Passing in an Action<string> is an asynchronous programming trick - I think
this is "functional programming" (and someone will hopefully correct me if
I'm wrong.
Basically you would declare your method like:
private void
getUpcomingRaces(Action<List<string>> callback) { ... }
Then you would call it with:
private void SomeMethod()
{
getUpcomingRaces((list) => {
Console.WriteLine("list received of size " + list.Count);
foreach (var line in list)
{
Console.WriteLine(line);
}
});
}
Or you could pass in a method group instead of an anonymous method if you
prefer - e.g.:
private void SomeMethod()
{
getUpcomingRaces(ListProcessor);
}
private void ListProcessor(List<string> list)
{
Console.WriteLine("list received of size " + list.Count);
foreach (var line in list)
{
Console.WriteLine(line);
}
}
On 2 March 2012 13:43, nodoid <[email protected]> wrote:
> Hi,
>
> That's getting me a good bit further, but there is still something not
> quite
> right. The new code looks like this
>
> private string rTrack;
>
> public List<string>getUpcomingRaces(string track)
> {
> List<string>f = new List<string>();
> rTrack = track;
> f = getUpcomingRacesCallBack(cb);
> return f;
> }
>
> private List<string>
> getUpcomingRacesCallBack(Action<List<string>> callback)
> {
> List<string> f = new List<string>();
> if (checkForNetwork(true) != true)
> {
> f.Add("No network available");
> callback(f);
> }
> else
> {
> List<POHWS.webservice.UpcomingRaces> tableData = new
> List<POHWS.webservice.UpcomingRaces>();
> POHWS.webservice.Service1 Service3 = new
> POHWS.webservice.Service1();
>
> try
> {
> Service3.BeginGetUpcomingRacesList(rTrack,
> delegate(IAsyncResult iar)
> {
> tableData =
> Service3.EndGetUpcomingRacesList(iar).ToList();
>
> Android.App.Application.SynchronizationContext.Post(delegate
> {
> if (tableData.Count == 0)
> {
> tableData[0].PostTime = "No Upcoming Races
> Found within the next 7 days";
> }
> else
> {
> for (int i = 0; i < tableData.Count; ++i)
> f.Add(tableData[i].PostTime);
> }
> callback(f);
> //return f;
> }, null);
> callback(f);
> }, null);
> }
> catch (Exception oe)
> {
> f.Add(oe.ToString());
> callback(f);
> //return f;
> }
> }
> return f;
> }
>
> I have tried this code and it returns nothing (much as before). Now, if I
> change the 2nd method to a void, how can I then propogate List<string> to
> return it to the caller?
>
> Thanks
>
> Paul
>
> --
> View this message in context:
> http://mono-for-android.1047100.n5.nabble.com/Nothing-being-passed-back-from-a-webservice-tp5529892p5531003.html
> Sent from the Mono for Android mailing list archive at Nabble.com.
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