/// <summary>
/// Retrieves an adjusted thumbnail image for the file, determined by the purpose of the thumbnail.
/// </summary>
/// <param name="mode">The enum value that describes the purpose of the thumbnail and determines how the thumbnail image is adjusted.</param>
/// <returns>When this method completes successfully, it returns a <see cref="StorageItemThumbnail"/> that represents the thumbnail image or null if there is no thumbnail image associated with the file.</returns>
public Task <StorageItemThumbnail> GetThumbnailAsync(ThumbnailMode mode)
{
#if WINDOWS_UWP || WINDOWS_APP || WINDOWS_PHONE_APP || WINDOWS_PHONE
return(Task.Run <StorageItemThumbnail>(async() =>
{
return await _file.GetThumbnailAsync((Windows.Storage.FileProperties.ThumbnailMode)mode);
}));
#else
if (ContentType.StartsWith("video"))
{
return(StorageItemThumbnail.CreateVideoThumbnailAsync(this));
}
else if (ContentType.StartsWith("image"))
{
return(StorageItemThumbnail.CreatePhotoThumbnailAsync(this));
}
return(Task.FromResult <StorageItemThumbnail>(null));
#endif
}
/// <summary>
/// Attaches files. Let´s the user choose file(s) to attach to the mail
/// </summary>
public async void AttachFile()
{
var picker = new Windows.Storage.Pickers.FileOpenPicker();
picker.ViewMode = Windows.Storage.Pickers.PickerViewMode.List;
picker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.Desktop;
picker.FileTypeFilter.Add("*");
Windows.Storage.StorageFile file = await picker.PickSingleFileAsync();
//Checks if the file has already been added
foreach (var tempFile in FileList)
{
if (tempFile.FileName.Equals(file.Name))
{
DisplayDialog("Error attaching file", "This file has already been attached! Try again!");
return;
}
}
if (file != null)
{
//For use when sending the mail (adds file to the list of attached files)
byte[] byteArray = await HelperUtils.GetBytesAsync(file);
MailHandler.attachedFiles.Add(file.Name, byteArray);
//Adds AttachedFile for displaying in the GridView
FileList.Add(new AttachedFile
{
FileName = file.Name,
Thumbnail = await file.GetThumbnailAsync(ThumbnailMode.ListView)
});
txtAttachedFiles.Text = "Attached files:";
}
}