'宣言 Public Overloads Function Descendants( _ ByVal span As TextSpan, _ Optional ByVal descendIntoChildrenFilter As Func(Of SyntaxNode,Boolean), _ Optional ByVal descendIntoIgnoredContent As Boolean _ ) As IEnumerable(Of SyntaxNode)
public IEnumerable<SyntaxNode> Descendants( TextSpan span, Func<SyntaxNode,bool> descendIntoChildrenFilter, bool descendIntoIgnoredContent )