Hi i am trying to implement sqldependancy with signalr for new database changes. but the problem is if i edit only one row then also sqldependancy is firing more time. and some time it is not firing. I have web application without MVC. bellow is my code
public void page_load(object sender, EventArgs e)
{
//notification.GetAllUnreadSalesNotifications();
NewScrapNotifications();
}
public void NewScrapNotifications()
{
string message = string.Empty;
using (SqlConnection connection = new SqlConnection(IFTDAL.IFTCommon.DSN))
{
string query = "SELECT [Message] FROM [dbo].[DummyData]";
using (SqlCommand command = new SqlCommand(query, connection))
{
command.Notification = null;
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
connection.Open();
SqlDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
reader.Read();
message = reader[0].ToString();
}
}
}
}
private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
{
if (e.Type == SqlNotificationType.Change)
{
IFTHub nHub = new IFTHub();
nHub.NotfiyAllClients();
// NewScrapNotifications();
//LoadDashboardByDashboardViewID(1);
}
}
and I also have bellow code in Globa.asax
void Application_Start(object sender, EventArgs e)
{
// Code that runs on application startup
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
SqlDependency.Start(DAL.DSN);
}
protected void Application_End(object sender, EventArgs e)
{
SqlDependency.Stop(DAL.DSN);
}
You are creating new SQLDependency on each page load (refresh). I bet there is correlation between number of page reloads and number of notifications page is receiving via SignalR.
Register your notification only once per app lifetime...
Related
Starting with this...
https://github.com/jeremytammik/RevitLookup/blob/master/CS/EventTrack/Events/ApplicationEvents.cs
I'm trying to add an event listener for a synchronization event. the code below throws an error stating that the m_app is null. Can i not subscribe to this event while Revit is starting up?
I was able to do this before with application.ViewActivated += ..... Im wondering if this has something to do with DB vs UI driven events and when they are allowed to be subscribed to? I just don't know.
namespace RevitModelHealth
{
public class checkHealth : IExternalApplication
{
// Document doc;
static public Autodesk.Revit.ApplicationServices.Application m_app = null;
public Result OnShutdown(UIControlledApplication application)
{
return Result.Succeeded;
}
public Result OnStartup(UIControlledApplication application)
{
m_app.DocumentSynchronizingWithCentral += new EventHandler<DocumentSynchronizingWithCentralEventArgs>(m_app_DocumentSavingToCentral);
return Result.Succeeded;
}
void m_app_DocumentSavingToCentral(object sender, Autodesk.Revit.DB.Events.DocumentSynchronizingWithCentralEventArgs e)
{
MessageBox.Show("asd","asd");
}
}
}
Here is updated code reflecting my response to the first answer. The message box opens when the document is loaded. No errors are thrown when I try to initialize the synchronization event handlers, however, neither of the message boxes open before or after a synchronization event.
public class checkHealth : IExternalApplication
{
// Document doc;
static public Autodesk.Revit.ApplicationServices.Application m_app;
public Result OnShutdown(UIControlledApplication application)
{
return Result.Succeeded;
}
public Result OnStartup(UIControlledApplication application)
{
application.ControlledApplication.DocumentOpened += new EventHandler<DocumentOpenedEventArgs>(app_DocOpened);
return Result.Succeeded;
}
public void app_DocOpened(object sender, DocumentOpenedEventArgs args)
{
MessageBox.Show("asd","asd");
m_app.DocumentSynchronizingWithCentral += new EventHandler<DocumentSynchronizingWithCentralEventArgs>(m_app_DocumentSavingToCentral);
m_app.DocumentSynchronizedWithCentral += new EventHandler<Autodesk.Revit.DB.Events.DocumentSynchronizedWithCentralEventArgs>(m_app_DocumentSavedToCentral);
}
void m_app_DocumentSavingToCentral(object sender, Autodesk.Revit.DB.Events.DocumentSynchronizingWithCentralEventArgs e)
{
MessageBox.Show("sync", "sync");
}
void m_app_DocumentSavedToCentral(object sender, Autodesk.Revit.DB.Events.DocumentSynchronizedWithCentralEventArgs e)
{
MessageBox.Show("Doone", "Done");
}
}
this worked.... Thanks largely in part to the SDK sample project EventsMonitor
namespace RevitModelHealth
{
public class checkHealth : IExternalApplication
{
public Result OnShutdown(UIControlledApplication application)
{
return Result.Succeeded;
}
public Result OnStartup(UIControlledApplication application)
{
application.ControlledApplication.DocumentSynchronizingWithCentral += new EventHandler<DocumentSynchronizingWithCentralEventArgs>(app_syncStart);
application.ControlledApplication.DocumentSynchronizedWithCentral += new EventHandler<DocumentSynchronizedWithCentralEventArgs>(app_syncOver);
return Result.Succeeded;
}
public void app_syncStart(object o ,DocumentSynchronizingWithCentralEventArgs args)
{
MessageBox.Show("","Stasrting");
}
public void app_syncOver(object o,DocumentSynchronizedWithCentralEventArgs args)
{
MessageBox.Show("", "Over");
}
}
}
Try
application.ControlledApplication.DocumentSynchronizingWithCentral += new EventHandler<DocumentSynchronizingWithCentralEventArgs>(m_app_DocumentSavingToCentral)
in your OnStartup() method.
The call is failing because instance member m_app is initialized to null.
The UIApplication.ControlledApplication object that raises the DocumentSynchronizingWithCentralEventArgs is being accessible from the parameter to OnStartup.
You can try this:
public void app_DocOpened(object sender, DocumentOpenedEventArgs args)
{
MessageBox.Show("asd","asd");
Autodesk.Revit.ApplicationServices.Application m_app = args.Document.Application;
m_app.DocumentSynchronizingWithCentral += new EventHandler<DocumentSynchronizingWithCentralEventArgs>(m_app_DocumentSavingToCentral);
m_app.DocumentSynchronizedWithCentral += new EventHandler<Autodesk.Revit.DB.Events.DocumentSynchronizedWithCentralEventArgs>(m_app_DocumentSavedToCentral);
}
I created a WCF service using Visual Studio 2017 Community version (employing TAP). I used the AsyncAutoResetEvent from the Microsoft.VisualStudio.Threading reference but it seems that this waithandle is not getting signalled after calling the Set function. The service is hosted in a console application. The traces generated by the NonBlockingConsole.WriteLine display properly however.
server:
AsyncAutoResetEvent aare = new AsyncAutoResetEvent(false);
public async Task<string> TestfuncAsync()
{
string strRet = "finished";
NonBlockingConsole.WriteLine("before autoresetevent");
await aare.WaitAsync();
NonBlockingConsole.WriteLine("after autoresetevent"); //is not traced even if asyncautoresetevent is set
return strRet;
}
void SetEvent()
{
aare.Set();
NonBlockingConsole.WriteLine("auto reset event set");
}
client UI:
private async void button1_Click(object sender, EventArgs e)
{
string value = await client.TestfuncAsync();
...
}
private void button2_Click(object sender, EventArgs e)
{
client.SetEvent();
}
NonBlockingConsole class: (reused from Does Console.WriteLine block?)
public static class NonBlockingConsole
{
private static BlockingCollection<string> m_Queue = new BlockingCollection<string>();
static NonBlockingConsole()
{
var thread = new Thread(
() =>
{
while (true) Console.WriteLine(m_Queue.Take());
}
);
thread.IsBackground = true;
thread.Start();
}
public static void WriteLine(string value)
{
value = DateTime.Now.ToString("<HH:mm:ss.fff>") + " " + value + " <ThreadID>: " + Thread.CurrentThread.ManagedThreadId.ToString();
m_Queue.Add(value);
}
}
I'm developing windows phone 8 application.
I'm having some difficulty with my sqlite prepare statement. I get an error saying my table does not exist, although I've checked in multiple places for it, and it does exist.
It did work until I added some new tables to the SQLite database and now it just doesn't recognise any of the tables - so I'm confused!
I have also tried hardcoding the full path.. e.g. C:\App\datbase.db etc
Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.IO.IsolatedStorage;
using SQLitePCL;
namespace WP7.VideoScanZXing.SampleApp
{
public partial class Page1 : PhoneApplicationPage
{
string connLOCDAT = "Data Source =\\Resources\\DB\\MCRS_Data.sdf;Persist Security Info=False";
string connLOCLUDAT = "Data Source =\\Resources\\DB\\MCRSLU_MYCUBE.sdf;Persist Security Info=False";
public Page1()
{
InitializeComponent();
//check the isolated storage to see if the user has saved a username and password.
CheckIsoStore();
}
public void CheckIsoStore() {
if (IsolatedStorageSettings.ApplicationSettings.Contains("UsrEmail"))
{
//The user has saved details
//populate the email and password box automatically
//Dont forget to check the save details box too
tbEmail.Text = IsolatedStorageSettings.ApplicationSettings["UsrEmail"].ToString();
pbPassword.Password = IsolatedStorageSettings.ApplicationSettings["UsrPassword"].ToString();
cbSaveDetails.IsChecked = true;
}
}
public void failedLogin()
{
MessageBox.Show("Error: Email or Password are incorrect. Please try again.");
tbEmail.Focus();
}
private void btnLogin_Click(object sender, RoutedEventArgs e)
{
//validate user
string strEmail = tbEmail.Text;
string strPassword = pbPassword.Password.ToString();
//bool bolValidUser = false;
//validate username and password here!
if (bolValidUser(strEmail, strPassword) == true)
{
//user has been validated and can continue.
if (cbSaveDetails.IsChecked == true)
{
//save the users details here
IsolatedStorageSettings.ApplicationSettings["UsrEmail"] = strEmail;
IsolatedStorageSettings.ApplicationSettings["UsrPassword"] = strPassword;
IsolatedStorageSettings.ApplicationSettings.Save();
}
else {
IsolatedStorageSettings.ApplicationSettings.Remove("UsrEmail");
IsolatedStorageSettings.ApplicationSettings.Remove("UsrPassword");
IsolatedStorageSettings.ApplicationSettings.Save();
}
NavigationService.Navigate(new Uri("/MenuPage.xaml", UriKind.Relative));
}
else {
//redirect the user back to the home screen with a message
//NavigationService.Navigate(new Uri("/LoginPage.xaml?message=Login error ", UriKind.Relative));
failedLogin();
}
}
public static SQLiteConnection dbConn;
public bool bolValidUser(string Uname, string PWord)
{
dbConn = new SQLitePCL.SQLiteConnection(Windows.ApplicationModel.Package.Current.InstalledLocation.Path + #"\bizData.db", SQLiteOpen.READWRITE);
{
//StorageFile databaseFile = await .GetFileAsync("bizData.db");
//await databaseFile.CopyAsync(ApplicationData.Current.LocalFolder);
}
//using (var statement = dbConn.Prepare(#"SELECT * FROM [MCRS_LU_Login] WHERE [Email] = " + Uname + " AND [Password] = " + PWord))
using (var statement = dbConn.Prepare(#"SELECT * FROM [BARCODES]"))
{
if (statement.Step() == SQLiteResult.ROW)
{
//new MessageDialog(Convert.ToString(statement.DataCount)).ShowAsync();
//if ()
string strLinkedUser;
strLinkedUser = statement[3].ToString();
IsolatedStorageSettings.ApplicationSettings["UsrADName"] = statement[0].ToString();
return true;
}
else
{
return false;
//await msgDialog.ShowAsync();
}
}
}
private void tbEmail_GotFocus(object sender, RoutedEventArgs e)
{
imgMail.Visibility = Visibility.Collapsed;
}
private void tbEmail_LostFocus(object sender, RoutedEventArgs e)
{
if(tbEmail.Text =="") {
imgMail.Visibility = Visibility.Visible;
}
}
private void pbPassword_LostFocus(object sender, RoutedEventArgs e)
{
if (pbPassword.Password == "")
{
imgPassword.Visibility = Visibility.Visible;
}
}
private void pbPassword_GotFocus(object sender, RoutedEventArgs e)
{
imgPassword.Visibility = Visibility.Collapsed;
}
}
}
is there a way of randomizing the user agent using Gecko Browser ? i tried doing it on a separated thread but i couldn't since Gecko must be ran on the same Thread.
try this
Create new class Global.cs
public class Globals
{
public static ArrayList Useragent = new ArrayList();
}
next in your form1 code
private string GetUserAgent()
{
Random Rnd = new Random();
return Convert.ToString(Globals.Useragent[Rnd.Next(0, Globals.Useragent.Count)]);
}
load your file with user agent lines
private void button2_Click(object sender, EventArgs e)
{
var OpenFile = new OpenFileDialog();
OpenFile.Filter = "*.txt | *.txt";
OpenFile.ShowDialog();
if (OpenFile.FileName != "")
{
Globals.Useragent.AddRange(File.ReadAllLines(OpenFile.FileName));
}
else
{
MessageBox.Show("Chooee Your User agent file");
}
}
======================
private string GetUserAgent()
{
Random Rnd = new Random();
return Convert.ToString(Globals.Useragent[Rnd.Next(0, Globals.Useragent.Count)]);
}
Ok its finish!
Now you can do this - input your new code GetUserAgent();
private void button1_Click(object sender, EventArgs e)
{
CookieManager.RemoveAll();
Gecko.GeckoPreferences.User["general.useragent.override"] = GetUserAgent();
}
I have some code here that connects to my Mysql database. It checks your username and password and if your login was successful and it retrieves the phone number under that account. How would the SQL Query look like for retrieving the phone number once connected? Then how would I be able to display that phone number on a label?
Have a look at this tutorial, should cover most of what you would need to know about connecting to MySQL, executing queries and displaying results:
VBMySQL Tutorial - Part 4
There are a number of other tutorials on that site, should get you going.
If part 4 gets into too much depth too quickly, check out part 1 first
public partial class _Default : System.Web.UI.Page
{
string strCon = ConfigurationManager.AppSettings["myConString"];
SqlConnection con;
SqlCommand com;
public string strPKDataValue;
public SqlDataReader dr;
protected void Page_Load(object sender, EventArgs e)
{
con = new SqlConnection(strCon);
}
protected void Button5_Click(object sender, EventArgs e)
{
com = new SqlCommand("select * from student", con);
con.Open();
try
{
dr = com.ExecuteReader(CommandBehavior.CloseConnection);
if (dr.HasRows)
{
if (dr.Read())
{
Label9.Text = Convert.ToString(dr["stuid"]);
}
}
}
catch (Exception ex)
{
Response.Write("Error :" + ex.Message);
}
finally
{
dr.Close();
con.Close();
}
}
}