新建一个asp.net core 3.0的项目不能返回JsonResult。.NET Core SDK版本 3.0.100-preview6-012264

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


public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
    }

    app.UseStaticFiles();

    app.UseRouting();

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllerRoute(
            name: "default",
            pattern: "{controller=Home}/{action=Index}/{id?}");
    });
}

public IActionResult Index()
{
    return Json(new { name = "tom" });
}

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asp.net core 3.0不能返回JsonResult?

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