我在Web应用程序Blazor服务器端工作。我得到错误时，应用会话超时达到20分钟，然后应用程序将重定向到登录页面。
此代码块发生错误

services.AddSession(options =>
        {
            options.IdleTimeout = TimeSpan.FromMinutes(20);
        });
    services.AddScoped<ISession>(_ => _.GetRequiredService<IHttpContextAccessor>().HttpContext.Session);

误差

Category: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost
EventId: 111
SpanId: b5f359c71bdf98dd
TraceId: 55c402b51115a74fe957d0762f8e004f
ParentId: 0000000000000000
RequestId: 800002a3-0000-f500-b63f-84710c7967bb
RequestPath: /_blazor
TransportConnectionId: GD0qeN4kpoisoFqdq7Lm_Q

Unhandled exception in circuit 'fsJjR_i80e4-G8BcnIas7mkmnqTlTY5vpTXVNEzo_Rg'.

Exception: 
System.NullReferenceException: Object reference not set to an instance of an object.
   at UC.AppRepository.UI.Startup.<>c.<ConfigureServices>b__4_1(IServiceProvider _) in D:\test repository\BackupBlazor\UC.AppRepository.UI\Startup.cs:line 67
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass2_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.AspNetCore.Components.ComponentFactory.<>c__DisplayClass7_0.<CreateInitializer>g__Initialize|1(IServiceProvider serviceProvider, IComponent component)
   at Microsoft.AspNetCore.Components.ComponentFactory.PerformPropertyInjection(IServiceProvider serviceProvider, IComponent instance)
   at Microsoft.AspNetCore.Components.ComponentFactory.InstantiateComponent(IServiceProvider serviceProvider, Type componentType)
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.InstantiateChildComponentOnFrame(RenderTreeFrame& frame, Int32 parentComponentId)
   at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewComponentFrame(DiffContext& diffContext, Int32 frameIndex)
   at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewSubtree(DiffContext& diffContext, Int32 frameIndex)
   at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InsertNewFrame(DiffContext& diffContext, Int32 newFrameIndex)
   at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
   at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, Int32 componentId, ArrayRange`1 oldTree, ArrayRange`1 newTree)
   at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()

详细信息
我在20分钟后应用会话超时
1 -在wwwroot/js文件上创建具有checkSessionTimeout功能的js

function checkSessionTimeout(currentUrl) {
    var sessionTimeout = 20 * 60 * 1000; // 2 minutes in milliseconds
    var lastActivity = new Date(Date.parse(sessionStorage.getItem("LastActivity"))); // get the last activity time from the client-side session
  
    if (new Date() - lastActivity > sessionTimeout) {
        /*console.log("reach 2 minutes")*/
        

sessionStorage.clear(); // clear the session storage

} 
else 
{
    setTimeout(function () { checkSessionTimeout(currentUrl); }, 1000); // check again in 1 second
    }
    
    }

checkSessionTimeout（window.document. writeln）;
第2页。剃刀

@inject ISession Session;
protected override void OnInitialized()
{
DateTime now = DateTime.Now;
string nowString = now.ToString("yyyy-MM-ddTHH:mm:ss");
JS.InvokeVoidAsync("sessionStorage.setItem", "LastActivity", now);

}

3 -组件加载后调用函数checkSessionTimeout

protected override async Task OnAfterRenderAsync(bool firstRender)
{

var lastActivity = Session.GetInt32("LastActivity");

if ( TimeSpan.FromTicks(DateTime.Now.Ticks - lastActivity.Value) < TimeSpan.FromMinutes(20))
{
    navigationManager.NavigateTo("/Login/Login");
    return;
}
}

4-on _host文件在正文的最后一行添加以下内容：

<script src="~/assets/js/checksessiontimeout.js"></script>

5-启动类

public void ConfigureServices(IServiceCollection services)
        {
            
    services.AddHttpContextAccessor();
    services.AddHttpClient();
    services.AddRazorPages();
    services.AddServerSideBlazor();
    services.AddSession();
    services.AddSession(options =>
    {
        options.IdleTimeout = TimeSpan.FromMinutes(20);
    });
services.AddScoped<ISession>(_ => _.GetRequiredService<IHttpContextAccessor>().HttpContext.Session); line 67 that give me error 
}

那么如何解决或防止这种错误的发生呢？

更新文章

那么您能告诉我如何在不使用HTTP上下文情况下实现会话超时吗？
你能用代码告诉我吗
如果我避免使用HTTP上下文，那么有什么解决方案来实现它