C#SqlDependency-对象名无效

https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/detecting-changes-with-sqldependency ).

我正在通过Sql Server管理员帐户与SSPI连接。我确信该对象是service broker队列,并且它是存在的。

void Initialization()  
{  
    // Create a dependency connection.  
    SqlDependency.Start(connectionString, queueName);  
}  

void SomeMethod()  
{  
    // Assume connection is an open SqlConnection.  

    // Create a new SqlCommand object.  
    using (SqlCommand command=new SqlCommand(  
        "SELECT ShipperID, CompanyName, Phone FROM dbo.Shippers",   
        connection))  
    {  

        // Create a dependency and associate it with the SqlCommand.  
        SqlDependency dependency=new SqlDependency(command);  
        // Maintain the refence in a class member.  

        // Subscribe to the SqlDependency event.  
        dependency.OnChange+=new  
           OnChangeEventHandler(OnDependencyChange);  

        // Execute the command.  
        using (SqlDataReader reader = command.ExecuteReader())  
        {  
            // Process the DataReader.  
        }  
    }  
}  

// Handler method  
void OnDependencyChange(object sender,   
   SqlNotificationEventArgs e )  
{  
  // Handle the event (for example, invalidate this cache entry).  
}  

void Termination()  
{  
    // Release the dependency.  
    SqlDependency.Stop(connectionString, queueName);  
}