void SetupMessaging()
{
// Is is for when the user flags a crime news article. Since DisplayActionSheet is only accessible
// from page classes, this message will be sent up by a NewsCard that wants to ask the user why
// a news article should be flagged.
#pragma warning disable RECS0165 // Asynchronous methods should return a Task instead of void
MessagingCenter.Subscribe <object, NewsFlagConcern>(this, "FlagArticle", async(sender, arg) =>
#pragma warning restore RECS0165 // Asynchronous methods should return a Task instead of void
{
var action = await DisplayActionSheet("What's wrong with the article?", "Cancel", null, "Story is not about this crime", "Spam or advertising", "Duplicate", "Opinion column or blog");
if (action != "Cancel")
{
var concern = new NewsFlagConcern();
concern.Reason = action;
concern.URL = arg.URL;
concern.DCN = arg.DCN;
// Send a message back to the listening news card.
MessagingCenter.Send <object, NewsFlagConcern>(sender, "SubmitFlaggedArticle", concern);
}
});
// This is in case a user flags a news article but that fails.
MessagingCenter.Subscribe <object, string>(this, "FlagFailed", (sender, arg) =>
{
DisplayAlert("Problem flagging this article", arg, "OK");
});
}
void ArticleFlagged(object sender, System.EventArgs e)
{
var concern = new NewsFlagConcern();
concern.DCN = _dcn;
concern.URL = _url;
// User has identified this as a bad article. Ask the parent page to display a dialog asking why.
MessagingCenter.Send <object, NewsFlagConcern>(this, "FlagArticle", concern);
}