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A quick blog post about a bug I encountered today with the LongListMultiSelector : adding 2 items in its SelectedItem property actually adds 2 items (twice the same) in the SelectedItem collection.<\/strong> <\/p>\n This is quite boring because it also raises the SelectionChanged event twice and can mess up your business logic.<\/p>\n Let’s see how to fix this temporary (I hope!) issue : The solution is to ‘fake’ an user selection using the LongListMultiSelectorItem<\/strong> which is the container of each item.<\/p>\n So instead of writing this code : you have to write this code : A quick blog post about a bug I encountered today with the LongListMultiSelector : adding 2 items in its SelectedItem property actually adds 2 items (twice the same) in the SelectedItem collection. This is quite…<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[14,15,44,45,31],"_links":{"self":[{"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/posts\/1392"}],"collection":[{"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/comments?post=1392"}],"version-history":[{"count":7,"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/posts\/1392\/revisions"}],"predecessor-version":[{"id":1399,"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/posts\/1392\/revisions\/1399"}],"wp:attachment":[{"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/media?parent=1392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/categories?post=1392"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.jonathanantoine.com\/wp-json\/wp\/v2\/tags?post=1392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n
\nThe problem is that the LongListMultiSelector listen to the changes(add\/remove\/replace\/clear) in it’s SelectedItem collection so we can’t use it directly. <\/p>\n
\n[csharp]
\nforeach (var item in LongListMultiSelector.ItemsSource)
\n{
\n \/\/LongListMultiSelector.SelectedItems.Add(item);
\n}
\n[\/csharp]<\/p>\n
\n[csharp]
\nforeach (var item in LongListMultiSelector.ItemsSource)
\n{
\n var container = LongListMultiSelector.ContainerFromItem(item)
\n as LongListMultiSelectorItem;
\n if (container != null) container.IsSelected = true;
\n}
\n[\/csharp]<\/p>\n","protected":false},"excerpt":{"rendered":"