This method checks for the existence of a particular set of nodes identified by the XPath expression in the XML data represented by the current OracleXmlType instance using a string parameter for namespace resolution.

Declaration

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

Parameters

• xpathExpr

  The XPath expression.

• nsMap

  The string parameter used for namespace resolution of the XPath expression. nsMap has zero or more namespaces separated by spaces. nsMap 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.