Visual Studio 2019 编译和处理代码中的问题 (C#)

Question

I understood that after a Visual Studio 2019 update the timers in C# don't fully work.

In my code below, label1 is only set to 3 and nothing after happens. I checked for issues and tested, but I couldn't find the problem

private void Form1_Load(object sender, EventArgs e)
{
    Timer1.Start();
}

private void Form1_Enter(object sender, EventArgs e)
{

}

private void Timer1_Tick(object sender, EventArgs e)
{

    if (Timer1.Interval >2000)
    {
        label1.Text = "2";
    }

    if(Timer1.Interval > 3000)
    {
        label1.Text = "3";
    }
    if(Timer1.Interval > 3999)
    {
        label1.Text = "4";
    }

}

Answer 1

As indicated in your comments, you can do that:

private void Timer1_Tick(object sender, EventArgs e)
{
  if ( Timer1.Interval > 3999 )
  {
    label1.Text = "4";
    Timer1.Interval = newValue1;
  }
  else
  if ( Timer1.Interval > 3000 )
  {
    label1.Text = "3";
    Timer1.Interval = newValue2;
  }
  else
  if ( Timer1.Interval > 2000 )
  {
    label1.Text = "2";
    Timer1.Interval = newValue3;
  }
  else
    DoSomething();
}

I reversed the conditions tests to be coherent and I added some else to optimize and especially to avoid conflicts.

The problem was not with Visual Studio nor a 2019 version nor a Timer but with your code and the algorythm so the rules.

I am not sure of your goal but you can adapt this corrected code.

Answer 2

The interval on a timer is not the elapsed time since the timer has started. It is the amount of time between when the OnTick event is called. I can only assume based off what you have shared that your interval is set between 3001 and 3999. That is why you are only seeing the number 3 appear in your label.