// 按照指定方式获取父类群。
public static IReadOnlyList <Taxon> GetParents(this Taxon taxon, GetParentsOption option)
{
if (taxon is null)
{
throw new ArgumentNullException();
}
//
List <Taxon> result = new List <Taxon>();
if (!taxon.IsRoot)
{
if (option == GetParentsOption.EditMode)
{
// 上溯到任何具名分类阶元类群，保留任何类群
result.AddRange(taxon.GetParents(
TaxonFilter.Any,
TaxonFilter.Named | TaxonFilter.AnyRank,
includeTermination: true,
skipParaphyly: false));
// 如果没有上溯到任何主要分类阶元类群，直接上溯到顶级类群，保留任何类群
if (result.Count <= 0)
{
result.AddRange(taxon.GetParents(
TaxonFilter.Any,
TaxonFilter.None,
includeTermination: true,
skipParaphyly: false));
}
}
else if (option == GetParentsOption.Least)
{
// 首先上溯到任何具名类群，保留任何具名类群，不跳过并系群
result.AddRange(taxon.GetParents(
TaxonFilter.Named | TaxonFilter.AnyRank,
TaxonFilter.Named | TaxonFilter.AnyRank,
includeTermination: true,
skipParaphyly: false));
// 如果上溯到任何未指定分级类群或演化支类群，继续上溯到任何主要或次要分类阶元类群，保留任何具名类群，跳过并系群
if (result.Count > 0)
{
Taxon parent = result[^ 1];
// 更新父类群。
private void _UpdateParents()
{
Taxon currentTaxon = Common.CurrentTaxon;
if (currentTaxon.IsRoot)
{
taxonButtonGroup_Parents.Clear();
}
else
{
List <Taxon> parents = new List <Taxon>(currentTaxon.GetParents(_GetParentsOption));
if (parents.Count > 0)
{
parents.Reverse();
}
parents.Add(currentTaxon);
Common.UpdateTaxonListAndGroupByRank(taxonButtonGroup_Parents, parents);
}
}