Blazor webassembly signalr example

Copy. AspNetCore. The SignalR client then tries to connect to signalr. Add a new class that implements IUserIdProvider and retrieve one of the claims from the user to use as the identifier. Blazor WebAssembly helps developers build web applications without the need for JavaScript, plugins, or add-ons. . For example, consider a simple chat ApexCharts for Blazor. After downloading this NuGet package, we will need to add a reference to it into. Key property to specify the key for the service to inject: C#. com, and the user logs in and is issued with a secure HttpOnly authentication cookie. Hybrid apps encompass the following technologies: . BlazingChat is a Blazor WebAssembly app developed by CuriousDrive for the community. The "BlazorApp" profile is used when you run the Blazor app using the . Sep 28, 2021 · 1. . The Jiterpreter is a new runtime feature in . The official docs are here: Use ASP. The post also mentions the availability of the backend code in a GitHub repository for reference. But I am using SignalR first time ever. What I tried to do is to add a singleton to Main in program. Demonstration Feb 21, 2023 · Learn how to display live data from the database in Blazor using SqlTableDependency & SignalR. Say yes! Mar 9, 2023 · Download size is larger, and apps take longer to load. Select Blazor App. You will also see how to use Blazor startup to control when Blazor SignalR starts and stops. We will cover a v1 prototype version which streams log output from the moment a client Nov 15, 2023 · Before . com/b/LlKv(Affiliate Links)----- Feb 28, 2021 · Get Real-Time Updates in Blazor WebAssembly Apps with SignalR Communication. Device> devices = new List<DTO. HTTP/2 WebSockets use CONNECT requests rather than GET. I know how to get and use hubConnection in js, but not in blazor pages. More in the answer The following is a complete and working solution to the question: Create a Blazor Server App. NET Core app is configured to accept incoming connections for interactive components with MapRazorComponents in the Program file. One of the easiest way to enable SSO on a Blazor WebAssembly client is by adding the following NuGet package to the project: Microsoft. For more information about SignalR development, please check SignalR documentation. Apr 25, 2022 · SignalR is an excellent way to connect two or more clients together for real-time communication. Here’s how you can implement this in your application: 1. Blazor WebAssembly is a popular framework for building web applications using . Although some Blazor developers and online resources use the term "Blazor components," the documentation avoids that term and universally uses "Razor components" or "components. This package adds a Microsoft ASP. NET earlier than . NET process and render web UI to an embedded Web View control using a local interop channel. Chat with Registered Users. May 3, 2024 · Inject keyed services into components. Under Settings, set Service Mode to Dec 1, 2022 · This connection working fine in layout, but I don't understand how I get this connection to use on specific pages. Examples of user state held in browser May 28, 2024 · Razor is a syntax for combining HTML markup with C# code designed for developer productivity. 1 LTS status. Creating a Data Model. We have covered the following key concepts: Creating a new Blazor WebAssembly app; Adding SignalR to the project; Creating a SignalR hub; Creating a background service; Configuring SignalR Sep 17, 2021 · Images are sent by the server by means of SignalR as soon as they are acquired from the cameras (server-initiated communication). Oct 6, 2023 · SignalR uses the claim to determine the user name. Many of the components in the snippet sample apps compile and run if copied to a local test app. To do so, it implements a very simple site for creating and participating in surveys: Users can define surveys which are listed in the home page. Dec 12, 2020 · Blazor SignalR real time Notification System example. Blazor, akin to React, Angular, Vue, and Svelte, is a component-based web UI framework. NET Core Blazor apps. <p>@dev. Xamarin UI Kit Enhance the end-user experience with UI patterns. Data. Razor files use the . NET Core 3. razor. Oct 30, 2023 · Azure App Service. With Blazor, build web apps using reusable components that can be run from both the client and the server so that you can deliver great web experiences. Contains the code related to the Llama models. With the release of . My setup is: ASP. Blazor Web Apps in . NET Core server with SignalR and my Blazor WebAssembly by properly configuring 'MessagePack' Messaging is fully operational in both directions but I notice in the browser's network monitor that the websocket used by SignalR still sends its messages via JSON and Base64. razor ): C#. Server, perform the following steps: Add the nuget packages C1. NET Core support policy. Open up your terminal in VSCode and type the below: dotnetnewblazorwasm-oServerlessChat. Jun 18, 2024 · Client: Contains the Blazor WebAssembly user interface. NET 8 version of this article. Llama: This is a wrapper for LlamaSharp. Server 2 also hosts a Blazor Server project to provide the DbContext/API for a Blazor WebAssembly project intended to display the SQL data and real-time events. Creating Real-Time charts is one of the frequent requirements in Moden-Web Applications. For the location of the script, see ASP. For authorization code that runs on the server, authorization Oct 22, 2021 · Based on @ssamko's great answer, I created a service that provides an event to subscribe to when the connection state is changed, as well as a property that indicates whether there is a connection. NET Core application using SignalR. Tasks. Add a new folder named "Data" and add the SQLServerDataCollection. After the service is created, select Keys, and copy the Connection String (you will need it in the later steps). Scenario. LastDateTime</p>. NET Core projects that are unrelated to Blazor. ApexCharts is a free open-source JavaScript library to generate interactive and responsive charts. WebAssembly isn't used in Hybrid apps. Download project: https://zetbit. Virtualization. Consult the tutorial for further details. 1, but it doesn’t inherit the . Prior to the release of . {. Jun 27, 2024 · AWS Previews Deployment Tool for . Apr 11, 2024 · In a few documentation examples, JS interop is used to mutate an element purely for demonstration purposes as part of an example. Logs should be available from the Log streaming service and in logs on the file system of the App Service. Instead, the initial release of Blazor WebAssembly scheduled for May of this year will be a Current release, which “are supported for three months after a subsequent Current or LTS release” as described in the . cs file (add services. Notification Tone for new messages. The package aims to mimic the C# APIs of SignalR Client as much as possible and it is developed by wrapping the TypeScript client by using Blazor's interop capabilities. // other configurations omitted for brevity. This article explains how to configure Blazor apps, including app settings, authentication, and logging configuration. Feb 9, 2024 · The component folder structure of the . Aug 12, 2022 · Enabling SSO on Blazor client. Nov 9, 2020 · The extension methods class adds a couple of simple extension methods to the NavigationManager for accessing query string parameters in the URL. NET 8 or later) ( how to download ). Nov 28, 2022 · You can work in a local SignalR instance in a local development environment and work in Azure SignalR Service for Azure App Service at the same time without any code changes. User(conID). Id | @dev. BlazingChat has code samples for Authentication, Logging, Virtualization and much more. Jan 26, 2022 · Open Visual Studio 2022 Click on Create a New Project, choose a Blazor WebAssembly. First, define a model that represents the data you want to update in real-time. NET 8 that enables partial Just-in-Time (JIT) compilation support when running on WebAssembly to achieve improved runtime performance. Its distinctiveness lies in the use of C# for component This article explains how to use component virtualization in ASP. Events = new JwtBearerEvents. I’m personally excited about this release because it’s the first Blazor release that contains native support for client-side websockets! Previously, if you wanted to use websockets, you either had to write your own wrapper, or use a larger library like Feb 24, 2024 · In this article, we have explored how to send real-time notifications to specific users in a Blazor WebAssembly ASP. The BFF pattern is useful for making authenticated Blazor WebAssembly 5. The next step is to create a Razor page: We also need to handle the connection to the server and dealing with message exchanging: As you May 29, 2020 · Unfortunately SignalR attempts to authorize websocket requests by a query string parameter called access_token. Add this code to your startup: . You will get a message about adding missing dependencies for debugging in VSCode and VSCode wanting to resolve them. Use the InjectAttribute. 0 application that explores integrating SignalR with a Blazor WebAssembly application, as well as some of the latest C# features like record types. NET Core Hosted Model. js ), where the * placeholder is: server for a Blazor Server app. NET 8, Blazor supported two hosting models: Blazor Server, which runs your application on the server, and user UI interactions that occur in the browser are sent to the server via SignalR. " Feb 9, 2024 · This article explains Blazor hosting models, primarily focused on Blazor Server and Blazor WebAssembly apps in versions of . An ASP. Create a Blazor chat app: In Visual Studio, choose Create a new project. A web server capable of hosting an ASP. NET Core app. Feb 26, 2020 · I created default blazor server side app. However, I am having a problem with managing user connections. cs file from this previous post. Feb 9, 2024 · Offline support. Client library: Install-Package Microsoft. SendAsync("ReceiveItemMessage", ItemsCount); But the context is null, with a user or without, with a logged in user or unauthorized, it all doesn't seems to matter. NET Core APIs. The tutorial covers the frontend implementation, including forms, container components, and presentational components synchronized with SignalR. A Blazor Web App is integrated into ASP. Dispose! Mar 1, 2024 · For Blazor apps operating over a circuit, an unhandled exception thrown by rendering logic is fatal to the app's circuit. NET 7 introduced Websockets over HTTP/2 support for Kestrel, the SignalR JavaScript client, and SignalR with Blazor WebAssembly. NET Core Endpoint Routing. Real-Time Update Dashboard Layout using Syncfusion & SignalR. Step 2. The -o|--output option creates a folder for the project. My task is to update the list on demand from hub signalr. Add a new folder named "Hubs". MudBlazor Integrations – Super cool UI. Feb 6, 2024 · 1. - bjorg/BlazorWebSocket May 2, 2024 · Faster runtime performance with the Jiterpreter. To solve this issue we'll add a couple of Razor pages where the HttpContext is available. Reload to refresh your session. AddJwtBearer("Bearer", options =>. NET 8 or later are better conceptualized Jan 13, 2022 · In this article, we will implement the Real-Time Charts in Blazor WebAssembly Application using ASP. NET Core Blazor. This must be implemented using SignalR. It has a wide range of chart types. In this episode, David Pine joins Jeremy to show off this chat bot enabled demo that's powered by Blazor WASM and SignalR[00:00] - Start[01:09] - Why is Sign Feb 12, 2022 · SignalR, Blazor Server and State: Each browser window is a new connection User state created in a Blazor WebAssembly app is held in the browser's memory. Client -Version 3. Blazor and SignalR make a powerful combination for handling real-time data updates. In the component's OnInitializedAsync method , use HubConnectionBuilderExtensions. example. Using the same example as Server mode, the stock prices page would be downloaded to the client along with the various framework DLLs and WebAssembly runtime. The uniqueness of the problem is that each tab opened in a browser by a user represents an individual connection on the SignalR server. Mar 1, 2024 · The Blazor startup process is automatic and asynchronous via the Blazor script ( blazor. AddSignalR() and endpoints. Jun 1, 2020 · Yes, the SignalR client runs on . Blazor supports injecting keyed services using the [Inject] attribute. Show 3 more. Authentication. My first idea of how to achieve this is to send notification like this: public async System. To manually start Blazor: Blazor Web App: Add an autostart="false Jan 5, 2024 · Blazor: A Distinct Approach Amongst UI Frameworks. NET Core app is required. Timer) to set an analog clock. For example, to use the "Name" claim (which is the Windows username in the form [Domain]\[Username] ), create the following class: May 4, 2021 · The sample you provided in the question demonstrate add azure web app service principle in azure key vault and after deploying local project to azure, it can access vault secrets. ConfigureLogging to add the logging provider and set the minimum log level from configuration: Dec 5, 2023 · To create our Blazor app, we’ll use Visual Studio and create a template project. NET web framework using C#/Razor and HTML that runs in the browser with WebAssembly. You just clicked the "ASP. Amazon web services announced a developer preview to ease the process of deploying net web apps on the cloud platform which has become more complex with the advent of tech like docker and serverless joining the ever growing net ecosystem. NET Core SignalR with Blazor WebAssembly, they contain a complete example. 1. A Blazor WebAssembly (WASM) example using the Timer class to create and set an analog clock. You signed out in another tab or window. Apr 2, 2021 · In this Guide, we will be building a full-fledged Chat Application With Blazor WebAssembly using Identity and SignalR from scratch. In the following example, person. Then Choose Framework - . tech/Downloads/Project/5/displ Jan 28, 2020 · Blazor WebAssembly is currently based on . For more information, see Azure log streaming. If you do not already have a Azure SignalR Service, log into the Azure Portal, and select Create a resource and search for SignalR Service. ConnectionId; await Clients. websocket. If you look at the solution structure, we can see 3 different projects are created by default. This version of the article covers implementing OIDC without adopting the Backend for Frontend (BFF) pattern. dotnet new blazor -o TodoList. Dec 27, 2021 · So, the first thing we are going to do is to install the Microsoft. We are going to start with some introduction, differences between the Blazor server and Blazor WebAssembly (client), and their pros and cons. 0 Preview 1 was released (announcement). 2. Notification Popup for new messages. Deployment. Mar 5, 2023 · Blazor WebAssembly app that sends a POST/PUT request to the Web API. I have Blazor WebAssembly client app and ASPCore WebAPI with Microsoft Identity and I want to send notifications to specific users from server. We can create a web application with Visual Studio 2019 using the Blazor WebAssembly template. Download Source C Feb 8, 2023 · Step 3: Add Syncfusion Blazor Charts to the project. Blazor WebAssembly is a standards-based client-side web app platform, so it can use any browser API, including PWA APIs required for the following capabilities: Resources for Blazor, a . Jun 10, 2020 · The application running in Blazor Webassembly loads from app. You can easily set up a Hub in the server part. In this article, we will discuss how to persist an authenticated user's access token in a Blazor WebAssembly client app by using a SignalR endpoint in a custom AuthenticationStateProvider. NET 5. razor file extension. Screenshot of "Create new project" form in Visual Studio. Bold PDF Tools A free online tool to compress, convert, and edit PDFs. In Blazor Web Apps: See Configuration in ASP. Note that, unlike the WebAssembly App sample with SignalR, all the ClaimPrincipal object is available in the Hub, and you can access all its claims, as for instance: var user = Context. Feb 11, 2023 · I am working on a Blazor Server app over a SignalR connection with an ASP. NET Core Blazor WebAssembly. Then added Microsoft. In those cases, a warning appears in the text. NET Core Blazor project structure. Jun 5, 2020 · This blog post provides a step-by-step guide on how to create a Todo application using ASP. With its continued growth in popularity, getting started with Blazor now can open doors to new career paths and exciting projects – and Blazor WebAssembly by Example will make your first steps easier. For more information, see Call JavaScript functions from . NET Core hosted” option also. NET Core that enables real-time communication between web clients and servers. But it covers all the fundamentals. options. This article describes ASP. Address is null: Blazor: Timer Example - Analog Clock. NET Web Apps, Blazor WebAssembly -- Visual Studio Magazine. List<DTO. NET Core API to send real-time updates from the server to clients. NET SignalR. Server 1 pushes event data to Server 2 (via SignalR). Security scenarios differ between authorization code running server-side and client-side in Blazor apps. Improve the perceived performance of component rendering using the Blazor framework's built-in virtualization support with the Virtualize<TItem> component. SingalR. NET methods in ASP. May 21, 2024 · Blazor WebAssembly App: Persisting Access Token using SignalR Endpoint. Please select the “ASP. SignalR will help us sending messages back and forth between the client and the server, handling real-time updates. Any new survey added is notified to May 20, 2021 · The simplest way within a Blazor component would be to create a Timer, subscribe to Elapsed, and call InvokeAsync to update any state: AutoReset = true, Enabled = true, Interval = 60000, // 1 minute. Aug 13, 2020 · The launch settings file contains settings that are used when you run the example Blazor application on your local development machine. The main project must take into account other assets for ASP. cs. Watch the series. Feb 29, 2024 · Create Blazor WebAssembly App. Aug 12, 2022 · In the server project, SQLServerRealTimeUpdates. Create a form using the normal HTML <form> tag and specify an @onsubmit handler for handling the submitted form request. If you previously used [HttpGet("/path")] on your controller action method for Websocket requests, update it to use [Route("/path")] instead. Virtualization is a technique for limiting UI rendering to just the parts that are Dec 13, 2022 · Admittedly, this is a ridiculously simple example, but it does show you the power you have to create a communications channel between a BackgroundService and your Blazor App via SignalR. NET Blazor. When I got started with building a Chat Component for BlazorHero , I was not able to find many resources online that covered this specific requirement to the fullest. The default root component (first component loaded) is the App component ( App. This means that the chart must be generated without page postback. This will create a new Blazor WebAssembly project for you. A Blazor Progressive Web Application (PWA) is a single-page application (SPA) that uses modern browser APIs and capabilities to behave like a desktop app. Net Core hosted, then click Create. You can add user's userid (o Example . User. Standard HTML forms are supported. netstandard 2. Name | @dev. Using a server-side hosting model, Blazor is executed on the server from within an ASP. x , just what Blazor/Wasm needs. In this article, you will learn how to configure and manage Blazor SignalR connections, such as setting the transport type, logging level, and reconnect policy. This code is compatible with . Cascade Parameters. Name var userid = Context You signed in with another tab or window. For this project template, we will ensure that we place the project as a child directory of the solution. Then we are going to show you how to use components to Blazor Playground An online code editor for Blazor components. json. Threading. Components. Mar 11, 2021 · Now that the cookie is available in the Blazor App you can access it from the Chat page and pass it to the Hub. Razor components run natively in the . Documentation for ASP. Keys allow for scoping of registration and consumption of services when using dependency injection. In this series, we are going to learn about Blazor and how to create a powerful web application using Blazor WebAssembly. NET 8, snippet sample apps for Blazor Server and Blazor WebAssembly provide the code examples that appear in Blazor articles. Jan 23, 2024 · Before . Net 6. Searching for “Blazor”, we’ll find the Blazor WebAssembly Standalone App template. First, install the charts package: In the Solution Explorer window, right-click the BlazorSignalRChartApp project and select Manage NuGet Packages. NET Core CLI (dotnet run), and the "IIS Express" profile is used when you run the Blazor app from Visual Studio. 0 with ASP. Step-by-step instructions for building your first Blazor app. SignalR Integrations – Real-time Messaging with Hubs. NET 6 and . Asynchronous JavaScript calls Feb 16, 2024 · Create a new Blazor Web App named TodoList in a command shell: . It is the best free library that I found for working with real-time charts, with fluent animations. Server: Contains the server-side websocket/SignalR and REST/WebAPI logic for the application. In this scenario, Server 2 has to be both a SignalR client and server (for Blazor is a modern front-end web framework based on HTML, CSS, and C# that helps you build web apps faster. The best part is that this library is just a wrapper around Blazor WebAssembly Series. SqlClient and SqlTableDependency. Contribute to dotnet/AspNetCore. I get message from hub and view how call method BroadcastData and call func StateHasChanged, but on page dont updated this list. You switched accounts on another tab or window. Aug 19, 2021 · Now I want to change it to have the option to send to a specific user: string conID = Context. For more info see Blazor WebAssembly - Get Query String Parameters with Navigation Manager. A SaveChangesInterceptor reads the Feb 27, 2021 · The first thing we have to do is add the Microsoft. Hybrid apps use a blend of native and web technologies. You can set the model file location in this project in appsettings. As we are creating a Book app, add a “Book” class in the Apr 3, 2024 · Blazor SignalR is a feature of ASP. Client and ChatHub class. Create, use, and modify a simple counter component. To prevent a NullReferenceException in rendering logic, check for a null object before accessing its members. webassembly for a Blazor WebAssembly app. NET Core Hosted" checkbox in the project template, and an ASP. NET 8. Feb 9, 2024 · Blazor Hybrid. Jan 8, 2020 · This is only possible with HttpContext, which is not available in SignalR (Blazor Server App). NET Core 6 SignalR. NET 8, hosting server side controllers with a Blazor WebAssembly app was easy. Blazor WebAssembly (WASM), which runs your application compiled in WebAssembly entirely in the browser. NET Core SignalR client library for Microsoft ASP. Client. OnMessageReceived = context =>. Device>(); private HubConnection? hubConnection; Jun 20, 2024 · A project created from the Blazor project template includes the namespace by default in the app's _Imports. The app is open source and running in production. Then edited startup. 1, . Server 2 takes the event data and saves it to SQL. If you've created a folder for the project and the command shell is open in that folder, omit the -o|--output option and value to create the project. Click next, then setup your Project Name, then click next. The guidance in this article is relevant under all . css with this code : Aug 15, 2023 · This model is derived from the Blazor WebAssembly hosting model and fully capitalises on client-side capabilities, allowing C# code to run in the user’s browser. Have you tried to publish it to azure following the tutorial or you've just tested in your localhost? Apr 8, 2024 · In this article. Online | @dev. The client part of Signal-R is rather simple, but i don't want to create a separate site, since that ends in a CORS situation The only documentation i've been able to locate relates to Blazor Server, which i don A couple of days ago, Blazor WebAssembly 3. Of course, we only had a look at a very basic example. Aug 12, 2022 · This is all you need to do to secure the communication between a Blazor client and SignalR server. SignalR Blazor ExampleSource Code : https://payhip. A Blazor Hybrid app uses Blazor in a native client app. Develop with free tools for Linux, macOS, and Windows. *. Identity. May 28, 2024 · This article describes how to secure a Blazor Web App with OpenID Connect (OIDC) using a sample app in the dotnet/blazor-samples GitHub repository (. Enable the Application Logging (Filesystem) option in the Diagnostics logs section of the Azure App Service portal and configure the Level to Verbose. NET Core Web API (do the heavy lifting) Front end - Blazor App (server side - calling web api via Services classes i created in blazor project) Everything is working fine. Use the Blazor WebAssembly App project template to build your first Blazor WebAssembly application; Use templated components and the Razor class library to build a modal dialog box; Understand how to use JavaScript with Blazor WebAssembly; Build a progressive web app (PWA) to enable native app-like performance and speed Hey Coders,In this tutorial, I am showing how you can define the list of users who you want to be recipients in ASP. NET CLI. NET 8, a new template has been introduced called "Blazor Web App". Jan 20, 2024 · Implementing Real-Time Data Updates in Blazor Using SignalR. _jobTimer. This guidance applies to client-side project configuration in a Blazor Web App or a standalone Blazor WebAssembly app. Chats get stored to Database via EFCore. _Imports. Apr 10, 2022 · It is a Blazor WebAssembly & Blazor Server compatible approach using a custom NLog target and SignalR hub. Visual Studio includes a server-side app project template. DataCollection. Task SendPushNotification(ClaimsPrincipal user, string someNotificationMessage) Mar 1, 2024 · For the current release, see the . In other words in the server I'd have something like this. MapHub&lt;ChatHub&gt Dec 15, 2023 · My objective is to add (hopefully compressed) binary messaging between my ASP. This is a sample application for developers who are just getting started with Blazor. You can initially choose the Free tier. For more information, see Host and deploy ASP. SignalR. This repository contains a simple application that that connects to the `wss://echo. Versus Blazor Server: The Blazor Server hosting model offers several benefits: Download size is significantly smaller than a Blazor WebAssembly app, and the app loads much faster. 7. ApexCharts for Blazor is a wrapper library for working with ApexCharts in Blazor. License The trouble arises, when i try to integrate Signal-R in the same site, that delivers the pages i can't figure out, how to do that. NET Core. The Web API controller gets the SignalR connection ID (called "client ID" in my code) and includes it in a Mediatr request. Name the application and choose a folder. A template of Blazor Application has been created, you can run and see the I have created fairly complicated Blazor apps, calling web APIs, injecting services and using 3rd party libraries. NET releases for Blazor Hybrid apps that run on native mobile and desktop platforms. Click Create. Next, we are going to use the Syncfusion Blazor Charts component to create a real-time chart. Address properties aren't accessed if person. Client NuGet package. 5 days ago · WARNING: Always follow an article's security guidance when implementing sample code. WebAssembly. com, where the SignalRHub is hosted, but the negotiate step fails with a 401 Unauthorized. This May 26, 2020 · Create your Blazor WebAssembly project. 0 (Long Term Support), check on checkbox called ASP. NET Core project. After the installation, we are going to create two files in the main project in the Pages folder: SignalRCharts. Elapsed += JobMethod; // ^ don't forget to unsubscribe and dispose in IDisposable. NET 5, . Docs development by creating an account on GitHub. It runs as client-side Blazor WASM code. NET Core for guidance. Server, Microsoft. NET Core project was created for you, that would host the Blazor WebAssembly client. View. NET Core's support for the configuration and management of security in Blazor apps. Mar 1, 2024 · The following example is based on the demonstration in the SignalR with Blazor tutorial. Now, for modularity reasons I think the best approach would be to have a single Hub class and have like "multiple instances" of it. razor and SignalRCharts. UI updates, event handling, and JavaScript calls are handled over a SignalR connection. Here is an example that uses the timer ( System. org` to show how WebSocket connectivity works in Blazor WebAssembly. -The app takes full advantage of server capabilities, including the use of . A Mediatr pipeline behaviour takes this "client ID" and stores it in the HTTP context via the IHttpContextAccessor. Dec 25, 2021 · 1. Client project differs from the Blazor Web App's main project folder structure because the main project is a standard ASP. razor file, which makes the namespace available to the app's Razor components. hj lt ba ix ll tw au kw fx bc