C# SQL依赖于基于连接数的更改事件触发

我刚刚尝试过实现sql依赖关系来检测表中的更改，就实现而言，我在更改表中的数据时就得到了触发器，但问题是我得到的触发器是基于连接数的。 例如，如果我的url在两个浏览器中打开，那么当表中有更改时，依赖更改事件会触发两次，如果它打开三次，那么依赖更改事件会触发三次，并且很快就会触发

这是我试过的代码

        private void GetUsers()
        {   
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand command = connection.CreateCommand())
                {
                    command.CommandType = CommandType.Text;
                    command.CommandText = "SELECT FirstName, LastName FROM dbo.[Users]";

                    command.Notification = null;

                    //  creates a new dependency for the SqlCommand
                    SqlDependency dependency = new SqlDependency(command);
                    //  creates an event handler for the notification of data
                    //      changes in the database.
                    //  NOTE: the following code uses the normal .Net capitalization methods, though
                    //      the forum software seems to change it to lowercase letters
                    dependency.OnChange += new OnChangeEventHandler(Dependency_OnChange);

                    connection.Open();

                    List<UserInfo> userList = new List<UserInfo>();
                    using (IDataReader userDataReader = command.ExecuteReader())
                    {
                        if (userDataReader != null)
                        {
                            while (userDataReader.Read())
                            {
                                UserInfo userInfo = new UserInfo();
                                userInfo.FirstName = Convert.IsDBNull(userDataReader["FirstName"]) ? string.Empty : Convert.ToString(userDataReader["FirstName"]);
                                userInfo.LastName = Convert.IsDBNull(userDataReader["LastName"]) ? string.Empty : Convert.ToString(userDataReader["LastName"]);
                                userList.Add(userInfo);
                            }
                        }
                    }

                    if (userList != null && userList.Count > 0)
                    {
                        this.dgUserList.DataSource = userList;
                        this.dgUserList.DataBind();
                    }
                }
            }
        }

private void Dependency_OnChange(object sender, SqlNotificationEventArgs e)
        {
            this.GetUsers();

            // this will remove the event handler since the dependency is only for a single notification
            SqlDependency dependency = sender as SqlDependency;

            //  NOTE: the following code uses the normal .Net capitalization methods, though
            //      the forum software seems to change it to lowercase letters
            dependency.OnChange -= new OnChangeEventHandler(Dependency_OnChange);


            // To broadcast my message
            ChatHub chat = new ChatHub();
            chat.send("myname", "New Registration Done");
        }

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任何帮助都将不胜感激。

您希望看到的行为是什么？您的问题不清楚。我需要只触发一次依赖项更改事件，每次我更改tableFYI中的数据时，依赖项更改事件触发器的次数会随着页面刷新而增加。例如，如果我刷新页面两次，那么事件将触发两次，以此类推……是否每次加载页面时都调用GetUsers方法？如果是这样，这就是在每次调用该方法时向数据库注册一个通知。如果您只希望收到一次通知，则需要注意通知已注册，并作出相应的反应。但这是我的页面加载保护的无效页面\u Loadobject发件人，EventArgs e{If！this.IsPostBack{this.GetUsers；}