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如何清理SQL Server以清除过期的SqlDependency对象？从SqlDepedency对象收到事件后,我需要创建一个新事件才能获得新事件.但是,SQL Server进程的内存使用量会增加,直到超出允许的内存(SQL Server Express).如何摆脱旧查询？

码:

// Func: RegisterTableListener
using (SqlConnection cn = new SqlConnection(Properties.Settings.Default.DatabseEventConnectionString))
{
if (cmd == null)
{
    cmd = cn.CreateCommand();

    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "SELECT HostName, LastStatus, LastDetails, xml FROM dbo.[SystemTable]";
}

lock (cmd)
{
    cmd.Connection = cn;
    cn.Open();
    cmd.Notification = null;

    //  creates a new dependency for the SqlCommand
    if (dep == null)
        dep = new SqlDependency(cmd);
    //  creates an event handler for the notification of data
    //      changes in …