/// <summary>
/// Gets unique file name in the folder
/// </summary>
/// <param name="folder"></param>
/// <param name="name"></param>
/// <returns></returns>
public async static Task <string> GetUniqueFileNameAsync(this ILocalFolder folder, string name = null)
{
if (name == null)
{
name = XTools.StringExtensions.GetRandomString(20);
}
int numberToAppend = 0;
var file = await folder.TryGetItemAsync(name);
if (file == null)
{
return(name);
}
var nameUnique = name;
do
{
numberToAppend++;
nameUnique = string.Format("{0} ({1}){2}", Path.GetFileNameWithoutExtension(name), numberToAppend, Path.GetExtension(name));
}while (await folder.TryGetItemAsync(nameUnique) != null); // as long as nameUnique named file exists
return(nameUnique);
}
/// <summary>
/// Opening existing storage file, or creating new if does not exist
/// </summary>
/// <param name="folder"></param>
/// <param name="name"></param>
/// <returns></returns>
public async static Task <ILocalFile> OpenOrCreateAsync(this ILocalFolder folder, string name)
{
var exists = await folder.TryGetItemAsync(name); // check whether the file exists
if (exists != null)
{
return(await folder.GetFileAsync(name));
}
return(await folder.CreateFileAsync(name));
}
public static async Task <ILocalFile> TryGetItemAsync(this ILocalFolder folder, string name)
{
var files = await folder.GetFilesAsync().ConfigureAwait(false);
return(files.FirstOrDefault(p => p.Name == name));
}