Blazor session variable. Keeping state refe… Jan 17, 2022 · So in a .

Blazor session variable We use local storage for data that needs shared across multiple sessions. These values can be stored for the duration of the visitor's session on your site. Examples of how to manage state in Blazor WebAssembly and Blazor Server apps. or even custom objects. Dec 24, 2018 · In a server-side Blazor app I'd like to store some state that is retained between page navigation. This value can be of any data type: string, integer, boolean, etc. NET CORE MVC web application and I Jul 4, 2022 · What about state in Blazor? As we’ve already discussed in the article: “ How to start Blazor Project right ”, there are major architectural differences between Blazor Server and Client-side. razor and I want to pass the userChoice from index. Oct 20, 2022 · As blazor is stateful, there typically is no need for session variables. I need to have a persistent service per user, so I can't use a singleton. In this article, we will be exploring advanced and effective ways of state management in Blazor applications. It’s also reflected in the management of the application state. In this article, we will explore the usage of Session Storage in Blazor. 1). Blazor maintains a constant connection to the browser, called a circuit, that initiated the session Nov 3, 2025 · Server-side Blazor is a stateful application framework. [startup. If I have a variable from Index. SignalR apps can store per-connection state in Context. Lets say i have a Parent page that has a Login component : Login @functions() { Jul 7, 2020 · Is there a way to do the same thing (as in storing and calling) in Blazor? As far as I understand, blazor's server-side session alternative is stored for only one tab. I am very new to it. The only way I am able to get the values to persist is if I put the page's route and pass it through the parent controller. Blazor - Server Presentation. In Blazor there is no concept of a "per page" scope, registering a dependency as Scoped in Blazor will result in dependencies that live for the duration of the user's session. NET MVC, I handled the session_start event to load user details and store them in a session variable, so I didn't have to query the database with each page load. note: for blazor server uses signal/r for client/server communication, so there is just one standard request to open the connection and create the server state and thread tied to the connection. However, when we open another tab or browser window, going to the same URL, we noticed that the session persists. May 17, 2022 · 2 We are using a shared Razor Class Library for our Blazor applications containing all components, that both our Blazor Server and Blazor WebAssembly startup projects are using. It is scoped to the circuit, not global to the entire application. Apr 19, 2021 · To store local data, today's browsers support a local storage and a session storage. Blazor Server Example: Shows how static variables are shared and synchronized across all users connected to the same server. According to this documentation, session scope for a service in Blazor (server side) means: Scoped services aren't reconstructed when navigating among components on the Aug 31, 2024 · Working with Sessions and Cookies in ASP. NET Core server-side Blazor apps. cshtml. For this install the package and add the service to the application. Net webforms. This is with a view to using Blazor WASM so some may not make as much sense for Blazor Server. Apr 13, 2022 · App-specific configuration can be defined by nesting an environmentVariables element in the aspNetCore element. net mvc 3. Jun 20, 2024 · Learn about different ways to manage complex state in Blazor web applications, including via lifecycle method and by handling global state. If I'm Oct 28, 2019 · The best way to pass data between Blazor pages is by registering a singleton service and injecting it as a dependency onto the pages or components that need it. I'm trying to figure out how to do this in Blazor on . NET Core 3. I looked at all the various options in terms of cookies, local storage and session storage and it looks like the best fit would be the use of cookies with Javascript Jan 13, 2025 · Blazor applications can take advantage of browser APIs, such as local storage and session storage, to persist state directly in the browser. NET application. May 31, 2023 · In my Blazor server app I have a scoped service that should set lots a variables to their set values. On the server, a new circuit is created for each user session. NET Core app as environment variables. NET 5 for a new solution which requires use of session to eliminate round trips to the DB for the exact same data. timerCameras = new Timer(new TimerCallback(_ => Oct 27, 2023 · In a recent blog post I discussed Blazor 8 State Management, laying out a potential pitfall that Blazor app developers will encounter when using the new automatic render mode introduced in . ToString() + " - " + Session[s]; How can I loop through server and session variables in a Blazor server app running on an IIS server? Oct 13, 2023 · Summary Blazor scopes and the lifetime of services are fundamental concepts in Blazor that help manage the state, behavior, and resource allocation within your application. The difference between the two is that the session storage is only available per tab, and the stored data is deleted once you close the tab with the application. Sep 25, 2025 · Learn Blazor state management: component vs app state, DI containers, storage, and Redux‑style stores—complete with practical C# code. This repo shows how to manage application state in a . As said above, local storage is inefficient for blazor server projects. FOR EXAMPLE, in my file myfile. Each user session corresponds to rendering a single document in the browser. I have used localStorage and sessionStorage but users may view or temper the data stored in localStorage and sessionStorage Nov 11, 2025 · I have an existing webforms applications which logs the SessionId ,I am converting the entire appplication to blazor and was wondering if there was an equivalent of this session id?? I am somewhat new to blazor. The page is all time the same. SessionStorage Nuget package in the NuGet package manager to store the session data in Blazor. cs i catch the post of a form Ho do i write the session variables? and then how do i read ? public void… Jul 23, 2023 · Using Session- and LocalStorage in Blazor and MAUI How to use Session- or LocalStorage, what’s that and what can it do for you and your application. Net web forms project, I would simply use session variables to be able to set and get them across different pages. NET, you run foreach (string s in Request. Keys) s. SessionStorage nuget to do t Apr 1, 2022 · 8 How Can I Declare A Global Variables Model In BLAZOR WASM? Let's say I have the following model and I want to be able to access every variable from the model anywhere in my entire project (pages, services, components, anywhere). Get your free Azure account This project is intended to illustrate how to better manage state in Blazor applications. They use the same session id, but store values in different place. Keeping state refe… Jan 17, 2022 · So in a . When the user session ends with the browser tab being closed or the browser itself closed, the services are disposed of. Then just simple from every component: _memoryCache. public class PersonModel { public string FirstName { get; … Session storage is similar to local storage, but data in the session storage will be cleared after the session. It is based on the official documentation: ASP. com Aug 7, 2023 · Use sessionStorage and localStorage in Blazor Traditionally developers used cookies to store small pieces of information on the client machine. ⬇ Download the related presentation from here. Explore state management options, patterns, and best practices. Jun 17, 2021 · While working with blazor, I came across an issue. Can you help me, please ? Jul 3, 2024 · Learn how to write to and read from the local and session storage in a Blazor Server web application. Passing data throughout application I am new to Blazor and not too well versed on the in and outs of web development. SessionStorage package to store the session data in Blazor. I don't do a lot of work with Blazor, but I believe you're trying to approach Blazor as though it's an old ASP. That being said, one browser tab cannot access another browser tab's Session storage. Apr 19, 2023 · Blazor server: Stateful by default, with the "app like experience", state is maintained for the lifetime of the user session. Learn to enhance security and manage user sessions effectively, ensuring a robust application. May 29, 2023 · Radzen Blazor I am using Components Tools, and I want to maintain the value of the variable created in Load on a specific page without F5 (update) initialization, but I am wondering what to do about the corresponding method. razor) are defined as static because I want that these variables keep their values when the client navigates to other pages For state values I start with a local static class and use cross-session state persistence of either database, local storage (app or session scoped) in browser, or IndexedDB in browser, depending on my needs and what makes sense for a certain scenario. May 23, 2024 · Blazor wasm (and maui): Your static class or singleton is for the one user only and you are safe to use both Blazor Server (and SSR): Don't use static classes and singletons for keeping user related data. The environment variables load appropriately during that segment of app startup. Sep 30, 2022 · At my current project (blazor server side) I want to start using the session storage for user data like roles and names. How to access the Session storage in the browser? See full list on github. May 23, 2024 · Learn how to declare and use global variables in Blazor applications for seamless data sharing across different pages. Apr 29, 2020 · I am trying to use HttpContext. See these other repos for demos using the other two render modes: Application State (or app state) represents collectively all of the variables (objects, lists, etc. In a view using razor, I'd like to declare some local variables and use it across the entire page. Jul 19, 2022 · 1 I need to have a value available to all pages in my Blazor server side application (An AccountID). Session storage 🟨 Slightly different to Blazor Server Session storage is a convenient and efficient way to store a small amount of data on the client-side, which can be easily accessed and updated by a web application. Although you can use cookies in Blazor apps, there is a modern and more handy alternative -- sessionStorage and localStorage objects. NET 9 Blazor Web App using Interactive Server RenderMode. Params. get ("variable") You can use async _memoryCache as well, but don't forget to dispose Mar 19, 2024 · Hi @ David Thielen After testing the sample code, we can see that PersistentComponentState in Blazor is indeed tied to the SignalR circuit, meaning it persists across reconnects within the same session. Dec 19, 2019 · I am new to Blazor . May 7, 2023 · This is for Blazor (server). I am developing a web application in asp. ) that you Oct 1, 2023 · Hi all I asked here how to save variable state and i get long answers and what I want is to know if it's possible in blazor to define a variable somewhere in the app structure so I can access it from any component. For us, that's mainly just auth tokens. The variables that are set in the se Oct 20, 2022 · In ASP. set"variable") _memoryCache. A global variable is an object that can be accessed anywhere within your project. Params[s]; Session variables are obtained like this: foreach (string s in Session. Server. But I don't know how to pass the data from one page to another. To get started, fork the repo (optional) then clone it. This article guides you through creating session storage using Protected Session Storage in Blazor Server. ASP. Install the Blazored. I use Blazored. Asking how to create a session in Blazor seems to be akin to asking how to put gasoline in an all-electric car. Options. I know it is not best practice, but if your variables are just variables with small data and you don't need to pass some complex objects, just use IMemoryCache and use it like a session on the browser but stored on the backend. NET Core session state does not seem to be available as most likely Apr 24, 2025 · SignalR/Blazor Server and HTTP context-based state management SignalR apps shouldn't use session state and other state management approaches that rely upon a stable HTTP context to store information. Blazor. Unlike Component parameters, cascading values and parameters don't require an attribute assignment for each descendent component where May 19, 2022 · The suggested way to store the data would to store it locally on the browser or in the session storage (which apparently a lot of people say is a nightmare to work with ). SessionStorage and AspNetCore. Net Core 5 site and want to look up some values from the database when a user logs in and set them as session variables that I can access from any page. e. cs i catch the post of a form Ho do i write the session variables? and then how do i read ? public void… Dec 1, 2022 · Hello, i'm new to Blazor pages. If you have a default value, you can use the null coalesce operator to ensure there's always some value: Jul 24, 2024 · I thinks you could use "Server-side session storage" with "Client-side session storage" together. Jan 25, 2017 · The value of tenantSessionId will simply be null if the session variable is not set. Oct 14, 2024 · This post discusses how to solve issues with ProtectedSessionStorage in Blazor Server in . Cascading values and parameters provide a convenient way to flow data down a component hierarchy from an ancestor component to any number of descendent components. Use the Blazored. Some variables on a specific razor page (main. something like in console program… Jan 5, 2018 · Session state is a mechanism that enables you to store and retrieve user specific values temporarily. NET 8 (server) and I'm having trouble understanding a key concept. The values defined in this section are presented to the ASP. Jul 7, 2024 · 0 In ASP. 👀 Read the Jun 15, 2022 · In my experience, services are so easy to set up and use that I'd use them. NET Core provides powerful mechanisms for handling user … Feb 23, 2022 · Update variable in the layout from component - Blazor Asked 3 years, 8 months ago Modified 3 years, 8 months ago Viewed 3k times Learn how to enhance security in your Blazor Server applications by storing encrypted session data in the browser. Nov 11, 2025 · Learn about Blazor's event handling features, including event argument types, event callbacks, and managing default browser events. However I would like to have the user of the library be able to set some global (generic) object that all other components can access. ToString() + " - " + Request. NET Core 6, including problems with session data not being set and serialization errors. Jun 15, 2023 · Dive into the world of Blazor state management and uncover how to manage state locally, via a service, or using an application store with practical C# examples. AddMemoryCache () in startup file. NET Core Blazor state management. Basically I want to store some "session" information, a token, login time, list of permissions the user has, etc. net Core. How can I do it? Regular ASP. Mar 3, 2025 · Hi, I want to know about is there any method or technique available through which we can store our significant variables/maintain the page state in sessions under Blazor Server Pages? We are developing a high level blazor server application which needs… Jun 2, 2020 · new to Blazor I'm not sure to understand how user session is working. I have a service to Store a Customer like this : pu For example, if you set the key/value as 1 (number), the Session storage will automatically proceed to store the key/value as "1" (string). Besides, about the comparison between Jan 28, 2019 · Hello i am wondering how can you keep state of a component variable in Blazor without using different pages. I have injected service settings in my . In my example, I have a PersonModel class. . razor to my new razor page, how will I go about doing this? Test. Jun 11, 2021 · Learn how to persist data across multiple tabs and refreshes in Blazor Server applications with this Stack Overflow discussion. Jun 18, 2024 · I am currently learning Blazor in . Client - WASM This would also hold true when deploying the application since any environment variables set in the Azure App Service or other deployment environment wouldn't be accessible to the WASM part of the app. Currently I am using Blazor Server and am using a mixture of methods for passing data throughout the application. For example, if you set the key/value as 1 (number), the Session storage will automatically proceed to store the key/value as "1" (string). IOptions<Configuration> Configuration Next I have @code directive below Jul 13, 2024 · But this doesn't work because the Blazor application is split into two parts: Presentation. I am already using services. Items in the hub. Currently I wrote a service that will auth the user and populate a service with the data. Blazor webassembly: Same as Blazor server but on the client. How can I set a generic global state and accessing it in a blazor component Hey guys, I am working on a razor component library in which I would like to expose some components. razor page @inject Microsoft. I've tried Blazored. Apr 18, 2022 · I need to read user id and some more data from session which is crucial to get specific data from the server, check permissions and rendering the screen. This service can be executed from 8 different razor pages. , the hierarchy of component instances and their most recent render output) The values of any Session storage is similar to Local Storage but the data in the session storage will be cleared after the session. Dec 12, 2023 · Let's consider a simple blazor app (the standard template) in which i need to have some info about the user which is connected, like: SessionID IpAddress User Identity Name Usually, I retrieve this I've been looking for documentation but can't find anything about how to share and synchronize session in a blazor application that uses both Rendermode Server and Rendermode Auto. How can this be done? It Blazor WebAssembly Example: Demonstrates how static variables are handled in a client-side Blazor application, emphasizing isolation between different user sessions. Examples of state held for a user's circuit include: The UI being rendered (i. Dec 1, 2022 · Hello, i'm new to Blazor pages. I am passing variables to some child components, and the values are being lost when the page is refreshed. If you use singleton for anything other than global Jan 6, 2024 · This blog article shows you one of the ways to declare a global variable in ASP. NET Blazor. Blazor WebAssembly Example: Demonstrates how static variables are handled in a client-side Blazor application, emphasizing isolation between different user sessions. NET 8 or . A session is a browser tab. May 14, 2024 · Blazor WebAssembly is a variant of Blazor that runs in the browser and executes C# code using WebAssembly. What is Session storage? Set up the base code for interacting with Session storage. Aug 25, 2021 · We're using Blazor (Server Side) and . Each SignalR circuit will have its own instance of PersistentComponentState. It is a SPA, the page never refreshes, if refreshes then it means it is a new instance of the app (stop and restart app for the user) I just started learning how to make websites with using Blazor template. Jun 6, 2021 · Session storage is similar to the local storage but the data in the session storage will be cleared after the session. NET Core Managing user state is crucial for creating seamless and interactive user experiences. I cannot find how to use sessions in blazor project. SINGLETON will persist across sessions, including those of other users. Components. razor @code { int Nov 11, 2025 · This article explains how to flow data from an ancestor Razor component to descendent components. May 29, 2025 · When a browser session is established within an ASP. Extensions. Jul 12, 2022 · I have a Blazor server app. razor page, for example: Index. Managing state in Blazor, Microsoft's WebAssembly framework, is vital as apps grow. What is the proper way to do that in Blazor Web Assembly (with core hosti May 6, 2021 · 1 I'm building a Blazor Server . Collectively called Web Storage, these two objects allow you to store arbitrary pieces of information on the client This article will teach how to implement session storage in Blazor Server applications. For blazor server, we use injected services to store data that is specific to that session. cs] using Blazored. NET 8. I have spend the last 12 years developing . The thing that makes sense is a scope, from all the stuff I've read online… Sep 25, 2020 · How to add a security level to your variables with ProtectedSessionStorage or ProtectedLocalStorage in your Blazor Server app In Blazor Server we only have a server-client architecture so, It'll be the same server handling different connections, the scope of the static variables are global, so if you as a user open different tabs, they’ll share the same static variables and values, not per session/tab as expected. I am used to viewstate from web forms, and was hoping there is something like Aug 3, 2021 · Hi guys, I'm new to programming and was introduced to razor by a friend so I think this might be a very simple question to answer. razor @code { int userChoice = 5; } I made a new page called test. I'm trying to do a web site with Blazor Server Hosting (. Session storage 🟨 Slightly different to Blazor WebAssembly Session storage is a convenient and efficient way to store a small amount of data on the client-side, which can be easily accessed and updated by a web application. It is a bit different than . First Create a sample application to test the below steps along with me. Most of the time, your users will maintain an ongoing connection to the server, and their state will be held in the server's memory in what's known as a "circuit". Nov 17, 2020 · The Article will give you details on how to maintain session state in a Blazor app to the closest thing to traditional server-side sessions. For example, multiple tabs create multiple sessions. The Session storage isolates data by session. Session in my ASP. Expand your skills and contribute to the conversation today. NET Core and client-side storage mechanisms. We're currently using the recommended Nov 6, 2018 · That is the tutorial that I followed till now but couldn't access session variable from other razor pages except the one I saved that variable in. By understanding these concepts and choosing the right service lifetime for each scenario, you can build efficient and maintainable Blazor applications. Explore techniques to safeguard sensitive user information using ASP. Apr 11, 2022 · In the background, there's an autorefresh function running, which should continously refresh my session variables within an endless- timer - loop: Globals. How to access the Session storage in the browser? Oct 14, 2024 · Learn how to effectively persist global objects, such as a CUSTOMER object, across multiple pages and components in your Blazor app. Obviously any page variable or global variable is reset/lost on page refresh. Nov 11, 2025 · During server-side rendering, Blazor Web Apps can persist a user's session (circuit) state when the connection to the server is lost for an extended period of time or proactively paused, as long as a full-page refresh isn't triggered. Sep 15, 2022 · I am using Blazor WebAssembly and I want to store user data in the session. According to this documentation, session scope for a service in Blazor (server side) means: Scoped services aren't reconstructed when navigating among components on the client, where the communication to the server takes… Dec 15, 2023 · Session variables rely on a key-value pair system, where the 'key' is the unique identifier for the 'value' stored. NET Core Blazor Server application, this creates a user session, or circuit, where created services are in a scoped or transient lifetime. Nov 9, 2020 · An important tool to have when developing web applications are global variables that keep state. If you're using server side, be careful which option you use for scope: SCOPED will allow you to pass data among pages, but not if a new session is started (for example by hitting Refresh). I can't start while (true) loops from inside components or they will run forever I suggest adding some component lifetime variables, or events, such as: OnComponentClose (); OnComponentIna May 19, 2022 · What means 'Page refreshes' for you? In Blazor that does not a sense. NET Core Blazor Server application (as described in this MS Doc, I mean: all correctly set up in startup) Here is the code part when I try to set a Jan 24, 2025 · Dotnet Blazor Session Storage using Redis (part 1) When building web applications, they often consist of multiple pages, and users may navigate between them frequently. Mainly session storage and route parameters. Nov 11, 2025 · This article explains how to manage memory use in deployed ASP. hyrvpl lxnl nclkwc ymjof wbdnq gigzkg uemo nfjhs zemzaa crsyl jkhn uurzq gcmwrl pbvck kybr