app.UseMvcWithDefaultRoute();

    public static IApplicationBuilder UseMvcWithDefaultRoute(this IApplicationBuilder app)
    {
      if (app == null)
        throw new ArgumentNullException("app");
      return app.UseMvc((Action<IRouteBuilder>) (routes => routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}")));
    }

 [Route("[controller]/[action]")]

namespace Core1RtmEmptyTest.Controllers
{
  public class HomeController
  {
   public string Index()
   {
    return "Running a POCO controller!";
   }
  }
}

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

using Microsoft.AspNetCore.Mvc;
 
namespace Core1RtmEmptyTest.Controllers
{
  public class AboutController : Controller
  {
   public ActionResult Hello()
   {
    return Content("Hello from DNT!");
   }
 
   public ActionResult SiteName()
   {
    return Content("DNT");
   }
  }
}

using Microsoft.AspNetCore.Mvc;
 
namespace Core1RtmEmptyTest.Controllers
{
  [Route("About")]
  public class AboutController : Controller
  {
   [Route("")]
   public ActionResult Hello()
   {
    return Content("Hello from DNT!");
   }
 
   [Route("SiteName")]
   public ActionResult SiteName()
   {
    return Content("DNT");
   }
  }
}

 AmbiguousActionException: Multiple actions matched. The following actions matched route data and had all constraints satisfied:

Core1RtmEmptyTest.Controllers.AboutController.Hello (Core1RtmEmptyTest)
Core1RtmEmptyTest.Controllers.AboutController.SiteName (Core1RtmEmptyTest)

using Microsoft.AspNetCore.Mvc;
 
namespace Core1RtmEmptyTest.Controllers
{
  [Route("[controller]")]
  public class AboutController : Controller
  {
   [Route("")]
   public ActionResult Hello()
   {
    return Content("Hello from DNT!");
   }
 
   [Route("[action]")]
   public ActionResult SiteName()
   {
    return Content("DNT");
   }
  }
}

 [Route("api/[controller]")]

//[Route("/Users/{userid}")]
[Route("Users/{userid}")]
public IActionResult GetUsers(int userId)
{
    return Json(new { userId = userId });
}

[Route("/Users/{userid:int?}")]

 [Route("Users/{userid:int}")]

 [Route("/Users/{userid:int:max(1000):min(10)}")]

 [Route("/Users/{userid:int}", Name="GetUserById")]

 string uri = Url.Link("GetUserById", new { userid = 1 });

 [Route("/Users/{userid:int}", Name = "GetUserById", Order = 1)]

using System;
using System.Globalization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;
 
namespace Core1RtmEmptyTest
{
  public class CustomRouteConstraint : IRouteConstraint
  {
   public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values,
    RouteDirection routeDirection)
   {
    object value;
    if (!values.TryGetValue(routeKey, out value) || value == null)
    {
      return false;
    }
 
    long longValue;
    if (value is long)
    {
      longValue = (long)value;
      return longValue != 10;
    }
 
    var valueString = Convert.ToString(value, CultureInfo.InvariantCulture);
    if (long.TryParse(valueString, NumberStyles.Integer,
      CultureInfo.InvariantCulture, out longValue))
    {
      return longValue != 10;
    }
    return false;
   }
  }
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddRouting(options =>options.ConstraintMap.Add("Custom", typeof(CustomRouteConstraint)));

 [Route("/Users/{userid:int:custom}")]

app.UseMvc(routes =>
{
  routes.MapRoute(
   name: "default",
   template: "{controller=Home}/{action=Index}/{id?}");
 
  routes.MapRoute(
   name: "spa-fallback",
   template: "{*url}",
   defaults: new { controller = "Home", action = "Index" });
});

{
    "dependencies": {
       //same as before  
       "Microsoft.AspNetCore.SpaServices": "1.0.0-beta-000007"
 },

app.UseMvc(routes =>
{
  routes.MapRoute(
   name: "default",
   template: "{controller=Home}/{action=Index}/{id?}");
 
  routes.MapSpaFallbackRoute("spa-fallback", new { controller = "Home", action = "Index" });
});

// Serve wwwroot as root
app.UseFileServer();
 
// Serve /node_modules as a separate root (for packages that use other npm modules client side)
app.UseFileServer(new FileServerOptions
{
  // Set root of file server
  FileProvider = new PhysicalFileProvider(Path.Combine(Directory.GetCurrentDirectory(), "node_modules")),
  // Only react to requests that match this path
  RequestPath = "/node_modules",
  // Don't expose file system
  EnableDirectoryBrowsing = false
});

• ASP.NET AJAX در آینده نیز کاملا پشتیبانی می‌شود، اما شهروند درجه یک محسوب نخواهد شد؛ مانند استفاده از ScriptManager و UpdatePanel

• Ajax Control Toolkit که اکنون به صورت سورس باز در سایت CodePlex نیز قابل دریافت است، منسوخ شده در نظر گرفته شده و تنها در آینده شاید هر از چندگاهی به رفع باگ‌های گزارش شده در آن پرداخته شود (اما دیگر به صورت فعال توسعه داده نخواهد شد).

• Microsoft Ajax Library / ASP.NET Ajax Library هر چند تشابه اسمی با ASP.NET Ajax دارند اما جزئی از کتابخانه‌ی AJAX Control Toolkit بوده و این مورد نیز از این پس منسوخ شده در نظر گرفته خواهد شد (مانند استفاده از DataView یا Sys.require ).

@page "/BlazorJS"

<h3>BlazorJS</h3>

@code
{
}

<li class="nav-item px-3">
    <NavLink class="nav-link" href="BlazorJS">
        <span class="oi oi-list-rich" aria-hidden="true"></span> BlazorJS
    </NavLink>
</li>

@page "/BlazorJS"

@inject IJSRuntime JsRuntime

<h3>BlazorJS</h3>

<div class="row">
    <button class="btn btn-secondary" @onclick="TestConfirmBox">Test Confirm Button</button>
</div>
<div class="row">
    @if (ConfirmResult)
    {
        <p>Confirmation has been made!</p>
    }
    else
    {
        <p>Confirmation Pending!</p>
    }
</div>

@code {
    string ConfirmMessage = "Are you sure you want to click?";
    bool ConfirmResult;

    async Task TestConfirmBox()
    {
        ConfirmResult = await JsRuntime.InvokeAsync<bool>("confirm", ConfirmMessage);
    }
}

dotnet tool install -g Microsoft.Web.LibraryManager.Cli
libman init
libman install bootstrap --provider unpkg --destination wwwroot/lib/bootstrap
libman install jquery --provider unpkg --destination wwwroot/lib/jquery
libman install toastr --provider unpkg --destination wwwroot/lib/toastr

<head>
    <base href="~/" />
    <link rel="stylesheet" href="lib/toastr/build/toastr.min.css" />

</head>
<body>
 
    <script src="lib/jquery/dist/jquery.min.js"></script>
    <script src="lib/toastr/build/toastr.min.js"></script>
    <script src="_framework/blazor.server.js"></script>
</body>

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <Target Name="DebugEnsureLibManEnv" BeforeTargets="BeforeBuild" Condition=" '$(Configuration)' == 'Debug' ">
    <!-- Ensure libman is installed -->
    <Exec Command="libman --version" ContinueOnError="true">
      <Output TaskParameter="ExitCode" PropertyName="ErrorCode" />
    </Exec>
    <Error Condition="'$(ErrorCode)' != '0'" Text="libman is required to build and run this project. To continue, please run `dotnet tool install -g Microsoft.Web.LibraryManager.Cli`, and then restart your command prompt or IDE." />
    <Message Importance="high" Text="Restoring dependencies using 'libman'. This may take several minutes..." />
    <Exec WorkingDirectory="$(MSBuildProjectDirectory)" Command="libman restore" />
  </Target>
</Project>

window.ShowToastr = (type, message) => {
  // Toastr don't work with Bootstrap 4.2
  toastr.options.toastClass = "toastr"; // https://github.com/CodeSeven/toastr/issues/599

  if (type === "success") {
    toastr.success(message, "Operation Successful", { timeOut: 20000 });
  }
  if (type === "error") {
    toastr.error(message, "Operation Failed", { timeOut: 20000 });
  }
};

    <script src="lib/jquery/dist/jquery.min.js"></script>
    <script src="lib/toastr/build/toastr.min.js"></script>
    <script src="js/common.js"></script>
    <script src="_framework/blazor.server.js"></script>
</body>

@page "/BlazorJS"

@inject IJSRuntime JsRuntime


<div class="row">
    <button class="btn btn-success" @onclick="@(()=>TestSuccess("Success Message"))">Test Toastr Success</button>
    <button class="btn btn-danger" @onclick="@(()=>TestFailure("Error Message"))">Test Toastr Failure</button>
</div>

@code {
    async Task TestSuccess(string message)
    {
        await JsRuntime.InvokeVoidAsync("ShowToastr", "success", message);
    }

    async Task TestFailure(string message)
    {
        await JsRuntime.InvokeVoidAsync("ShowToastr", "error", message);
    }
}

using System.Threading.Tasks;
using Microsoft.JSInterop;

namespace BlazorServerSample.Utils
{
    public static class JSRuntimeExtensions
    {
        public static ValueTask ToastrSuccess(this IJSRuntime JSRuntime, string message)
        {
            return JSRuntime.InvokeVoidAsync("ShowToastr", "success", message);
        }

        public static ValueTask ToastrError(this IJSRuntime JSRuntime, string message)
        {
            return JSRuntime.InvokeVoidAsync("ShowToastr", "error", message);
        }
    }
}

@using BlazorServerSample.Utils

async Task TestSuccess(string message)
{
   //await JsRuntime.InvokeVoidAsync("ShowToastr", "success", message);
   await JsRuntime.ToastrSuccess(message);
}

@inject IJSRuntime JsRuntime


@code {
    // ...

    public async Task TestSuccess(string message)
    {
        await JsRuntime.ToastrSuccess(message);
    }
}

@page "/ParentComponent"

<ChildComponent
    OnClickBtnMethod="ShowMessage"
    @ref="ChildComp"
    Title="This title is passed as a parameter from the Parent Component">
    <ChildContent>
        A `Render Fragment` from the parent!
    </ChildContent>
    <DangerChildContent>
        A danger content from the parent!
    </DangerChildContent>
</ChildComponent>

<div class="row">
    <button class="btn btn-success" @onclick="@(()=>ChildComp.TestSuccess("Done!"))">Show Alert</button>
</div>


@code {
    ChildComponent ChildComp;
    // ...
}

Clean up some .NET Clutter 

Semantic highlighting in OmniSharp and C# extension for VS Code 

"csharp.semanticHighlighting.enabled": true,
"editor.semanticHighlighting.enabled": true

Decompilation support in OmniSharp and C# Extension for VS Code 

{
  "RoslynExtensionsOptions": {
   "enableDecompilationSupport": true
  }
}

.NET 5 preview support in OmniSharp and C# Extension for VS Code 

An In Depth Tutorial on Linux Development on Windows with WSL and Visual Studio Code