/// <summary>
/// Tries to get the file or folder with the specified name from the current folder.
/// Returns null instead of raising a FileNotFoundException if the specified file or folder is not found.
/// </summary>
/// <param name="name">The name (or path relative to the current folder) of the file or folder to get.</param>
/// <returns>When this method completes successfully, it returns an IStorageItem that represents the specified file or folder.
/// If the specified file or folder is not found, this method returns null instead of raising an exception.</returns>
public Task <IStorageItem> TryGetItemAsync(string name)
{
#if WINDOWS_UWP || WINDOWS_APP
return(Task.Run <IStorageItem>(async() =>
{
var i = await _folder.TryGetItemAsync(name);
if (i == null)
{
return null;
}
if (i.IsOfType(Windows.Storage.StorageItemTypes.File))
{
return (StorageFile)((Windows.Storage.StorageFile)i);
}
else
{
return (StorageFolder)((Windows.Storage.StorageFolder)i);
}
}));
#elif WINDOWS_PHONE_APP
return(Task.Run <IStorageItem>(async() =>
{
if (name.Contains("."))
{
// names containing a . are files so do this faster files-only approach
foreach (var file in await _folder.GetFilesAsync())
{
if (file.Name == name)
{
return (StorageFile)((Windows.Storage.StorageFile)file);
}
}
}
else
{
// items with no extension could be either file or folder so check all items
foreach (Windows.Storage.IStorageItem item in await _folder.GetItemsAsync())
{
if (item.Name == name)
{
if (item.IsOfType(Windows.Storage.StorageItemTypes.File))
{
return (StorageFile)((Windows.Storage.StorageFile)item);
}
else
{
return (StorageFolder)((Windows.Storage.StorageFolder)item);
}
}
}
}
return null;
}));
#elif WINDOWS_PHONE
return(Task.Run <IStorageItem>(async() =>
{
string isoPath = _folder.GetIsoStorePath();
if (isoPath == null)
{
// On 8.1 defer to try/catch if outside of localstate/isostore
try
{
var i = await _folder.GetItemAsync(name);
if (i.IsOfType(Windows.Storage.StorageItemTypes.File))
{
return (StorageFile)((Windows.Storage.StorageFile)i);
}
else
{
return (StorageFolder)((Windows.Storage.StorageFolder)i);
}
}
catch
{
return null;
}
}
if (name.Contains("."))
{
// file
if (IsolatedStorageFile.GetUserStoreForApplication().FileExists(global::System.IO.Path.Combine(isoPath, name)))
{
return (StorageFile)((Windows.Storage.StorageFile) await _folder.GetFileAsync(name));
}
}
else
{
// folder
if (IsolatedStorageFile.GetUserStoreForApplication().DirectoryExists(global::System.IO.Path.Combine(isoPath, name)))
{
return (StorageFolder)((Windows.Storage.StorageFolder) await _folder.GetFolderAsync(name));
}
else if (IsolatedStorageFile.GetUserStoreForApplication().FileExists(global::System.IO.Path.Combine(isoPath, name)))
{
// file without extension
return (StorageFile)((Windows.Storage.StorageFile) await _folder.GetFileAsync(name));
}
}
return null;
}));
#elif __ANDROID__ || __UNIFIED__ || WIN32 || TIZEN
return(Task.Run <IStorageItem>(() =>
{
string itempath = global::System.IO.Path.Combine(Path, name);
if (File.Exists(itempath))
{
return new StorageFile(itempath);
}
else if (Directory.Exists(itempath))
{
return new StorageFolder(itempath);
}
return null;
}));
#else
throw new PlatformNotSupportedException();
#endif
}
