Wait inside method until event is captured

Question

I have this issue with a method in C#. I made a method that calls a function from a dll its called Phone.GetLampMode(); Now Phone.GetLampMode doesn

Answer 1

You can wrap the handler in an asynchronous method, which should look something like this (untested):

public async Task checkLamp(int iLamp)
{
    Phone.ButtonIDConstants btn = new Phone.ButtonIDConstants();
    btn = Phone.ButtonIDConstants.BUTTON_1;
    btn += iLamp;

    var tcs = new TaskCompletionSource();
    var handler = (sender, e) => {
        Phone.OnGetLampModeResponse -= handler;
        var test = e.getLampModeList[0].getLampMode.ToString();
        tcs.SetResult(true);
    };
    Phone.OnGetLampModeResponse += handler;

    Phone.GetLampMode(btn, null);

    return tcs.Task;
}

In your calling method, you would write:

var returnValue = await checkLamp(iLamp);

This has the advantage that your user interface does not block while the process is waiting for the response.

Here's a blog entry on this issue. Note that Framework 4.5 is required.

• http://blogs.msdn.com/b/lucian/archive/2012/11/28/how-to-await-a-button-click.aspx