如何在返回null时检索HttpContext属性？

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpContextAccessor();
}

public class MyClass
{
    private readonly IHttpContextAccessor _httpContextAccessor;

    public MyClass(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public void MyMethod()
    {
        var httpContext = _httpContextAccessor.HttpContext;
        if (httpContext != null)
        {
            // 检索HttpContext属性
        }
    }
}

public class AsyncLocalHttpContext
{
    public static readonly AsyncLocal<HttpContext> Current = new AsyncLocal<HttpContext>();
}

public class HttpContextMiddleware
{
    private readonly RequestDelegate _next;

    public HttpContextMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext httpContext)
    {
        AsyncLocalHttpContext.Current.Value = httpContext;
        await _next(httpContext);
    }
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.UseMiddleware<HttpContextMiddleware>();
}

public class MyClass
{
    public void MyMethod()
    {
        var httpContext = AsyncLocalHttpContext.Current.Value;
        if (httpContext != null)
        {
            // 检索HttpContext属性
        }
    }
}