Can I tie an anonymous function to a Timer's tick event?

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渐次进展 2021-02-07 16:09

If a Tick-handling function will only be used in one context (i.e. always in the same function in combination with the same Timer object), why bother make it a separate function

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  • 2021-02-07 16:30

    You use the delegate keyword for anonymous methods:

    Timer myTimer = new Timer();
    myTimer.Tick += delegate(object sender, EventArgs e) {
      MessageBox.Show("Hello world!");
    };
    

    In C# 3.0 and later, you can also use lambdas:

    Timer myTimer = new Timer();
    myTimer.Tick += (sender, e) => MessageBox.Show("Hello world!");
    
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  • 2021-02-07 16:35

    You're looking for Anonymous Methods:

    myTimer.Tick += delegate (object sender, EventArgs e) {
        MessageBox.Show("Hello world!");
    };
    

    You can also omit the parameters:

    myTimer.Tick += delegate {
        MessageBox.Show("Hello world!");
    };
    

    In C# 3.0, you can also use a Lambda Expression:

    myTimer.Tick += (sender, e) => {
        MessageBox.Show("Hello world!");
    };
    
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  • 2021-02-07 16:37

    A complete example would be:

        Timer timer = new Timer();
        timer.Interval = 500;
        timer.Tick += (t, args) =>
            {
                timer.Enabled = false;
                /* some code */
            };
        timer.Enabled = true;
    
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