CODEWITHSUNDEEP
c#
Kernel
Kernel

Reputation: 165

need delay function in c#

I have a problem using Thread.sleep(seconds), it pauses all my execution in sleeping state. But I tried another solutions also using for loop, however what I'm expecting it's not working.

When the login button is clicked:

  1. Action report="on progressing";
  2. After another 2 seconds it will be "trying to connect to the database"
  3. then after opening database it will be like "database connected successfully"

Here is the code:

private void Loginbtn_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
   if(userText.Text!=String.Empty && passText.Password!=String.Empty){
   ProgressForm.Visibility = System.Windows.Visibility.Visible;
   LoginForm.Visibility = System.Windows.Visibility.Hidden;
   delay(2);
   actionReport.Text = "Try to Connecting the database";
   String ConnectionString = "server=127.0.0.1;uid=root;pwd='';database=smsdb;";
   MySqlConnection con = new MySqlConnection(ConnectionString);

   try {
      con.Open();
      delay(2);
      actionReport.Text = "Database Connected Sucessfully";
       } 

   catch(MySqlException sqle){
      actionReport.Text = sqle.Message; 
  }
} 
    else {
   MessageBox.Show("Please enter the user name and password to verify","Notification",MessageBoxButton.OK,MessageBoxImage.Information);
     }
 }

private void delay(int seconds) 
{
for(long i=0;i<seconds*3600; i++){
//empty
}

Please someone help me.

Upvotes: 1

Views: 4143

Answers (3)

Kernel
Kernel

Reputation: 165

I found answer like this

delay("Try to Connecting the database");

delay like this.

public void delay(string message) {
    var frame = new DispatcherFrame();
    new Thread((ThreadStart)(() =>
    {
        Thread.Sleep(TimeSpan.FromSeconds(2));
        frame.Continue = false;
    })).Start();
Dispatcher.PushFrame(frame);
        actionReport.Text=message;
    }

Thanks friends! to reply me.

Upvotes: 0

Adam Straughan
Adam Straughan

Reputation: 2848

You first need to look up and understand performing processing on a background thread. The main rules being;

  1. You should never block the UI
  2. don't try to talk to the UI thread from a background thread
  3. If you call Thread.Sleep, it's probably wrong

Your questions demonstrate an opportunity for you to learn new architectural patterns. These look like good candidates;

http://www.codeproject.com/Articles/99143/BackgroundWorker-Class-Sample-for-Beginners

http://www.codeproject.com/Articles/26148/Beginners-Guide-to-Threading-in-NET-Part-1-of-n

Upvotes: -1

Servy
Servy

Reputation: 203838

await (introduced in C# 5.0) with Task.Delay makes this trivially easy:

public async void Loginbtn_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    actionReport.Text = "Trying to Connecting to the database";
    await Task.Delay(2);
    actionReport.Text = "Connected";
}

For a C# 4.0 solution it's a tad messier, but not a whole lot:

public async void Loginbtn_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    actionReport.Text = "Trying to Connecting to the database";
    Task.Delay(2).ContinueWith(_ =>
        {
            actionReport.Text = "Connected";
        }, CancellationToken.None
        , TaskContinuationOptions.None
        , TaskScheduler.FromCurrentSynchronizationContext());
}

The key point here is that at no point are you blocking the UI thread, you're simply letting the UI thread continue on processing events for two seconds before giving it something to do.

Upvotes: 3

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