public void Start()
{
_SynchronizationContext = SynchronizationContext.Current;
if (ConString == "" || TableName == "" || CmdText == "")
{
return;
}
switch (IsManyService)
{
case true:
SqlDependency.Start(ConString);
break;
default:
SqlDependency.Stop(ConString);
SqlDependency.Start(ConString);
break;
}
try
{
if (Connection == null)
{
Connection = new SqlConnection(ConString);
}
Command = new SqlCommand(CmdText, Connection);
if (dataToWatch == null)
{
dataToWatch = new DataSet();
}
dataToWatch.Clear();
Command.Notification = null;
Dependency = new SqlDependency(Command); //https://stackoverflow.com/questions/20503286/using-sqldependency-with-named-queues
Dependency.OnChange += Dependency_OnChange;
using (SqlDataAdapter adapter = new SqlDataAdapter(Command))
{
adapter.Fill(dataToWatch, TableName);
}
//OnSqlChangeData(Dependency, null);
SqlChange?.Invoke(this, new SqlChangeEventArgs()
{
TableDataSet = dataToWatch
});
}
catch (Exception)
{
throw;
}
}
public void OnSqlChangeData(object sender, SqlNotificationEventArgs e)
{
Dependency = (SqlDependency)sender;
Dependency.OnChange -= Dependency_OnChange;
if (e.Type != SqlNotificationType.Change)
{
return;
}
dataToWatch.Clear();
Command.Notification = null;
Dependency = new SqlDependency(Command);
Dependency.OnChange += Dependency_OnChange;
using (SqlDataAdapter adapter = new SqlDataAdapter(Command))
{
adapter.Fill(dataToWatch, TableName);
}
SqlChange?.Invoke(this, new SqlChangeEventArgs()
{
TableDataSet = dataToWatch
});
}
