Reputation: 27

How can I make the Program wait a Certain time?

So what my exact problem is, is that I want the program to wait 3 seconds and if nothing happens id should execute whatever method I called. But if someone enteres something in these 3 seconds the timer should start again.

Threadsleep doesnt work because it blocks everything and you cant give any inputs.

For example, I have a Filter function and now I dont want to filter right after he entered a letter, I wait 3 seconds and if nothing happend I start filtering. I need this so my Program wont take to long for filtering every single letter.

Here is my current code from the Filtermethod:

private void ContainsFilter(object sender, EventArgs e, TextBox textBox, DataGridView dataGridView, int columnIndex)
        {
            if (textBox.Text != "")
            {
                var value = "";
                var filterText = "";
                for (int i = 0; i < dataGridView.RowCount; i++)
                {
                    value = Convert.ToString(dataGridView.Rows[i].Cells[columnIndex].Value);
                    value = value.ToLower();
                    filterText = textBox.Text;
                    filterText = filterText.ToLower();
                    if (value.Contains(filterText) == false)
                    {
                        dataGridView.Rows[i].Visible = false;
                    }
                    else
                    {
                        dataGridView.Rows[i].Visible = true;
                    }
                }
                return;
            }
            for (int i = 0; i < dataGridView.RowCount; i++)
            {
                dataGridView.Rows[i].Visible = true;
            }
            return;
        }

Upvotes: 0

Answers (3)

Phillip Rochester

Reputation: 87

I had the same request a while ago, the approach I used was to start searching when the user enters at least three letters

Upvotes: -1

AmirJabari

Reputation: 473

It's pretty easy with System.Timers.Timer.
I try to give you a generic answer.

1- Init the timer.

System.Timers.Timer timer = new System.Timers.Timer(3000);
timer.Elapsed += (sender, e) =>
{
    // Filter
};
timer.AutoReset = false; // To execute and filter once, not repeatedly every 3 seconds.

2- Start the timer.

Basically when the text changed. Do this:

timer.Stop();  // Stop the previous timer (in case it is not elapsed yet.)
timer.Start(); // and start it again. To run after 3 seconds.

3- Don't forget to dispose the timer.

When you fill you don't need it anymore. The program stopped, form closed, etc. Do this:

timer.Dispose();

Upvotes: 3

Sharku

Reputation: 1092

You could use the Timer class from C#. With this class you can define an event that is generated after a certain time has passed. You can also stop the timer at any time. In your case, when the user starts giving inputs.