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POInvalidOperationException with MediaLibrary pictures
 

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    <p>I have a windows phone app and get sometimes InvalidOperationExceptions but not sure why and how to avoid them. The problem function from the error report is <code>Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].get_Item</code> and i get this stacktrace</p> <pre><code>"Frame Image Function Offset 0 Microsoft.Xna.Framework.ni.dll Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].get_Item 0x0003e4d8 1 Microsoft.Xna.Framework.ni.dll Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].System.Collections.IEnumerator.get_Current 0x00000006 2 Microsoft.Xna.Framework.ni.dll Microsoft.Xna.Framework.Media.MediaLibraryEnumerator_1[[System.__Canon,_mscorlib]].System.Collections.Generic.IEnumerator_T_.get_Current 0x0000001c 3 MapLense.ni.DLL MapLense.Helper.PictureMapping.Add 0x000000a8 4 MapLense.ni.DLL MapLense.Helper.PictureMapping+_GetPicture_d__b.MoveNext 0x000000f6 5 mscorlib.ni.dll System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess 0x00216c46 6 mscorlib.ni.dll System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification 0x0000003a 7 mscorlib.ni.dll System.Runtime.CompilerServices.TaskAwaiter_1[[System.__Canon,_mscorlib]].GetResult 0x0000001c 8 MapLense.ni.DLL MapLense.Helper.Map+_AddPictureToMap_d__17.MoveNext 0x00000118 9 mscorlib.ni.dll System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess 0x00216c46 10 mscorlib.ni.dll System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification 0x0000003a 11 mscorlib.ni.dll System.Runtime.CompilerServices.TaskAwaiter_1[[System.__Canon,_mscorlib]].GetResult 0x0000001c 12 MapLense.ni.DLL MapLense.MainPage+_ViewModelOnPropertyChanged_d__1e.MoveNext 0x00000204 13 mscorlib.ni.dll System.Runtime.CompilerServices.AsyncMethodBuilderCore._ThrowAsync_b__0 0x00000036" </code></pre> <p>I also tried to add a try-catch block around the code block, but without a result</p> <p> <pre><code>public static bool Add(DBPicture dbpicture) { if (Pictures.ContainsKey(dbpicture.UniqueID)) return true; var root = new MediaLibrary().RootPictureAlbum; foreach (var album in root.Albums) { if (album.Name != AppResources.CameraRollAlbumName) continue; for (var i = 0; i &lt; album.Pictures.Count; i++) { try { var picture = album.Pictures[i]; if (picture.Name == dbpicture.UniqueID) { Pictures.Add(picture.Name, picture); DBPictures.Add(picture.Name, dbpicture); return true; } } catch (System.Exception e) { #if DEBUG Logger.WriteLine("PictureMapping.Add(DBPicture)"); Logger.WriteLine(e); #endif } } } return false; } </code></pre> <p>Thanks for any suggestions</p>
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    1. COI'm having the same issue with songs in the library. Unfortunately, I cannot reproduce it on my device or any emulator. I just know it from many error reports. It seems to be a problem only occuring in WP8 ("PhoneVersion `Mango`").
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    2. COCan you determine on which picture it occurs, e.g. using a debugger?
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    3. COOh, and try to determine the InnerException by running in debug mode, stop when the error occurs and inspect the exception.
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