CODEWITHSUNDEEP
blazor-server-side
MRB
MRB

Reputation: 65

Globally available values in Blazor Server (and changing them during runtime)

In Blazor server the "appsettings.json" file is great for storing globally accessible variables. But what if these need changing during runtime? For example, lets say we have a stored value for "IsMaintenanceMode".

Given that;

  1. "IsMaintenanceMode" may need to be set to "True" during runtime (to then direct users to a maintenance page)

  2. If we were using a middleware to check this value for True (i.e. redirect the user to maintenance page) - then we would not want to look this variable up each time - eg from a database - on every request.

Traditionally this might have been accomplished using Application variables but I'm just not sure of the best approach with Blazor.

So my question is - what's the best way of storing this value in a way that can be "cached" for ease of lookup, but also easily changed during runtime?

Thanks for any advice.

Upvotes: 0

Views: 1137

Answers (1)

Bennyboy1973
Bennyboy1973

Reputation: 4236

StateServer.cs

public class StateServer {
    public bool IsMaintenanceMode {get; set;}
}

Add it in Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddSingleton<StateServer >();
}

Component.razor // Can be layout, main page, etc.

@inject StateServer _stateServer

@if (_stateServer.IsMaintenanceMode){
    <Warning />
}
else {
    <Body />
}

@code {
}

Or, you can check the value in one of the page lifecyle events, and navigate to whatever page you like.

Upvotes: 1

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