public static async Task <string> CreateTempFileNameAsync(
this StorageFolder folder,
string extension = ".tmp",
string prefix = "",
string suffix = "")
{
string fileName;
if (folder == null)
{
folder = ApplicationData.Current.TemporaryFolder;
}
if (string.IsNullOrEmpty(extension))
{
extension = ".tmp";
}
else if (extension[0] != '.')
{
extension = string.Format(".{0}", extension);
}
// Try no random numbers
if (!string.IsNullOrEmpty(prefix) &&
!string.IsNullOrEmpty(prefix))
{
fileName = string.Format(
"{0}{1}{2}",
prefix,
suffix,
extension);
if (!await folder.CheckFileExistedAsync(fileName))
{
return(fileName);
}
}
do
{
fileName = string.Format(
"{0}{1}{2}{3}",
prefix,
Guid.NewGuid(),
suffix,
extension);
} while (await folder.CheckFileExistedAsync(fileName));
return(fileName);
}
/// <summary>
/// Loads a BitmapImage asynchronously given a specific folder and file name.
/// </summary>
/// <param name="folder">The folder.</param>
/// <param name="fileName">Name of the file.</param>
/// <returns></returns>
public static async Task <BitmapImage> LoadAsync(this BitmapImage bitmap, StorageFolder folder, string fileName)
{
try
{
if (await folder.CheckFileExistedAsync(fileName))
{
var file = await folder.GetFileByPathAsync(fileName);
return(await bitmap.SetSourceAsync(file));
}
else
{
return(null);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.StackTrace);
return(null);
}
}
