public OperationStatus(OperationStatusFlag flag, string reason)
{
Contract.ThrowIfTrue(flag.Succeeded() && flag.HasBestEffort());
Flag = flag;
Reasons = reason == null?SpecializedCollections.EmptyEnumerable <string>() : SpecializedCollections.SingletonEnumerable(reason);
}
private OperationStatus(OperationStatusFlag flag, IEnumerable <string> reasons)
{
Contract.ThrowIfNull(reasons);
Contract.ThrowIfTrue(flag.Succeeded() && flag.HasBestEffort());
Flag = flag;
Reasons = reasons;
}