Sqldependency c# là gì

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C# SqlDependency Start(string connectionString) Starts the listener for receiving dependency change notifications from the instance of SQL Server specified by the connection string.

From Type:

System.Data.SqlClient.SqlDependency

Start() is a method.

Syntax

Start is defined as:

public static bool Start (string connectionString);

Parameters:

C# SqlDependency Start() has the following parameters:

  • connectionString - The connection string for the instance of SQL Server from which to obtain change notifications.

Return

true if the listener initialized successfully; false if a compatible listener already exists.

Example

The following examples show how to use C# SqlDependency.Start(string connectionString).

Example 1

using System.Configuration;
using System.Data.SqlClient;
using System.Web.Mvc;
using System.Web.Routing;
using Owin;/*  w  ww    .  d  e  m o 2  s   .   c  o  m*/
namespace SignelRDB
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            RouteTable.Routes.MapOwinRoute("Home/Index", app => app.RunSignalR());
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            SqlDependency.Start(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString); 
        }
        protected void Application_End()
        {
            SqlDependency.Stop(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
        }
    }
}

Example 2

using System;/* w  w   w  . d e  m   o 2    s.    c o  m */
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
namespace SMS
{
    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            SqlDependency.Start(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
        }
        protected void Application_End()
        {
            SqlDependency.Stop(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
        }
    }
}

Example 3

using System;//    w w  w   .d  e   m o  2    s  . c o  m  
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
using System.Configuration;
namespace SignalRScaleOutNotifications
{
    public class MvcApplication : System.Web.HttpApplication
    {
        string connString = ConfigurationManager.ConnectionStrings["signalRConnection"].ConnectionString;
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            SqlDependency.Start(connString);
        }
        protected void Application_End()
        {
            SqlDependency.Stop(connString);
        }
    }
}

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Related

  • C# SqlDependency SqlDependency(System.Data.SqlClient.SqlCommand command, string options, int timeout)
  • C# SqlDependency Id
  • C# SqlDependency OnChange
  • C# SqlDependency Start(string connectionString)
  • C# SqlDependency Start(string connectionString, string queue)
  • C# SqlDependency Stop(string connectionString)
  • C# SqlDependency Stop(string connectionString, string queue)