Question

默认情况下，信号器集线器在每个页面加载时启动，并在同一页面刷新或c＃中的新选项卡上的同一浏览器上创建新的连接ID。

我很抱歉它不是信号器问题，但在我的情况下，但我需要如何更新信号灯。

signalr在每个页面刷新时创建新的连接ID并保留以前的连接ID。当任何更新接收时，它会向每个新连接发送更新

但我希望每个标签一个浏览器有一个连接，它不应该在刷新或新选项卡上为同一个浏览器创建新的连接ID。

我使用的代码：

JobHub.cs上课

public class JobHub : Hub
 {
    public static void Show()
       {
        IHubContext context =   GlobalHost.ConnectionManager.GetHubContext<JobHub>();
        context.Clients.All.displayStatus();
       }
  }

View.cshtml

 <script src="~/Scripts/jquery-1.10.2.min.js"></script>
 <script src="~/Scripts/jquery.signalR-2.2.1.min.js"></script>
 <script src="~/signalr/hubs" type="text/javascript"></script>
 <script type="text/javascript">
 var job = $.connection.jobHub;
 job.client.displayStatus = function () {
            alert("change notice");
            getData();
        };

 $.connection.hub.start().done(function () {
            //connection started
            alert("connection started");
            getData();
        });

 function getData() {
        var $tbl = $('#tblJobInfo');
        $.ajax({
            url: 'http://localhost:51737/api/values',
            type: 'GET',
            datatype: 'json',
            success: function (data) {
                if (data.length > 0) {
                    $tbl.empty();
                    $tbl.append(' <tr><th>ID</th><th>Name</th><th>Last Executed Date</th><th>Status</th></tr>');
                    var rows = [];
                    for (var i = 0; i < data.length; i++) {
                        rows.push(' <tr><td>' + data[i].JobID + '</td><td>' + data[i].Name + '</td><td>' + data[i].LastExecutionDate.toString().substr(0,10) + '</td><td>' + data[i].Status + '</td></tr>');
                    }
                    $tbl.append(rows.join(''));
                }
            }
        });
    }

Div

 <div>
 <table id="tblJobInfo" style="text-align:center;margin-left:10px"> </table></div>

JobInfo.cs和JobInfoRepository.cs

public class JobInfo
{
    public int JobID { get; set; }
    public string Name { get; set; }
    public DateTime LastExecutionDate { get; set; }
    public string Status { get; set; }
}
public class JobInfoRepository
{

    public IEnumerable<JobInfo> GetData()
    {

        using (var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString))
        {
            connection.Open();
            using (SqlCommand command = new SqlCommand(@"SELECT [JobID],[Name],[LastExecutionDate],[Status]
           FROM [dbo].[JobInfo]", connection))
            {
                // Make sure the command object does not already have
                // a notification object associated with it.
                command.Notification = null;

                SqlDependency dependency = new SqlDependency(command);
                dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);

                if (connection.State == System.Data.ConnectionState.Closed)
                    connection.Open();

                using (var reader = command.ExecuteReader())
                    return reader.Cast<IDataRecord>()
                        .Select(x => new JobInfo()
                        {
                            JobID = x.GetInt32(0),
                            Name = x.GetString(1),
                            LastExecutionDate = x.GetDateTime(2),
                            Status = x.GetString(3)
                        }).ToList();



            }
        }
    }
    private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
    {

        //calling hub notification
        JobHub.Show();

    }
}

API ValuesController.cs
```
public class ValuesController : ApiController
{
 JobInfoRepository objRepo = new JobInfoRepository();

 // GET api/values
 public IEnumerable<JobInfo> Get()
 {
    return objRepo.GetData();
 }
}
```
每当我通过DB获取更新时刷新页面，它会多次调用sql依赖项更改事件。请指导或帮助我，我该如何处理这种情况。我感谢您宝贵的时间和精力。

signalr默认在c＃

0 个答案: