.NET Core Windows Forms app: can't find System.Timers.Timer in visual studio 2019 toolbox

Question

Starting an app in Visual Studio 2019. It is a Windows Forms app using .NET Core 5. I have used System.Timers.Timer previously and found it to be of low jitter. However, I am not able to find it in Visual Studio toolbox. There is a timer under All Windows Forms it is: System.Windows.Forms.Timer There is another timer under Components, it is also System.Windows.Forms.Timer. This timer is not reliable. The numbers of ticks vary quite a bit from what is specified. Fallback is to construct a System.Timers.Timer by hand. Looking at my previous app though it came from the toolbox. Any suggestions are appreciated!

Answer 1

As others said, System.Timers.Timer can not be found in the Toolbox.

Because it doesn't inherit from System.Windows.Forms.Control class. It is not a windows form control.

You can refer to the following code to know how to use it in winforms.

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
        }
        System.Timers.Timer timer;
        private void button1_Click(object sender, EventArgs e)
        {
            timer.Start();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            timer = new System.Timers.Timer(1000);
            timer.Elapsed += Timer_Elapsed;

        }

        private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            richTextBox1.AppendText("Hello, world"+Environment.NewLine);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            timer.Stop();
        }
    }

Result: