public async Task CopyFileAsync(
string sourcePath,
string targetPath,
CancellationToken cancellationToken = default(CancellationToken))
{
var sourceFile = _share.GetFileReference(sourcePath);
var targetFile = _share.GetFileReference(targetPath);
// Ensure that the target directory exists, used if we're copying a
// file to a new sub-directory.
await EnsureParentDirectoriesExistAsync(targetFile, cancellationToken);
// The following only initiates a copy. There does not appear a way
// to wait until the copy is complete without monitoring the copy
// status of the target file.
await targetFile.StartCopyAsync(sourceFile);
// However, for a file copy operation within the same storage
// account, we can assume that the copy operation has completed
// when `StartCopyAsync` completes. Here we check this assumption.
if (targetFile.CopyState.Status != CopyStatus.Success)
{
// TODO Consider if we can handle this case better.
throw new NotSupportedException();
}
}