C# 无法访问ASP.NET核心后台服务中已释放的对象

我试图弄清楚为什么我的数据库上下文会被下面的代码破坏。我试图在整个处理阶段更新记录的状态，但在尝试保存对htis实体的状态字段的更改时出现异常

在.SaveChanges（）或.FirstOrDefault（）调用上使用异步或非异步方法没有区别

这已注册为由IHostedService运行

IHostedService：

public class HostedDaemon : IHostedService
{
    private readonly ILogger<HostedDaemon> _logger;
    private Timer _queueTimer;
    private Timer _runTimer;
    private IServiceProvider Services { get; set; }

    public HostedDaemon(IServiceProvider services, ILogger<HostedDaemon> logger)
    {
        Services = services;
        _logger = logger;
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        var queueAutoEvent = new AutoResetEvent(false);
        _logger.LogInformation("HostedDaemon Starting");
        _queueTimer = new Timer(QueueJobs, queueAutoEvent, TimeSpan.Zero,
            TimeSpan.FromSeconds(900));
        _runTimer = new Timer(RunQueuedJobs, queueAutoEvent, TimeSpan.Zero,
            TimeSpan.FromSeconds(10));
        return Task.CompletedTask;
    }
    public Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("HostedDaemon Stopping");
        _queueTimer?.Change(Timeout.Infinite, 0);
        _runTimer?.Change(Timeout.Infinite, 0);
        return Task.CompletedTask;
    }
    public void Dispose()
    {
        _queueTimer?.Dispose();
        _runTimer?.Dispose();
    }

    private void QueueJobs(object stateInfo)
    {
        using (var scope = Services.CreateScope())
        {
            var autoEvent = (AutoResetEvent)stateInfo;
            var daemonProcessing = scope.ServiceProvider.GetRequiredService<IDaemonService>();
            //daemonProcessing.QueueJob();
            //daemonProcessing.RunJob();
            autoEvent.Set();
        }
    }
    private void RunQueuedJobs(object stateInfo)
    {
        using (var scope = Services.CreateScope())
        {
            var autoEvent = (AutoResetEvent)stateInfo;
            var daemonProcessing = scope.ServiceProvider.GetRequiredService<IDaemonService>();
            //daemonProcessing.QueueJob();
             daemonProcessing.RunJob(); 
            autoEvent.Set();
        }
    }
}

启动配置：

public void ConfigureServices(IServiceCollection services)
    {
        DynamicsAccountGuid = Configuration["Services:Dynamics:AccountGuid"];
        DynamicsCompany = Configuration["Services:Dynamics:Companies:Development"];
        DynamicsBasicAuth = Configuration["Services:Dynamics:BasicAuth"];
        ConnectionString = Configuration["ConnectionStrings:FIS_Local"];

        services.AddSingleton(Configuration);
        services.AddEntityFrameworkSqlServer()
            .AddDbContext<FisEntities>(options => options.UseSqlServer(ConnectionString));

        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddHttpClient<IRequestClient, DynamicsClient>("dynamics", d =>
        {
            d.BaseAddress = new Uri($"https://api.businesscentral.dynamics.com/v1.0/{DynamicsAccountGuid}/api/beta/companies/{DynamicsCompany}");
            d.DefaultRequestHeaders.Add("Authorization", DynamicsBasicAuth);
        });

        services.AddTransient<IQueueClient, CrmClient>();
        services.AddHostedService<HostedDaemon>();
        services.AddScoped<IDaemonService, TransactionService>();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    }

public void配置服务（IServiceCollection服务）
{
DynamicsAccountGuid=配置[“服务：动态：AccountGuid”]；
dynamiccompany=Configuration[“服务：动态：公司：开发”]；
DynamicsBasicAuth=配置[“服务：动态：BasicAuth”]；
ConnectionString=配置[“ConnectionString:FIS_Local”]；
services.AddSingleton（配置）；
services.AddEntityFrameworkSqlServer（）
.AddDbContext（options=>options.UseSqlServer（ConnectionString））；
配置（选项=>
{
//此lambda确定给定请求是否需要非必要cookie的用户同意。
options.checkApprovered=context=>true；
options.MinimumSameSitePolicy=SameSiteMode.None；
});
services.AddHttpClient（“dynamics”，d=>
{
d、 BaseAddress=新Uri（$”https://api.businesscentral.dynamics.com/v1.0/{DynamicsAccountGuid}/api/beta/companys/{DynamicsCompany}”）；
d、 DefaultRequestHeaders.Add（“授权”，dynamicBasicAuth）；
});
services.AddTransient（）；
services.AddHostedService（）；
services.addScope（）；
services.AddMvc（）.SetCompatibilityVersion（CompatibilityVersion.Version_2_2）；
}

在

HostedDaemon

类中的

RunQueuedJobs

方法中，替换

daemonProcessing.RunJob（）与
daemonProcessing.RunJob（）.Wait（）一起使用如下所示：

private void RunQueuedJobs(object stateInfo)
{
    using (var scope = Services.CreateScope())
    {
        var autoEvent = (AutoResetEvent)stateInfo;
        var daemonProcessing = scope.ServiceProvider.GetRequiredService<IDaemonService>();
        //daemonProcessing.QueueJob();
         daemonProcessing.RunJob().Wait(); // <-- Here it is
        autoEvent.Set();
    }
}

private void RunQueuedJobs（对象状态信息）
{
使用（var scope=Services.CreateScope（））
{
var autoEvent=（AutoResetEvent）stateInfo；
var daemonProcessing=scope.ServiceProvider.GetRequiredService（）；
//daemonProcessing.QueueJob（）；
daemonProcessing.RunJob（）.Wait（）；//获取异常时，请记住将实际的错误消息发布到问题中。从上面的内容来看，任何内容都不应处理上下文
我获取异常
-为什么不将异常消息添加到问题中？请将整个异常消息添加到问题中，并使用整个方法排除方法签名。您是否碰巧使用了Oracle的某个旧的/时髦的MySQL提供程序？@Gibbon这是一个通用对象处理异常，但我已经添加了其中的文本。@TanvirArjel添加了，但它是通用的
public void ConfigureServices(IServiceCollection services)
    {
        DynamicsAccountGuid = Configuration["Services:Dynamics:AccountGuid"];
        DynamicsCompany = Configuration["Services:Dynamics:Companies:Development"];
        DynamicsBasicAuth = Configuration["Services:Dynamics:BasicAuth"];
        ConnectionString = Configuration["ConnectionStrings:FIS_Local"];

        services.AddSingleton(Configuration);
        services.AddEntityFrameworkSqlServer()
            .AddDbContext<FisEntities>(options => options.UseSqlServer(ConnectionString));

        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddHttpClient<IRequestClient, DynamicsClient>("dynamics", d =>
        {
            d.BaseAddress = new Uri($"https://api.businesscentral.dynamics.com/v1.0/{DynamicsAccountGuid}/api/beta/companies/{DynamicsCompany}");
            d.DefaultRequestHeaders.Add("Authorization", DynamicsBasicAuth);
        });

        services.AddTransient<IQueueClient, CrmClient>();
        services.AddHostedService<HostedDaemon>();
        services.AddScoped<IDaemonService, TransactionService>();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    }

private void RunQueuedJobs(object stateInfo)
{
    using (var scope = Services.CreateScope())
    {
        var autoEvent = (AutoResetEvent)stateInfo;
        var daemonProcessing = scope.ServiceProvider.GetRequiredService<IDaemonService>();
        //daemonProcessing.QueueJob();
         daemonProcessing.RunJob().Wait(); // <-- Here it is
        autoEvent.Set();
    }
}