IXPathExpression.Evaluate

IXPathExpression.Evaluate method

Evaluates this XPath expression and returns a result.

public IXPathResult Evaluate(Node contextNode, XPathResultType type, object result)

Parameter	Type	Description
contextNode	Node	The `context` is context node for the evaluation of this XPath expression. If the `IXPathEvaluator` was obtained by casting the `Document` then this must be owned by the same document and must be a `Document`, `Element`, `Attr`, `Text`, `CDATASection`, `Comment`, `ProcessingInstruction`, or XPathNamespace node. If the context node is a `Text` or a `CDATASection`, then the context is interpreted as the whole logical text node as seen by XPath, unless the node is empty in which case it may not serve as the XPath context.
type	XPathResultType	If a specific `type` is specified, then the result will be coerced to return the specified type relying on XPath conversions and fail if the desired coercion is not possible. This must be one of the values of `XPathResultType`.
result	Object	The `result` specifies a specific result object which may be reused and returned by this method. If this is specified as `null` or the implementation does not reuse the specified result, a new result object will be constructed and returned. For XPath 1.0 results, this object will be of type `IXPathResult`.

The result of the evaluation of the XPath expression. For XPath 1.0 results, this object will be of type IXPathResult.

exception	condition
DOMException	TYPE_ERR: Raised if the result cannot be converted to return the specified type.
DOMException	WRONG_DOCUMENT_ERR: The Node is from a document that is not supported by the `IXPathEvaluator` that created this `IXPathExpression`.
DOMException	NOT_SUPPORTED_ERR: The Node is not a type permitted as an XPath context node or the request type is not permitted by this `IXPathExpression`.