private void AutoUpdate_FormClosed(object sender, FormClosedEventArgs e)
{
// stop notification monitor
ImmediateNotificationRegister <Product> .StopMonitor(warehouse);
RegularlyNotificationRegister <Product> .StopMonitor(warehouse);
}
private void AutoUpdate_Load(object sender, EventArgs e)
{
btnGetData.Enabled = CanRequestNotifications();
CreateDatabaseIfNotExist();
// start immediate notification register
ImmediateNotificationRegister<Product>.StartMonitor(warehouse);
RegularlyNotificationRegister<Product>.StartMonitor(warehouse);
}
private void GetData_Click(object sender, EventArgs e)
{
Decimal lowPrice, highPrice;
if (!Decimal.TryParse(txtLowPrice.Text, out lowPrice))
{
lowPrice = 0;
}
if (!Decimal.TryParse(txtHighPrice.Text, out highPrice))
{
highPrice = Decimal.MaxValue;
}
// Create the query.
iquery = from p in warehouse.Products
where p.Price >= lowPrice && p.Price <= highPrice
select p;
if (this.rabtnImUpdate.Checked)
{
// If need to update immediately, use ImmediateNotificationRegister to register
// SqlDependency.
notification = new ImmediateNotificationRegister <Product>(warehouse, iquery);
notification.OnChanged += NotificationOnChanged;
}
else
{
// We can use RegularlyNotificationRegister to implement update regularly.
if (Int32.TryParse(this.txtInterval.Text, out interval))
{
regularNotificaton = new RegularlyNotificationRegister <Product>(warehouse, iquery, interval * 1000);
regularNotificaton.OnChanged += NotificationOnChanged;
// Only for displaying the progress
this.proBar.Value = 100 / interval;
count = 1;
formTimer = new Timer();
formTimer.Interval = 1000;
formTimer.Tick += formTimer_Tick;
formTimer.Start();
}
else
{
return;
}
}
GetData();
ChangeButtonState();
}
/// <summary>
/// Stop SqlDependency.
/// </summary>
private void StopSqlDependency(object sender, EventArgs e)
{
try
{
if (notification != null)
{
notification.Dispose();
notification = null;
}
if (regularNotificaton != null)
{
regularNotificaton.Dispose();
regularNotificaton = null;
}
if (formTimer != null)
{
formTimer.Stop();
formTimer.Dispose();
formTimer = null;
this.proBar.Value = 0;
}
ChangeButtonState();
}
catch (ArgumentException ex)
{
MessageBox.Show(ex.Message, "Paramter Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
catch (Exception ex)
{
if (ex.InnerException != null)
{
MessageBox.Show(ex.Message + "(" + ex.InnerException.Message + ")", "Failed to Stop SqlDependency", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
MessageBox.Show(ex.Message, "Failed to Stop SqlDependency", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
