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How do I detect a prerendering app in Blazor?

Platform: Blazor| Category: General

You can use the IHttpContextAccessor.HttpContext.Response.HasStarted property to check whether the application is pre-rendering or not.  HasStarted specifies that the response header has been sent to the client. If HasStarted is set to false, it means that the application is still pre-rendering and client connection is not yet established.

Refer to the following code sample.

@using Microsoft.AspNetCore.Http;
<button @onclick="@onClick"> Click </button>
@code {
    protected IHttpContextAccessor httpContextAccessor { get; set; }
    private void onClick()
        var isPreRendering = !this.httpContextAccessor.HttpContext.Response.HasStarted;

The HttpContextAccessor service should be registered by calling the AddHttpContextAccessor method in the Startup.cs.

public class Startup
    . . . . .
    public void ConfigureServices(IServiceCollection services)
    . . . . . 

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