/// <summary>
/// Adds or replaces a digital twin.
/// Status codes:
/// 200 (OK): Success.
/// 400 (Bad Request): The request is invalid.
/// 412 (Precondition Failed): The model is decommissioned or the digital twin
/// already exists (when using If-None-Match: *).
/// </summary>
/// <param name='operations'>
/// The operations group for this extension method.
/// </param>
/// <param name='id'>
/// The id of the digital twin. The id is unique within the service and case
/// sensitive.
/// </param>
/// <param name='twin'>
/// The digital twin instance being added. If provided, the $dtId property is
/// ignored.
/// </param>
/// <param name='ifNoneMatch'>
/// Only perform the operation if the entity does not already exist. Possible
/// values include: '*'
/// </param>
public static object Add(this IDigitalTwinsOperations operations, string id, object twin, string ifNoneMatch = default(string))
{
return(operations.AddAsync(id, twin, ifNoneMatch).GetAwaiter().GetResult());
}