public static Task <bool> IsKnownFolderFileExistsAsync(
KnownFolderId knownFolderId,
string fileName)
{
StorageFolder workingFolder = StorageFileHelper.GetFolderFromKnownFolderId(knownFolderId);
return(workingFolder.IsFileExistsAsync(fileName));
}
/// <summary>
/// Return a stream to a specified file from the application local cache folder.
/// </summary>
/// <param name="knownFolderId">The well known folder ID to use</param>
/// <param name="fileName">Relative name of the file to open. Can contains subfolders.</param>
/// <param name="accessMode">File access mode. Default is read.</param>
/// <returns>File stream</returns>
public static Task <IRandomAccessStream> GetKnowFoldersFileStreamAsync(
KnownFolderId knownFolderId,
string fileName,
FileAccessMode accessMode = FileAccessMode.Read)
{
StorageFolder workingFolder = StorageFileHelper.GetFolderFromKnownFolderId(knownFolderId);
return(GetFileStreamAsync(fileName, accessMode, workingFolder));
}