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POEditing XML in Windows Store using MVVM and Message
 

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  1. POEditing XML in Windows Store using MVVM and Message
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    <p>In my application I am creating XML in <a href="https://github.com/tkowalczyk/NumbersGame/blob/master/NumbersGame/NumbersGame.Win8/App.xaml.cs" rel="nofollow">App.xaml.cs</a> like this:</p> <pre><code>public async static void CreateBadgesXML() { StorageFolder sf = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Data", CreationCollisionOption.OpenIfExists); StorageFile st = await sf.CreateFileAsync("Badgess.xml", CreationCollisionOption.ReplaceExisting); XmlDocument dom = new XmlDocument(); XmlElement x; x = dom.CreateElement("badges"); dom.AppendChild(x); XmlElement x1 = dom.CreateElement("badge"); XmlElement x11 = dom.CreateElement("id"); x11.InnerText = "1"; x1.AppendChild(x11); XmlElement x12 = dom.CreateElement("name"); x12.InnerText = "Badge One"; x1.AppendChild(x12); XmlElement x13 = dom.CreateElement("pictureurl"); x13.InnerText = "two.png"; x1.AppendChild(x13); XmlElement x14 = dom.CreateElement("isachieved"); x14.InnerText = "false"; x1.AppendChild(x14); x.AppendChild(x1); await dom.SaveToFileAsync(st); } </code></pre> <p>Next in <a href="https://github.com/tkowalczyk/NumbersGame/blob/master/NumbersGame/NumbersGame.Shared/ViewModel/MainViewModel.cs" rel="nofollow">MainViewModel</a> I am binding these data using reposiory pattern to ObservableCollection like this:</p> <pre><code>IList&lt;Badge&gt; list = await _badgeService.GetAll(); BadgesList = list.ToObservableCollection&lt;Badge&gt;(); </code></pre> <p>But when I am going to edit this XML in another View which is connected to another VievModel (<a href="https://github.com/tkowalczyk/NumbersGame/blob/master/NumbersGame/NumbersGame.Shared/ViewModel/QuestionViewModel.cs" rel="nofollow">QuestionViewModel</a>) like this:</p> <pre><code>public async Task Update(int id) { StorageFolder sf = await ApplicationData.Current.LocalFolder.CreateFolderAsync("Data", CreationCollisionOption.ReplaceExisting); StorageFile st = await sf.CreateFileAsync("Badgess.xml", CreationCollisionOption.ReplaceExisting); XmlDocument dom = new XmlDocument(); XmlElement x; x = dom.CreateElement("badges"); dom.AppendChild(x); XmlElement x1 = dom.CreateElement("badge"); XmlElement x11 = dom.CreateElement("id"); x11.InnerText = "1"; x1.AppendChild(x11); XmlElement x12 = dom.CreateElement("name"); x12.InnerText = "Badge One"; x1.AppendChild(x12); XmlElement x13 = dom.CreateElement("pictureurl"); x13.InnerText = "two.png"; x1.AppendChild(x13); XmlElement x14 = dom.CreateElement("isachieved"); x14.InnerText = "true"; x1.AppendChild(x14); x.AppendChild(x1); await dom.SaveToFileAsync(st); } </code></pre> <p>And sending a Message from QuestionViewModel to MainViewModel like this:</p> <pre><code>Messenger.Default.Send&lt;CleanUp&gt;(new CleanUp()); </code></pre> <p>And try to bind this collection again:</p> <pre><code>private void CallCleanUp(CleanUp obj) { BadgesList = null; GetBadges(); } </code></pre> <p>I get an error XmlException "Root element is missing." I do not understand why after XML update, content of this file is empty? Any ideas?</p> <p><strong>EDIT</strong> After changes in update method, now I've got an UnauthorizedAccessException in <code>GetAll()</code> method in my <a href="https://github.com/tkowalczyk/NumbersGame/blob/master/NumbersGame/NumbersGame.Win8/Services/XML/BadgeService.cs" rel="nofollow">BadgeService</a>, still strange because in appears only after update XML.</p>
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    1. USTomasz Kowalczyk
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