如何将httpcontext传递给asyn轮询函数中的子线程

Question

我已经经历过类似的关于httpContext.Current的查询在异步方法中变为null。

根据这篇文章 - ＆gt; HttpContext.Current is null in an asynchronous Callback，HttpContext在异步函数（子线程）中不可用。

我已经在我的函数中实现了异步轮询，我的被调用函数使用了httpContext对象，该对象变为null。有人可以告诉我如何将HttpContext传递给子线程。

delegate DataSet MethodDelegate(SqlParameter[] paramFilterScreenCreate);

public DataSet Call()
   {
     dtFilter= ExecutePolling(paramFilterScreenCreate);
   }

public DataSet LongRunningMethod( SqlParameter[] paramFilterScreenCreate)
   {

     DataSet dtFilter = new DataSet();

    //call a stored procedure and connection string(Session Manager class - session.cs)
     dtFilter = SqlHelper.ExecuteDataset(Utility.GetConnectionString(Constants.ASSET_MANAGEMENT), StoreProcedures.ROD_SCREEN_FILTER_EXECUTE, paramFilterScreenCreate);
                        return dtFilter;
}

public DataSet ExecutePolling(SqlParameter[] paramFilterScreenCreate)
  {
     MethodDelegate dlgt = LongRunningMethod;

    // Initiate the asynchronous call.
     IAsyncResult ar = dlgt.BeginInvoke(paramFilterScreenCreate, null, null);

    // Poll IAsyncResult.IsCompleted
     while (ar.IsCompleted == false)
       {
          Thread.Sleep(1000);  
       }
     DataSet result = dlgt.EndInvoke(ar);

     return result;

  }




 Class Session
{
 /// <returns>Returns of the value of the sessoin for the specified key</returns>
        public static T Get<T>(string key)
        {
            object objectToReturn = null;
            objectToReturn = HttpContext.Current.Session[key] ;//HttpContext goes null here

            return objectToReturn == null ? default(T) : (T)objectToReturn;
        }
}