TL;DR This is because of the prerendering mechanism that initializes the component as a part of the host page _Host.cshtml, so that the first http request would result in a host page that comes not only as a script loader of the blazor application, but also with a statically rendered view. Therefore the user could … Read more
You probably don’t want to Invoke() the GetValue(), that would be rather pointless. You can implement the timer like this: System.Threading.Timer timer; protected override void OnInitialized() { timer = new System.Threading.Timer(async _ => // async void { Time = await GetValue(); // we need StateHasChanged() because this is an async void handler // we need … Read more
There are three possibilities for getting the user in a component (a page is a component): Inject IHttpContextAccessor and from it access HttpContext and then User; need to register IHttpContextAccessor in Startup.ConfigureServices, normally using AddHttpContextAccessor. Edit: according to the Microsoft docs you must not do this for security reasons. Inject an AuthenticationStateProvider property, call GetAuthenticationStateAsync … Read more
The following code snippets provide a way to retrieve the access token issued when a user is authenticated with IdentityServer4 provider. In order to get the access token you can use the HttpContext object, but since Blazor is SignalR-based, you’ll have to do it the only time the HttpContext object is available, when the connection … Read more
This is a classic problem, but slightly new in the context of Blazor. You need to make a copy of i because otherwise the lambda “captures the loop variable”. Capturing the copy is OK. @for (int i = 0; i < 3; i++) { int localCopy = i; <li> item @i <button onclick=@(() => clickItem(localCopy))>Click</button> … Read more
The fiction that the HttpContext object can’t be used with Blazor Server App, has been long propagated on Stackoverflow, and it is high time to pension it off. It is true that the HttpContext is not available when a WebSocket connection is in operation, but this must be clear: When you type an url and … Read more