/// <summary>
/// Gets the state set object for the tag.
/// </summary>
/// <param name="identity">The identity of the calling user.</param>
/// <param name="cancellationToken">The cancellation token for the request.</param>
/// <returns>
/// A task that will return the state set object.
/// </returns>
private async Task <StateSet> GetStateSet(ClaimsPrincipal identity, CancellationToken cancellationToken)
{
_historian.ThrowIfDisposed();
if (DataType != TagDataType.State)
{
return(null);
}
if (String.IsNullOrWhiteSpace(StateSet))
{
throw new InvalidOperationException(Resources.Error_StateSetNameIsRequired);
}
return(await Historian.GetStateSet(identity, StateSet, cancellationToken).ConfigureAwait(false));
}