This method checks the existence of a particular set of nodes identified by the XPath expression in the XML document represented by the current OracleXmlType instance using a .NET XmlNameSpaceManager object for namespace resolution.

Declaration

// C#
public bool IsExists(string xpathExpr, XmlNameSpaceManager nsMgr);

Parameters

• xpathExpr

  The XPath expression.

• nsMgr

  The .NET XmlNameSpaceManager object used for namespace resolution of the XPath expression. nsMgr can be null.

Return Value

Returns true if the required set of nodes exists; otherwise, returns false.

Exceptions

ObjectDisposedException - The object is already disposed.

ArgumentNullException - The xpathExpr is null or zero-length.

InvalidOperationException - The OracleConnection is not open or has been closed during the lifetime of the object.

Remarks

The default namespace is ignored if its value is an empty string.