SqlDependency不适用于LEFT JOIN

Question

我正在尝试将Signalr与sqldependency一起使用。我用：

进行了测试

select ACTION_DATE,Id,Type_ID,Customer_ID, Phone, Message, User_ID, 
Status_ID,CREATED_ON,Description from [TLS].[Notification] where user_id='" 
+ Parameters.UserID + "'" 

一切正常，当我在db中更改某些内容时，事件触发。

但是当我尝试使用Left join时，我的On_Change事件不会触发：

select c.DISPLAY_NAME as CustomerName, n.ACTION_DATE,n.Id,n.Type_ID,
n.Customer_ID, n.Phone,  n.Message, n.User_ID, 
n.Status_ID,n.CREATED_ON,n.Description 
from [TLS].[Notification] AS n Left outer join [TLS].[Customer]  AS c  
on c.ID=n.CUSTOMER_ID 
where user_id='" + Parameters.UserID + "' and n.STATUS_ID<>'3'

这是我的方法

 var messages = new List<SqlDataReader>();
        using (var connection = new SqlConnection(_dbContext.Database.Connection.ConnectionString))
        {
            connection.Open();
            using (var command = new SqlCommand(query, connection))
            {
                command.Notification = null;

                var dependency = new SqlDependency(command);
                var reader = command.ExecuteReader();
                dependency.OnChange += new OnChangeEventHandler(SqlNotification.dependency_OnChange);

                return _dbContext.Database.SqlQuery<T>(query);
            }
        }