/// <summary>
/// Creates a file in this folder
/// </summary>
/// <param name="desiredName">The name of the file to create</param>
/// <param name="option">Specifies how to behave if the specified file already exists</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The newly created file</returns>
public async Task<IFile> CreateFileAsync(string desiredName, CreationCollisionOption option, CancellationToken cancellationToken)
{
Requires.NotNullOrEmpty(desiredName, "desiredName");
await AwaitExtensions.SwitchOffMainThreadAsync(cancellationToken);
EnsureExists();
string nameToUse = desiredName;
string newPath = System.IO.Path.Combine(Path, nameToUse);
if (File.Exists(newPath))
{
if (option == CreationCollisionOption.GenerateUniqueName)
{
string desiredRoot = System.IO.Path.GetFileNameWithoutExtension(desiredName);
string desiredExtension = System.IO.Path.GetExtension(desiredName);
for (int num = 2; File.Exists(newPath); num++)
{
cancellationToken.ThrowIfCancellationRequested();
nameToUse = desiredRoot + " (" + num + ")" + desiredExtension;
newPath = System.IO.Path.Combine(Path, nameToUse);
}
InternalCreateFile(newPath);
}
else if (option == CreationCollisionOption.ReplaceExisting)
{
File.Delete(newPath);
InternalCreateFile(newPath);
}
else if (option == CreationCollisionOption.FailIfExists)
{
throw new IOException("File already exists: " + newPath);
}
else if (option == CreationCollisionOption.OpenIfExists)
{
// No operation
}
else
{
throw new ArgumentException("Unrecognized CreationCollisionOption: " + option);
}
}
else
{
// Create file
InternalCreateFile(newPath);
}
var ret = new FileSystemFile(newPath);
return ret;
}
/// <summary>
/// Gets a file in this folder
/// </summary>
/// <param name="name">The name of the file to get</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The requested file, or null if it does not exist</returns>
public async Task<IFile> GetFileAsync(string name, CancellationToken cancellationToken)
{
await AwaitExtensions.SwitchOffMainThreadAsync(cancellationToken);
string path = System.IO.Path.Combine(Path, name);
if (!File.Exists(path))
{
throw new PCLStorage.Exceptions.FileNotFoundException("File does not exist: " + path);
}
var ret = new FileSystemFile(path);
return ret;
}