C# passing extra parameters to an event

Question

I want to pass three extra parameters to the event :

geocodeService.GeocodeCompleted += new EventHandler<GeocodeService.GeocodeCompletedEventArgs>(geocodeService_GeocodeCompleted);

The parameters are

int id
string color

double heading

private void Geocode(string strAddress, int waypointIndex, int id, string color, double heading)
{


    // Create the service variable and set the callback method using the GeocodeCompleted property.
    GeocodeService.GeocodeServiceClient geocodeService = new GeocodeService.GeocodeServiceClient("BasicHttpBinding_IGeocodeService");

    // NEED TO PASS id, color, heading TO THIS EVENT HANDLER
    geocodeService.GeocodeCompleted += new EventHandler<GeocodeService.GeocodeCompletedEventArgs>(geocodeService_GeocodeCompleted);

    GeocodeService.GeocodeRequest geocodeRequest = new GeocodeService.GeocodeRequest();
    geocodeRequest.Credentials = new Credentials();
    geocodeRequest.Credentials.ApplicationId = ((ApplicationIdCredentialsProvider)BingMap.CredentialsProvider).ApplicationId;
    geocodeRequest.Query = strAddress;
    geocodeService.GeocodeAsync(geocodeRequest, waypointIndex);
}


private void geocodeService_GeocodeCompleted(object sender, GeocodeService.GeocodeCompletedEventArgs e)
{
    GeocodeResult result = null;

    if (e.Result.Results.Count > 0)
    {
        result = e.Result.Results[0];
        if (result != null)
        {
            // this.ShowMarker(result);
            this.ShowShip(result);


        }
    }

}

Where is the event raised? I suspect in the `GeocodeAysnc` method, is there any way we can see this method? — LukeHennerley, Feb 01 '13 at 13:44

score 0 · Answer 1 · edited May 23 '17 at 12:27

0

you can extend GeocodeService.GeocodeServiceClient adding those properties and then use the sender argument in the event method geocodeService_GeocodeCompleted:

var service = (GeocodeService.GeocodeServiceClient) sender;

The quick and dirty(IMHO) version is to use lambda expression:

Pass parameter to EventHandler

edited May 23 '17 at 12:27

Community

1
1

answered Feb 01 '13 at 13:51

giammin

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score 0 · Answer 2 · edited May 23 '17 at 12:12

0

It looks like GeocodeCompletedEventArgs extends AsyncCompletedEventArgs. AsyncCompletedEventArgs has the property UserState which can be used to store state information for asynchronous events. This state is usually passed as a parameter to the method that raises the event.

See this question for more information: Bing GeocodeService userState usage as custom additional parameter

edited May 23 '17 at 12:12

Community

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answered Feb 01 '13 at 13:53

qxn

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i don't agree with your answer because UserState should be used to unique identify the asynchronous task and not to pass data: http://msdn.microsoft.com/en-us/library/system.componentmodel.asynccompletedeventargs.userstate.aspx – giammin Feb 01 '13 at 13:59

C# passing extra parameters to an event

2 Answers2