easiest way for me (and without using MVC) was to set the controller to default route using empty [Route("")] custum attribute like so:

[ApiController]
[Route("")]
[Route("[controller]")]
public class MainController : ControllerBase
{ ... }

with Startup.Configure

app.UseRouting();
app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
});

Answer 3

Another solution would be to redirect "/" to another url

 app.UseEndpoints(endpoints =>
        {
            endpoints.MapDefaultControllerRoute();

            endpoints.MapGet("/", context =>
            {
                return Task.Run(() => context.Response.Redirect("/Account/Login"));
            });
        });

Answer 4

For all of you who get blank page set PreserveCompilationContext to true:

  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
    <PreserveCompilationContext>true</PreserveCompilationContext>
  </PropertyGroup>

in csproj in vs 2017 or

"buildOptions": {   "preserveCompilationContext": true }

in project.json

Answer 5

In Startup.cs class, use a convenient Method: UseMvcWithDefaultRoute() :

public void Configure(IApplicationBuilder app, IHostingEnvironment 
{
   app.UseMvcWithDefaultRoute();
}

Can be used to change:

public void Configure(IApplicationBuilder app, IHostingEnvironment 
{
   app.UseMvc(routes =>
   {
      routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
   });
}

More info in Microsoft documentation

Answer 6

For anyone stumbling over this and wanting to serve static default content (single page app hosted in kestrel or whatever) there is also an extension method MapFallbackToFile that can be used like this in Program.cs or Startup.cs

app.UseEndpoints(
  endpoints =>
  {
    endpoints.MapControllers();  // not needed for this sample
    endpoints.MapFallbackToFile("index.html");
  });

app is an IApplicationBuilder that you should already have somewhere in your startup code.