如何从C＃中的另一个类访问计时器

Question

See Also: How to enable a timer from a different thread/class

The timer is assigned to a form and I'd like to Enable it at a specific location,but from another class. I don't want to make it public

This is the code I use to access memo

    public string TextValue
    {
        set
        {
            if (this.Memo.InvokeRequired)
            {
                this.Invoke((MethodInvoker)delegate
                {
                    this.Memo.Text += value + "\n";
                });
            }
            else
            {
                this.Memo.Text += value + "\n";
            }
        }
    }

    public static void addtxt(string txt)
    {
        var form = Form.ActiveForm as Form1;
        if(form != null)
            form.TextValue = txt;
    }

Answer 1

If you don't want to expose the timer itself, expose a public method or property that you can call to enable the timer. Obviously the Form that enables the Timer will need a reference to the Form that owns the Timer .

Answer 2

How would you like to enable the timer ? What action is undertaken in order to enable it ?

Is it possible to add an event to the class from which you want to enable the timer, and, on the form which contains the timer, subscribe to that event ? In the event-handler for that event, you can then enable the timer.

When the other class raises the event, the eventhandler will enable the timer.

public class SomeOtherClassThatDoesStuff
{
   public event EventHandler SomethingHappened;

   public void DoStuff()
   {
      ...
      if( SomethingHappened != null )
         SomethingHappened;
      ...
   }
}

public class Form1
{

    private void Button1_Click(object sender, EventArgs e )
    {

      SomeOtherClassThatDoesStuff o = new SomeOtherClassThatDoesStuff();
      o.SomethingHappened += new EventHandler(EnableTimer);

      o.DoStuff();
    }

    private void EnableTimer(object sender, EventArgs e )
    {
       myTimer.Enabled = true;
    }
}

Something like this. (I haven't tested, nor did I even compile it, but I think you'll catch the drift :) ).

Answer 3

将计时器设置为“内部”，则程序集中的其他类均可使用它。

Answer 4

You could add an accessor method to Enable the timer, this would allow yu to keep the timer private but make the method public, would that work?

Also, you could look at making the accessor protected or internal , depending on who is calling it it may not need to be public.