/// <summary>
/// Evaluates the XPath expression and returns the typed result.
/// </summary>
/// <param name="xpath">A string representing an XPath expression that can be evaluated.</param>
/// <returns></returns>
public object SelectXmlNodes(string xpath)
{
object retval = null;
// get the selected node
XPathNavigatorTreeNode node = this.SelectedNode as XPathNavigatorTreeNode;
// if there is no selected node, default to the root node
if (node == null && this.Nodes.Count > 0)
{
node = this.GetRootXmlTreeNode();
}
if (node == null)
{
return(null);
}
try
{
XPathExpression xpe = node.Navigator.Compile(xpath);
retval = node.Navigator.Evaluate(xpe);
}
catch (Exception ex)
{
ExpressionResultsWindow dialog = new ExpressionResultsWindow();
dialog.Expression = xpath;
dialog.Result = ex.Message;
dialog.ShowDialog(this.FindForm());
logger.Error(SQLSchemaTool.ERRORFORMAT, ex.Message, ex.Source, ex.StackTrace);
}
// evaluate the expression, return the result
return(retval);
}
/// <summary>
/// Finds and selects an XPathNavigatorTreeNode using an XPath expression.
/// </summary>
/// <param name="xpath">An XPath expression.</param>
/// <returns></returns>
public bool FindByXpath(string xpath)
{
// evaluate the expression
object result = this.SelectXmlNodes(xpath);
if (result == null)
{
return(false);
}
// did the expression evaluate to a node set?
XPathNodeIterator iterator = result as XPathNodeIterator;
if (iterator != null)
{
// the expression evaluated to a node set
if (iterator == null || iterator.Count < 1)
{
return(false);
}
if (!iterator.MoveNext())
{
return(false);
}
// select the first node in the set
return(this.SelectXmlTreeNode(iterator.Current));
}
else
{
// the expression evaluated to something else, most likely a count()
// show the result in a new window
ExpressionResultsWindow dialog = new ExpressionResultsWindow();
dialog.Expression = xpath;
dialog.Result = result.ToString();
dialog.ShowDialog(this.FindForm());
return(true);
}
}
/// <summary>
/// Finds and selects an XPathNavigatorTreeNode using an XPath expression.
/// </summary>
/// <param name="xpath">An XPath expression.</param>
/// <returns></returns>
public bool FindByXpath(string xpath)
{
// evaluate the expression
object result = this.SelectXmlNodes(xpath);
if (result == null)
return false;
// did the expression evaluate to a node set?
XPathNodeIterator iterator = result as XPathNodeIterator;
if (iterator != null)
{
// the expression evaluated to a node set
if (iterator == null || iterator.Count < 1)
return false;
if (!iterator.MoveNext())
return false;
// select the first node in the set
return this.SelectXmlTreeNode(iterator.Current);
}
else
{
// the expression evaluated to something else, most likely a count()
// show the result in a new window
ExpressionResultsWindow dialog = new ExpressionResultsWindow();
dialog.Expression = xpath;
dialog.Result = result.ToString();
dialog.ShowDialog(this.FindForm());
return true;
}
}
/// <summary>
/// Evaluates the XPath expression and returns the typed result.
/// </summary>
/// <param name="xpath">A string representing an XPath expression that can be evaluated.</param>
/// <returns></returns>
public object SelectXmlNodes(string xpath)
{
object retval = null;
// get the selected node
XPathNavigatorTreeNode node = this.SelectedNode as XPathNavigatorTreeNode;
// if there is no selected node, default to the root node
if (node == null && this.Nodes.Count > 0)
node = this.GetRootXmlTreeNode();
if (node == null)
return null;
try
{
XPathExpression xpe = node.Navigator.Compile(xpath);
retval = node.Navigator.Evaluate(xpe);
}
catch(Exception ex)
{
ExpressionResultsWindow dialog = new ExpressionResultsWindow();
dialog.Expression = xpath;
dialog.Result = ex.Message;
dialog.ShowDialog(this.FindForm());
logger.Error(SQLSchemaTool.ERRORFORMAT, ex.Message, ex.Source, ex.StackTrace);
}
// evaluate the expression, return the result
return retval;
}