The method getSnapshotLength cannot be called on the XPathResult of XPath expression '{0}' because its XPathResultType is {1}. This method applies only to types UNORDERED_NODE_SNAPSHOT_TYPE and ORDERED_NODE_SNAPSHOT_TYPE.

XPathResultTypeが{1}のため，getSnapshotLengthメソッドはXPath式{0}のXPathResultに呼び出すことができません。このメソッドは，UNORDERED_NODE_SNAPSHOT_TYPE型およびORDERED_NODE_SNAPSHOT_TYPE型だけに適用します。