XmlQuery Example

   
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using System.Xml;

class Form1 : Form {
    private XmlDocument mDocument;
    private XmlNode mCurrentNode;

    public Form1() {
        InitializeComponent();

        mDocument = new XmlDocument();
        mDocument.Load("XPathQuery.xml");
        mCurrentNode = mDocument.DocumentElement;
        ClearListBox();
    }

    private void DisplayList(XmlNodeList nodeList) {
        foreach (XmlNode node in nodeList) {
            RecurseXmlDocumentNoSiblings(node, 0);
        }
    }

    private void RecurseXmlDocumentNoSiblings(XmlNode root, int indent) {
        if (root == null)
            return;

        if (root is XmlElement) {
            listBoxResult.Items.Add(root.Name.PadLeft(root.Name.Length + indent));

            if (root.HasChildNodes)
                RecurseXmlDocument(root.FirstChild, indent + 2);
        } else if (root is XmlText) {
            string text = ((XmlText)root).Value;
            listBoxResult.Items.Add(text.PadLeft(text.Length + indent));
        } else if (root is XmlComment) {
            string text = root.Value;
            listBoxResult.Items.Add(text.PadLeft(text.Length + indent));

            if (root.HasChildNodes)
                RecurseXmlDocument(root.FirstChild, indent + 2);
        }
    }

    private void RecurseXmlDocument(XmlNode root, int indent) {
        if (root == null)
            return;
        if (root is XmlElement) {
            listBoxResult.Items.Add(root.Name.PadLeft(root.Name.Length + indent));
            if (root.HasChildNodes)
                RecurseXmlDocument(root.FirstChild, indent + 2);
            if (root.NextSibling != null)
                RecurseXmlDocument(root.NextSibling, indent);
        } else if (root is XmlText) {
            string text = ((XmlText)root).Value;
            listBoxResult.Items.Add(text.PadLeft(text.Length + indent));
        } else if (root is XmlComment) {
            string text = root.Value;
            listBoxResult.Items.Add(text.PadLeft(text.Length + indent));
            if (root.HasChildNodes)
                RecurseXmlDocument(root.FirstChild, indent + 2);
            if (root.NextSibling != null)
                RecurseXmlDocument(root.NextSibling, indent);
        }
    }

    private void ClearListBox() {
        listBoxResult.Items.Clear();
    }
    private void radioButtonSelectRoot_CheckedChanged(object sender, EventArgs e) {
        mCurrentNode = mCurrentNode.SelectSingleNode("//books");
        ClearListBox();
        RecurseXmlDocument(mCurrentNode, 0);
    }

    private void buttonClose_Click(object sender, EventArgs e) {
        Application.Exit();
    }

    private void buttonExecute_Click(object sender, EventArgs e) {
        if (textBoxQuery.Text == "")
            return;
        try {
            XmlNodeList nodeList = mCurrentNode.SelectNodes(textBoxQuery.Text);
            ClearListBox();
            DisplayList(nodeList);
        } catch (System.Exception err) {
            MessageBox.Show(err.Message);
        }
    }

    private void radioButtonSelectAllAuthors_CheckedChanged(object sender, EventArgs e) {
        XmlNodeList nodeList = mCurrentNode.SelectNodes("//book/author");
        ClearListBox();
        DisplayList(nodeList);
    }

    private void radioButtonSelectSpecificAuthor_CheckedChanged(object sender, EventArgs e) {
        XmlNodeList nodeList = mCurrentNode.SelectNodes("//book[author='J']");
        ClearListBox();
        DisplayList(nodeList);
    }

    private void radioButtonSelectAllBooks_CheckedChanged(object sender, EventArgs e) {
        XmlNodeList nodeList = mCurrentNode.SelectNodes("//book");
        ClearListBox();
        DisplayList(nodeList);
    }

    private void radioButtonSetBookAsCurrent_CheckedChanged(object sender, EventArgs e) {
        mCurrentNode = mCurrentNode.SelectSingleNode("book[title='C#']");
        ClearListBox();
        RecurseXmlDocumentNoSiblings(mCurrentNode, 0);
    }

    private void radioButtonSetBooksAsCurrent_CheckedChanged(object sender, EventArgs e) {
        mCurrentNode = mCurrentNode.SelectSingleNode("//books");
        ClearListBox();
        RecurseXmlDocumentNoSiblings(mCurrentNode, 0);
    }

    private void radioButtonSelectAllChildren_CheckedChanged(object sender, EventArgs e) {
        XmlNodeList nodeList = mCurrentNode.SelectNodes("*");
        ClearListBox();
        DisplayList(nodeList);
    }
    private void InitializeComponent() {
        this.radioButtonSelectRoot = new System.Windows.Forms.RadioButton();
        this.radioButtonSelectAllChildren = new System.Windows.Forms.RadioButton();
        this.radioButtonSetBooksAsCurrent = new System.Windows.Forms.RadioButton();
        this.radioButtonSetBookAsCurrent = new System.Windows.Forms.RadioButton();
        this.radioButtonSelectAllBooks = new System.Windows.Forms.RadioButton();
        this.radioButtonSelectSpecificAuthor = new System.Windows.Forms.RadioButton();
        this.radioButtonSelectAllAuthors = new System.Windows.Forms.RadioButton();
        this.textBoxQuery = new System.Windows.Forms.TextBox();
        this.buttonExecute = new System.Windows.Forms.Button();
        this.buttonClose = new System.Windows.Forms.Button();
        this.listBoxResult = new System.Windows.Forms.ListBox();
        this.SuspendLayout();
        this.radioButtonSelectRoot.AutoSize = true;
        this.radioButtonSelectRoot.Location = new System.Drawing.Point(13, 234);
        this.radioButtonSelectRoot.Size = new System.Drawing.Size(72, 17);
        this.radioButtonSelectRoot.Text = "Select root";
        this.radioButtonSelectRoot.CheckedChanged += new System.EventHandler(this.radioButtonSelectRoot_CheckedChanged);

        this.radioButtonSelectAllChildren.AutoSize = true;
        this.radioButtonSelectAllChildren.Location = new System.Drawing.Point(163, 282);
        this.radioButtonSelectAllChildren.Size = new System.Drawing.Size(104, 17);
        this.radioButtonSelectAllChildren.Text = "Select all children";
        this.radioButtonSelectAllChildren.CheckedChanged += new System.EventHandler(this.radioButtonSelectAllChildren_CheckedChanged);

        this.radioButtonSetBooksAsCurrent.AutoSize = true;
        this.radioButtonSetBooksAsCurrent.Location = new System.Drawing.Point(163, 258);
        this.radioButtonSetBooksAsCurrent.Size = new System.Drawing.Size(120, 17);
        this.radioButtonSetBooksAsCurrent.Text = "Set Books as current";
        this.radioButtonSetBooksAsCurrent.CheckedChanged += new System.EventHandler(this.radioButtonSetBooksAsCurrent_CheckedChanged);

        this.radioButtonSetBookAsCurrent.AutoSize = true;
        this.radioButtonSetBookAsCurrent.Location = new System.Drawing.Point(163, 234);
        this.radioButtonSetBookAsCurrent.Size = new System.Drawing.Size(115, 17);
        this.radioButtonSetBookAsCurrent.Text = "Set Book as current";
        this.radioButtonSetBookAsCurrent.CheckedChanged += new System.EventHandler(this.radioButtonSetBookAsCurrent_CheckedChanged);

        this.radioButtonSelectAllBooks.AutoSize = true;
        this.radioButtonSelectAllBooks.Location = new System.Drawing.Point(13, 306);
        this.radioButtonSelectAllBooks.Size = new System.Drawing.Size(96, 17);
        this.radioButtonSelectAllBooks.Text = "Select all books";
        this.radioButtonSelectAllBooks.CheckedChanged += new System.EventHandler(this.radioButtonSelectAllBooks_CheckedChanged);

        this.radioButtonSelectSpecificAuthor.AutoSize = true;
        this.radioButtonSelectSpecificAuthor.Location = new System.Drawing.Point(13, 282);
        this.radioButtonSelectSpecificAuthor.Size = new System.Drawing.Size(137, 17);
        this.radioButtonSelectSpecificAuthor.Text = "Select by specific author";
        this.radioButtonSelectSpecificAuthor.CheckedChanged += new System.EventHandler(this.radioButtonSelectSpecificAuthor_CheckedChanged);

        this.radioButtonSelectAllAuthors.AutoSize = true;
        this.radioButtonSelectAllAuthors.Location = new System.Drawing.Point(13, 258);
        this.radioButtonSelectAllAuthors.Margin = new System.Windows.Forms.Padding(3, 1, 3, 3);
        this.radioButtonSelectAllAuthors.Size = new System.Drawing.Size(102, 17);
        this.radioButtonSelectAllAuthors.Text = "Select all authors";
        this.radioButtonSelectAllAuthors.CheckedChanged += new System.EventHandler(this.radioButtonSelectAllAuthors_CheckedChanged);

        this.textBoxQuery.Location = new System.Drawing.Point(13, 330);
        this.textBoxQuery.Size = new System.Drawing.Size(385, 20);

        this.buttonExecute.Location = new System.Drawing.Point(323, 234);
        this.buttonExecute.Text = "Execute";
        this.buttonExecute.Click += new System.EventHandler(this.buttonExecute_Click);

        this.buttonClose.Location = new System.Drawing.Point(405, 13);
        this.buttonClose.Text = "Close";
        this.buttonClose.Click += new System.EventHandler(this.buttonClose_Click);

        this.listBoxResult.FormattingEnabled = true;
        this.listBoxResult.Location = new System.Drawing.Point(13, 13);
        this.listBoxResult.Size = new System.Drawing.Size(385, 212);

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(492, 362);
        this.Controls.Add(this.listBoxResult);
        this.Controls.Add(this.buttonClose);
        this.Controls.Add(this.buttonExecute);
        this.Controls.Add(this.textBoxQuery);
        this.Controls.Add(this.radioButtonSelectAllAuthors);
        this.Controls.Add(this.radioButtonSelectSpecificAuthor);
        this.Controls.Add(this.radioButtonSelectAllBooks);
        this.Controls.Add(this.radioButtonSetBookAsCurrent);
        this.Controls.Add(this.radioButtonSetBooksAsCurrent);
        this.Controls.Add(this.radioButtonSelectAllChildren);
        this.Controls.Add(this.radioButtonSelectRoot);

        this.Text = "XPath Queries";
        this.ResumeLayout(false);
        this.PerformLayout();

    }



    private System.Windows.Forms.RadioButton radioButtonSelectRoot;
    private System.Windows.Forms.RadioButton radioButtonSelectAllChildren;
    private System.Windows.Forms.RadioButton radioButtonSetBooksAsCurrent;
    private System.Windows.Forms.RadioButton radioButtonSetBookAsCurrent;
    private System.Windows.Forms.RadioButton radioButtonSelectAllBooks;
    private System.Windows.Forms.RadioButton radioButtonSelectSpecificAuthor;
    private System.Windows.Forms.RadioButton radioButtonSelectAllAuthors;
    private System.Windows.Forms.TextBox textBoxQuery;
    private System.Windows.Forms.Button buttonExecute;
    private System.Windows.Forms.Button buttonClose;
    private System.Windows.Forms.ListBox listBoxResult;
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }

}



           
         
     


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